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Ozone layer
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Ozone-oxygen cycle in the ozone layer.
The ozone layer or ozone shield is a region of Earth's stratosphere that absorbs most of the Sun's ultraviolet radiation. It contains high concentrations of ozone (O3) in relation to other parts of the atmosphere, although still small in relation to other gases in the stratosphere. The ozone layer contains less than 10 parts per million of ozone, while the average ozone concentration in Earth's atmosphere as a whole is about 0.3 parts per million. The ozone layer is mainly found in the lower portion of the stratosphere, from approximately 20 to 30 kilometers (12 to 19 mi) above Earth, although its thickness varies seasonally and geographically.[1]
The ozone layer was discovered in 1913 by the French physicists Charles Fabry and Henri Buisson. Measurements of the sun showed that the radiation sent out from its surface and reaching the ground on Earth is usually consistent with the spectrum of a black body with a temperature in the range of 5,500–6,000 K (5,227 to 5,727 °C), except that there was no radiation below a wavelength of about 310 nm at the ultraviolet end of the spectrum. It was deduced that the missing radiation was being absorbed by something in the atmosphere. Eventually the spectrum of the missing radiation was matched to only one known chemical, ozone.[2] Its properties were explored in detail by the British meteorologist G. M. B. Dobson, who developed a simple spectrophotometer (the Dobsonmeter) that could be used to measure stratospheric ozone from the ground. Between 1928 and 1958, Dobson established a worldwide network of ozone monitoring stations, which continue to operate to this day. The "Dobson unit", a convenient measure of the amount of ozone overhead, is named in his honor.
The ozone layer absorbs 97 to 99 percent of the Sun's medium-frequency ultraviolet light (from about 200 nm to 315 nm wavelength), which otherwise would potentially damage exposed life forms near the surface.[3]
In 1976 atmospheric research revealed that the ozone layer was being depleted by chemicals released by industry, mainly chlorofluorocarbons (CFCs). Concerns that increased UV radiation due to ozone depletion threatened life on Earth led to bans on the chemicals, and the latest evidence is that ozone depletion has slowed or stopped. The United Nations General Assembly has designated September 16 as the International Day for the Preservation of the Ozone Layer.
Venus also has a thin ozone layer at an altitude of 100 kilometers from the planet's surface.[4]
Contents
[hide]
1 Sources
2 Ultraviolet light
3 Distribution in the stratosphere
4 Depletion
4.1 Regulation
4.2 Implications for astronomy
5 See also
6 References
7 Further reading
8 External links
Sources[edit]
The photochemical mechanisms that give rise to the ozone layer were discovered by the British physicist Sydney Chapman in 1930. Ozone in the Earth's stratosphere is created by ultraviolet light striking ordinary oxygen molecules containing two oxygen atoms (O2), splitting them into individual oxygen atoms (atomic oxygen); the atomic oxygen then combines with unbroken O2 to create ozone, O3. The ozone molecule is unstable (although, in the stratosphere, long-lived) and when ultraviolet light hits ozone it splits into a molecule of O2 and an individual atom of oxygen, a continuing process called the ozone-oxygen cycle. Chemically, this can be described as:
O2 + ℎνuv → 2O
O + O2 ↔ O3
About 90 percent of the ozone in the atmosphere is contained in the stratosphere. Ozone concentrations are greatest between about 20 and 40 kilometres (66,000 and 131,000 ft), where they range from about 2 to 8 parts per million. If all of the ozone were compressed to the pressure of the air at sea level, it would be only 3 millimetres (1⁄8 inch) thick.[5]
Ultraviolet light[edit]
UV-B energy levels at several altitudes. Blue line shows DNA sensitivity. Red line shows surface energy level with 10 percent decrease in ozone
Levels of ozone at various altitudes and blocking of different bands of ultraviolet radiation. Essentially all UVC (100–280 nm) is blocked by dioxygen (from 100–200 nm) or else by ozone (200–280 nm) in the atmosphere. The shorter portion of the UV-C band and the more energetic UV above this band causes the formation of the ozone layer, when single oxygen atoms produced by UV photolysis of dioxygen (below 240 nm) react with more dioxygen. The ozone layer also blocks most, but not quite all, of the sunburn-producing UV-B (280–315 nm) band, which lies in the wavelengths longer than UV-C. The band of UV closest to visible light, UV-A (315–400 nm), is hardly affected by ozone, and most of it reaches the ground. UV-A does not primarily cause skin reddening, but there is evidence that it causes long-term skin damage.
Although the concentration of the ozone in the ozone layer is very small, it is vitally important to life because it absorbs biologically harmful ultraviolet (UV) radiation coming from the sun. Extremely short or vacuum UV (10–100 nm) is screened out by nitrogen. UV radiation capable of penetrating nitrogen is divided into three categories, based on its wavelength; these are referred to as UV-A (400–315 nm), UV-B (315–280 nm), and UV-C (280–100 nm).
UV-C, which is very harmful to all living things, is entirely screened out by a combination of dioxygen (< 200 nm) and ozone (> about 200 nm) by around 35 kilometres (115,000 ft) altitude. UV-B radiation can be harmful to the skin and is the main cause of sunburn; excessive exposure can also cause cataracts, immune system suppression, and genetic damage, resulting in problems such as skin cancer. The ozone layer (which absorbs from about 200 nm to 310 nm with a maximal absorption at about 250 nm)[6] is very effective at screening out UV-B; for radiation with a wavelength of 290 nm, the intensity at the top of the atmosphere is 350 million times stronger than at the Earth's surface. Nevertheless, some UV-B, particularly at its longest wavelengths, reaches the surface, and is important for the skin's production of vitamin D.
Ozone is transparent to most UV-A, so most of this longer-wavelength UV radiation reaches the surface, and it constitutes most of the UV reaching the Earth. This type of UV radiation is significantly less harmful to DNA, although it may still potentially cause physical damage, premature aging of the skin, indirect genetic damage, and skin cancer.[7]
Distribution in the stratosphere[edit]
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The thickness of the ozone layer—that is, the total amount of ozone in a column overhead—varies by a large factor worldwide, being in general smaller near the equator and larger towards the poles. It also varies with season, being in general thickest during the autumn and thinner during the early spring. The reasons for this latitude and seasonal dependence are complicated, which involve in atmospheric circulation patterns as well as solar intensity. But in general, bitterly cold temperatures mixed with sunlight assist in maximum ozone depletion, which occurs in early spring. [8]
Since stratospheric ozone is produced by solar UV radiation, one might expect to find the highest ozone levels over the tropics and the lowest over polar regions. The same argument would lead one to expect the highest ozone levels in the summer and the lowest in the winter. The observed behavior is very different: most of the ozone is found in the mid-to-high latitudes of the northern and southern hemispheres, and the highest levels are found in the spring, not summer, and the lowest in the autumn, not winter in the northern hemisphere. During winter, the ozone layer actually increases in depth. This puzzle is explained by the prevailing stratospheric wind patterns, known as the Brewer-Dobson circulation. While most of the ozone is indeed created over the tropics, the stratospheric circulation then transports it poleward and downward to the lower stratosphere of the high latitudes.[8] However, owing to the ozone hole phenomenon, the lowest amounts of column ozone found anywhere in the world are over the Antarctic in the southern spring period of September and October and to a lesser extent over the Arctic in the northern spring period of March, April, and May.
Brewer-Dobson circulation in the ozone layer.
The ozone layer is higher in altitude in the tropics, and lower in altitude outside the tropics, especially in the polar regions. This altitude variation of ozone results from the slow circulation that lifts the ozone-poor air out of the troposphere into the stratosphere. As this air slowly rises in the tropics, ozone is produced as the sun overhead photolyzes oxygen molecules. As this slow circulation levels off and flows towards the mid-latitudes, it carries the ozone-rich air from the tropical middle stratosphere to the lower stratosphere middle and high latitudes . The high ozone concentrations at high latitudes are due to the accumulation of ozone at lower altitudes.[8]
The Brewer-Dobson circulation moves very slowly. The time needed to lift an air parcel by 1 km in the lower tropical stratosphere is about 2 months (18 m per day).[9] However, horizontal poleward transport in the lower stratosphere is much faster and amounts to approximately 100 km per day in the northern hemisphere whilst it is only half as much in the southern hemisphere (~51 km per day).[10] Even though ozone in the lower tropical stratosphere is produced at a very slow rate, the lifting circulation is so slow that ozone can build up to relatively high levels by the time it reaches 26 kilometres (16 mi).[8]
Ozone amounts over the continental United States (25°N to 49°N) are highest in the northern spring (April and May). These ozone amounts fall over the course of the summer to their lowest amounts in October, and then rise again over the course of the winter.[11] Again, wind transport of ozone is principally responsible for the seasonal changes of these higher latitude ozone patterns.[8]
The total column amount of ozone generally increases as we move from the tropics to higher latitudes in both hemispheres. However, the overall column amounts are greater in the northern hemisphere high latitudes than in the southern hemisphere high latitudes. In addition, while the highest amounts of column ozone over the Arctic occur in the northern spring (March–April), the opposite is true over the Antarctic, where the lowest amounts of column ozone occur in the southern spring (September–October).[8]
Depletion[edit]
Main article: Ozone depletion
NASA projections of stratospheric ozone concentrations if chlorofluorocarbons had not been banned.
The ozone layer can be depleted by free radical catalysts, including nitric oxide (NO), nitrous oxide (N2O), hydroxyl (OH), atomic chlorine (Cl), and atomic bromine (Br). While there are natural sources for all of these species, the concentrations of chlorine and bromine increased markedly in recent decades because of the release of large quantities of man-made organohalogen compounds, especially chlorofluorocarbons (CFCs) and bromofluorocarbons.[12] These highly stable compounds are capable of surviving the rise to the stratosphere, where Cl and Br radicals are liberated by the action of ultraviolet light. Each radical is then free to initiate and catalyze a chain reaction capable of breaking down over 100,000 ozone molecules. By 2009, nitrous oxide was the largest ozone-depleting substance (ODS) emitted through human activities.[13]
Levels of atmospheric ozone measured by satellite show clear seasonal variations and appear to verify their decline over time.
The breakdown of ozone in the stratosphere results in reduced absorption of ultraviolet radiation. Consequently, unabsorbed and dangerous ultraviolet radiation is able to reach the Earth’s surface at a higher intensity. Ozone levels have dropped by a worldwide average of about 4 percent since the late 1970s. For approximately 5 percent of the Earth's surface, around the north and south poles, much larger seasonal declines have been seen, and are described as "ozone holes".[11] The discovery of the annual depletion of ozone above the Antarctic was first announced by Joe Farman, Brian Gardiner and Jonathan Shanklin, in a paper which appeared in Nature on May 16, 1985.[14]
Regulation[edit]
Main article: Ozone depletion and climate change
To support successful regulation attempts, the ozone case was communicated to lay persons "with easy-to-understand bridging metaphors derived from the popular culture" and related to "immediate risks with everyday relevance".[citation needed] The specific metaphors used in the discussion (ozone shield, ozone hole) proved quite useful[15] and, compared to global climate change, the ozone case was much more seen as a "hot issue" and imminent risk.[16] Lay people were cautious about a depletion of the ozone layer and the risks of skin cancer.
In 1978, the United States, Canada and Norway enacted bans on CFC-containing aerosol sprays that damage the ozone layer. The European Community rejected an analogous proposal to do the same. In the U.S., chlorofluorocarbons continued to be used in other applications, such as refrigeration and industrial cleaning, until after the discovery of the Antarctic ozone hole in 1985. After negotiation of an international treaty (the Montreal Protocol), CFC production was capped at 1986 levels with commitments to long-term reductions.[17] Since that time, the treaty was amended to ban CFC production after 1995 in the developed countries, and later in developing countries.[18] Today, all of the world's 197 countries have signed the treaty. Beginning January 1, 1996, only recycled and stockpiled CFCs were available for use in developed countries like the US. This production phaseout was possible because of efforts to ensure that there would be substitute chemicals and technologies for all ODS uses.[19]
On August 2, 2003, scientists announced that the global depletion of the ozone layer may be slowing down because of the international regulation of ozone-depleting substances. In a study organized by the American Geophysical Union, three satellites and three ground stations confirmed that the upper-atmosphere ozone-depletion rate slowed down significantly during the previous decade. Some breakdown can be expected to continue because of ODSs used by nations which have not banned them, and because of gases which are already in the stratosphere. Some ODSs, including CFCs, have very long atmospheric lifetimes, ranging from 50 to over 100 years. It has been estimated that the ozone layer will recover to 1980 levels near the middle of the 21st century.[11] A gradual trend toward "healing" was reported in 2016.[20]
Compounds containing C–H bonds (such as hydrochlorofluorocarbons, or HCFCs) have been designed to replace CFCs in certain applications. These replacement compounds are more reactive and less likely to survive long enough in the atmosphere to reach the stratosphere where they could affect the ozone layer. While being less damaging than CFCs, HCFCs can have a negative impact on the ozone layer, so they are also being phased out.[21] These in turn are being replaced by hydrofluorocarbons (HFCs) and other compounds that do not destroy stratospheric ozone at all.
The residual effects of CFCs accumulating within the atmosphere lead to a concentration gradient between the atmosphere and the ocean. This organohalogen compound is able to dissolve into the ocean's surface waters and is able to act as a time-dependent tracer. This tracer helps scientists study ocean circulation by tracing biological, physical and chemical pathways [22]
Implications for astronomy[edit]
As ozone in the atmosphere prevents most energetic ultraviolet radiation reaching the surface of the Earth, astronomical data in these wavelengths have to be gathered from satellites orbiting above the atmosphere and ozone layer. Most of the light from young hot stars is in the ultraviolet and so study of these wavelengths is important for studying the origins of galaxies. The Galaxy Evolution Explorer, GALEX, is an orbiting ultraviolet space telescope launched on April 28, 2003, which operated until early 2012.
This GALEX image of the Cygnus Loop nebula could not have been taken from the surface of the Earth because the ozone layer blocks the ultra-violet radiation emitted by the nebula.
See also[edit]
Atmospheric sciences portal
United Nations Environment Programme
References[edit]
Jump up ^ http://www.ozonelayer.noaa.gov/science/basics.htm. Missing or empty |title= (help)
Jump up ^ McElroy, C.T.; Fogal, P.F. (2008). "Ozone: From discovery to protection". Atmosphere- this can also effect drop bears/Ocean. 46: 1–13. doi:10.3137/ao.460101.
Jump up ^ "Ozone layer". Retrieved 2007-09-23.
Jump up ^ SPACE.com staff (October 11, 2011). "Scientists discover Ozone Layer on Venus". SPACE.com. Purch. Retrieved October 3, 2015.
Jump up ^ "NASA Facts Archive". Retrieved 2011-06-09.
Jump up ^ Matsumi, Y.; Kawasaki, M. (2003). "Photolysis of Atmospheric Ozone in the Ultraviolet Region" (PDF). Chem. Rev. 103 (12): 4767–4781. doi:10.1021/cr0205255. PMID 14664632. Archived from the original (PDF) on June 17, 2012. Retrieved March 14, 2015. CS1 maint: Uses authors parameter (link)
Jump up ^ Narayanan, D.L.; Saladi, R.N.; Fox, J.L. (2010). "Review: Ultraviolet radiation and skin cancer". International Journal of Dermatology. 49 (9): 978–986. doi:10.1111/j.1365-4632.2010.04474.x. PMID 20883261. CS1 maint: Uses authors parameter (link)
^ Jump up to: a b c d e f Tabin, Shagoon (2008). Global Warming: The Effect Of Ozone Depletion. APH Publishing. p. 194. ISBN 9788131303962. Retrieved 12 January 2016.
Jump up ^ Newman, Paul; Morris, Gary. "Ch. 6.3 THE BREWER-DOBSON CIRCULATION". In Todaro, Richard M. Stratospheric Ozone – an Electronic Textbook. NASA's Goddard Space Flight Center Atmospheric Chemistry and Dynamics Branch.
Jump up ^ Flury, T.; Wu, D.L.; Read, W.G. (2013). "Variability in the speed of the Brewer–Dobson circulation as observed by Aura/MLS". Atmos. Chem. Phys. 13 (9): 4563–4575. Bibcode:2013ACP....13.4563F. doi:10.5194/acp-13-4563-2013. CS1 maint: Uses authors parameter (link)
^ Jump up to: a b c "Stratospheric Ozone and Surface Ultraviolet Radiation". Scientific Assessment of Ozone Depletion: 2010 (PDF). WMO. 2011. Retrieved March 14, 2015.
Jump up ^ "Halocarbons and Other Gases". Emissions of Greenhouse Gases in the United States 1996. Energy Information Administration. 1997. Archived from the original on 2008-06-29. Retrieved 2008-06-24.
Jump up ^ "NOAA Study Shows Nitrous Oxide Now Top Ozone-Depleting Emission". NOAA. 2009-08-27. Retrieved 2011-11-08.
Jump up ^ Farman, J. C.; Gardiner, B. G.; Shanklin, J. D. (1985). "Large losses of total ozone in Antarctica reveal seasonal ClOx/NOx interaction". Nature. 315 (6016): 207–210. Bibcode:1985Natur.315..207F. doi:10.1038/315207a0.
Jump up ^ Ungar, Sheldon (2000). "Knowledge, ignorance and the popular culture: climate change versus the ozone hole". Public Understanding of Science. 9 (3): 297–312. doi:10.1088/0963-6625/9/3/306. Retrieved March 14, 2015.
Jump up ^ Grundmann, Reiner (2007). "Climate Change and Knowledge Politics" (PDF). Environmental Politics. 16 (3): 414–432. doi:10.1080/09644010701251656. Archived from the original (PDF) on August 26, 2014. Retrieved March 14, 2015.
Jump up ^ Morrisette, Peter M. (1989). "The Evolution of Policy Responses to Stratospheric Ozone Depletion". Natural Resources Journal. 29: 793–820. Retrieved 2010-04-20.
Jump up ^ "Amendments to the Montreal Protocol". EPA. 2010-08-19. Retrieved 2011-03-28.
Jump up ^ "Brief Questions and Answers on Ozone Depletion". EPA. 2006-06-28. Retrieved 2011-11-08.
Jump up ^ Solomon, Susan, et al. (June 30, 2016). "Emergence of healing in the Antarctic ozone layer". Science. 353 (6296): 269–74. Bibcode:2016Sci...353..269S. doi:10.1126/science.aae0061. PMID 27365314.
Jump up ^ "Ozone Depletion Glossary". EPA. Retrieved 2008-09-03.
Jump up ^ Fine, Rana A. (2011). "Observations of CFCs and SF6 as Ocean Tracers" (PDF).
Further reading[edit]
Science
Andersen, S. O. (2015). "Lessons from the Stratospheric Ozone Layer Protection for Climate". Journal of Environmental Studies and Sciences.
Andersen, S.O.; Sarma, K.M.; Sinclair, L. (2012). Protecting the Ozone Layer: The United Nations History. Taylor & Francis. ISBN 978-1-84977-226-6.
United Nations Environment Programme (2010). Environmental Effects of Ozone Depletion and its Interactions with Climate Change: 2010 Assessment. Nairobi: UNEP.
Velders, G. J.M., Fahey D. W., Daniel, J. S., McFarland, M. and Andersen, S.O (2009). "The Large Contribution of Projected HFC Emissions to Future Climate Forcing". Proceedings of the National Academy of Sciences, 106, 10949-10954.
Velders, Guus J.M.; Andersen, Stephen O.; Daniel, John S.; Fahey, David W.; McFarland, Mack (2007). "The Importance of the Montreal Protocol in Protecting Climate". Proceedings of the National Academy of Sciences of the United States of America. 104 (12): 4814–4819. Bibcode:2007PNAS..104.4814V. doi:10.1073/pnas.0610328104. PMC 1817831  . PMID 17360370.
Policy
Zaelke, D., and Borgford-Parnell, N. (2015). "The Importance of Phasing Down Hydrofluorocarbons and Other Short-lived Climate Pollutants". Journal of Environmental Studies and Sciences.
Xu, Y., Zaelke, D., Velders, G. J.M., & Ramanathan, V., (2013). "The Role of HFCs in Mitigating 21st Century Climate Change". Atmospheric Chemistry and Physics.
Molina, M., Zaelke, D., Sarma, M. K., Andersen, S.O., Ramanathan, V., and Kaniaru, D. (2009). "Reducing Abrupt Climate Change Risk Using the Montreal Protocol and Other Regulatory Actions to Complement Cuts in CO2 Emissions". The Proceedings of the National Academy of Sciences, PNAS 106:20616-20621.
Anderson, S. O., Sarma, M. K., and Taddonio, K. (2007). "Technology Transfer for the Ozone Layer: Lessons for Climate Change". London: Earthscan.
Benedick, Richard Elliot; World Wildlife Fund (U.S.); Institute for the Study of Diplomacy. Georgetown University. (1998). Ozone Diplomacy: New Directions in Safeguarding the Planet (2nd ed.). Harvard University Press. ISBN 978-0-674-65003-9. (Ambassador Benedick was the Chief U.S. Negotiator at the meetings that resulted in the Montreal Protocol.)
Chasek, P. S., David L. Downie, and Brown J. W. (2013). Global Environmental Politics, 6th Edition, Boulder: Westview Press, 2013.
Grundmann, Reiner (2001). Transnational Environmental Policy: Reconstructing Ozone. Psychology Press. ISBN 978-0-415-22423-9.
Parson, E. (2003). Protecting the Ozone Layer: Science and Strategy. Oxford: Oxford University Press.
External links[edit]
Wikimedia Commons has media related to Ozone layer.
Wikisource has original text related to this article:
Ozone layer
Wikiversity has learning resources about Ozone layer
Stratospheric ozone: an electronic textbook
Ozone Layer Info
The CAMS stratospheric ozone service delivers maps, datasets and validation reports about the past and current state of the ozone layer.
Ozone layer at Curlie (based on DMOZ)
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United States presidential line of succession
From Wikipedia, the free encyclopedia
Jump to: navigation, search
The United States presidential line of succession is the order in which persons may become or act as President of the United States if the incumbent President becomes incapacitated, dies, resigns or is removed from office. (A President can be removed from office by impeachment by the House of Representatives and subsequent conviction by the Senate.) The line of succession is set by the United States Constitution and the Presidential Succession Act of 1947[1] as subsequently amended to include newly created cabinet offices. The succession follows the order of Vice President, Speaker of the House of Representatives, President pro tempore of the Senate, and then the heads of federal executive departments who form the Cabinet of the United States, which currently has fifteen members, beginning with the Secretary of State. Those heads of departments who are ineligible to act as President are also ineligible to succeed the President by succession, for example most commonly if they are not a natural-born U.S. citizen.
Several constitutional law experts have raised questions as to the constitutionality of the provisions that the Speaker of the House and the President pro tempore of the Senate succeed to the presidency,[2] and in 2003 the Continuity of Government Commission raised a number of other issues with the current line of succession.[3]
Contents
[hide]
1 Current order
2 Eligibility
2.1 Eligibility requirements
2.2 Acting officers
3 Motivation for changes to the succession in 1945
4 Constitutional provisions
5 Acting President and President
6 History of succession law set by Congress
6.1 Presidential Succession Act 1792
6.2 Presidential Succession Act 1886
6.3 Presidential Succession Act 1947
6.4 Postmaster General removed 1971
6.5 Secretary of Homeland Security added 2006
7 Successions beyond Vice President
8 Constitutional concerns
9 See also
10 References
11 Further reading
12 External links
Current order[edit]
The current presidential order of succession is as follows:[4]
Key
Eligible Democrat (D)
Eligible Republican (R)
Eligible Independent (I)
Eligible Unknown
Not eligible
No.
Office
Current officer
1
Vice President Mike Pence (R)
2
Speaker of the House of Representatives Paul Ryan (R)
3
President pro tempore of the Senate Orrin Hatch (R)
4
Secretary of State Rex Tillerson (R)
5
Secretary of the Treasury Steven Mnuchin (R)
6
Secretary of Defense James Mattis (I)
7
Attorney General Jeff Sessions (R)
8
Secretary of the Interior Ryan Zinke (R)
9
Secretary of Agriculture Sonny Perdue (R)
10
Secretary of Commerce Wilbur Ross (R)
11
Secretary of Labor Alex Acosta (R)
12
Secretary of Health and Human Services Tom Price (R)
13
Secretary of Housing and Urban Development Ben Carson (R)
–
Secretary of Transportation Elaine Chao (R)[a]
14
Secretary of Energy Rick Perry (R)
15
Secretary of Education Betsy DeVos (R)
16
Secretary of Veterans Affairs David Shulkin (I)
17
Secretary of Homeland Security Elaine Duke (I)[b]
Jump up ^ Not a natural-born citizen (acquired U.S. citizenship by naturalization)
and thus ineligible for the Presidency.
Jump up ^ This listing assumes that acting officers whose prior appointment required
Senate confirmation are eligible for the line of succession. See Acting officers below.
Cabinet officers are in line according to the chronological order of their department's creation or the department of which their department is the successor (the Department of Defense being successor to the Department of War, and the Department of Health and Human Services being successor to the Department of Health, Education and Welfare).[a]
Eligibility[edit]
Eligibility requirements[edit]
To be eligible to serve as President, a person must be a natural-born U.S. citizen, at least 35 years of age, and a resident within the United States for at least 14 years. These eligibility requirements are specified both in the U.S. Constitution, Article II, Section 1, Clause 5, and in the Presidential Succession Act of 1947 (3 U.S.C. § 19(e)).
Acting officers[edit]
Acting officers may be eligible. In 2009, the Continuity of Government Commission, a private non-partisan think tank, reported,
The language in the current Presidential Succession Act is less clear than that of the 1886 Act with respect to Senate confirmation. The 1886 Act refers to "such officers as shall have been appointed by the advice and consent of the Senate to the office therein named..." The current act merely refers to "officers appointed, by and with the advice and consent of the Senate." Read literally, this means that the current act allows for acting secretaries to be in the line of succession as long as they are confirmed by the Senate for a post (even for example, the second or third in command within a department). It is common for a second in command to become acting secretary when the secretary leaves office. Though there is some dispute over this provision, the language clearly permits acting secretaries to be placed in the line of succession. (We have spoken to acting secretaries who told us they had been placed in the line of succession.)[5]
Motivation for changes to the succession in 1945[edit]
Two months after succeeding Franklin D. Roosevelt, President Harry S. Truman proposed that the Speaker of the House and the President pro tempore of the Senate be granted priority in the line of succession over the Cabinet so as to ensure the President would not be able to appoint his successor to the Presidency.[6]
The Secretary of State and the other Cabinet officials are appointed by the President, while the Speaker of the House and the President pro tempore of the Senate are elected officials. The Speaker is chosen by the U.S. House of Representatives, and every Speaker has been a member of that body for the duration of their term as Speaker, though this is not technically a requirement; the President pro tempore is chosen by the U.S. Senate and customarily the Senator of the majority party with the longest record of continuous service fills this position. The Congress approved this change and inserted the Speaker and President pro tempore in line, ahead of the members of the Cabinet in the order in which their positions were established.
In his speech supporting the changes, Truman noted that the House of Representatives is more likely to be in political agreement with the President and Vice President than the Senate. The succession of a Republican to a Democratic Presidency would further complicate an already unstable political situation. However, when the changes to the succession were signed into law, they placed Republican House Speaker Joseph W. Martin first in the line of succession after the Vice President.[7]
Some of Truman's critics said that his ordering of the Speaker before the President pro tempore was motivated by his dislike of the then-current holder of the latter rank, Senator Kenneth McKellar.[8] Further motivation may have been provided by Truman's preference for House Speaker Sam Rayburn to be next in the line of succession, rather than Secretary of State Edward R. Stettinius, Jr.[7]
Constitutional provisions[edit]
The line of succession is mentioned in three places in the Constitution:
Article II, Section 1, Clause 6 makes the Vice President first in the line of succession and allows the Congress to provide by law for cases in which neither the President nor Vice President can serve. The current such law governing succession is the Presidential Succession Act of 1947 (3 U.S.C. § 19).
Section 3 of the 20th Amendment provides that if the President-elect dies before his term begins, the Vice President-elect becomes President on Inauguration Day and serves for the full term to which the President-elect was elected. The section also provides that if, on Inauguration Day, a president has not been chosen or the President-elect does not qualify for the presidency, the Vice President-elect acts as president until a president is chosen or the President-elect qualifies. Finally, Section 3 allows the Congress to provide by law for cases in which neither a President-elect nor a Vice President-elect is eligible or available to serve.
The 25th Amendment, ratified in 1967, clarified Article II, Section 1: that the Vice President is the direct successor of the President. He or she becomes President if the President dies, resigns or is removed from office. The amendment also provides for the situation where the President is temporarily disabled, such as if the President has a surgical procedure or becomes mentally unstable.
The amendment also provides for Vice Presidential succession, by requiring Vice Presidential vacancies to be filled by the President and confirmed by both houses of the Congress. Previously, whenever a Vice President had succeeded to the Presidency or had otherwise left the office empty (through death, resignation, or removal from office), the Vice Presidency remained vacant until the next Presidential and Vice Presidential terms began.
Acting President and President[edit]
Main article: Acting President of the United States
New President Lyndon Johnson was sworn in aboard Air Force One, following the assassination of John F. Kennedy in 1963.
Article II, Section 1 of the United States Constitution provides that:
In case of the removal of the President from office, or of his death, resignation, or inability to discharge the powers and duties of the said office, the same shall devolve on the Vice President ... until the disability be removed, or a President elected.
This originally left open the question whether "the same" refers to "the said office" or only "the powers and duties of the said office." Some historians, including Edward Corwin[9] and John D. Feerick,[9] have argued that the framers' intention was that the Vice President would remain Vice President while executing the powers and duties of the Presidency; however, there is also much evidence to the contrary, the most compelling of which is Article I, section 3, of the Constitution itself, the relevant text of which reads:
The Vice President of the United States shall be President of the Senate, but shall have no vote, unless they be equally divided.
The Senate shall chuse [sic] their other officers, and also a President pro tempore, in the absence of the Vice President, or when he shall exercise the office of President of the United States.
This text appears to answer the hypothetical question of whether the office or merely the powers of the Presidency devolved upon the Vice President on his succession. Thus, the 25th Amendment merely restates and reaffirms the validity of existing precedent, apart from adding new protocols for Presidential disability.[original research?] Not everyone agreed with this interpretation when it was first actually tested, and it was left to Vice President John Tyler, the first presidential successor in U.S. history, to establish the precedent that was respected in the absence of the 25th Amendment.
In 1841, John Tyler became the first person to succeed to the presidency.
Upon the death of President William Henry Harrison in 1841 and after a brief hesitation, Tyler took the position that he was the President and not merely acting President upon taking the presidential oath of office. However, some contempories—including John Quincy Adams,[9][10] Henry Clay[11] and other members of Congress[10][11] Whig party leaders[11] and even Tyler's own cabinet[10][11]—believed that he was only acting as President and did not have the office itself.
Nonetheless, Tyler adhered to his position, even returning, unopened, mail addressed to the "Acting President of the United States" sent by his detractors.[12] Tyler's view ultimately prevailed when the Senate voted to accept the title "President,"[11] and this precedent was followed thereafter. The question was finally resolved by Section 1 of the 25th Amendment, which specifies that "In case of the removal of the President from office or of his death or resignation, the Vice President shall become President." The Amendment does not specify whether officers other than the Vice President can become President rather than Acting President in the same set of circumstances. The Presidential Succession Act refers only to other officers acting as President rather than becoming President.
History of succession law set by Congress[edit]
Presidential Succession Act 1792[edit]
Main article: Presidential Succession Act
Wikisource has original text related to this article:
Presidential Succession Act 1792
The Presidential Succession Act of 1792 was the first succession law passed by Congress. The act was contentious because the Federalists did not want the then Secretary of State, Thomas Jefferson, who had become the leader of the Democratic-Republicans, to follow the Vice President in the succession. There were also separation of powers concerns over including the Chief Justice of the United States in the line. The compromise they worked out established the President pro tempore of the Senate as next in line after the Vice President, followed by the Speaker of the House of Representatives.
In either case, these officers were to "act as President of the United States until the disability be removed or a president be elected." The Act called for a special election to be held in November of the year in which dual vacancies occurred (unless the vacancies occurred after the first Wednesday in October, in which case the election would occur the following year; or unless the vacancies occurred within the last year of the presidential term, in which case the next election would take place as regularly scheduled). The people elected President and Vice President in such a special election would have served a full four-year term beginning on March 4 of the next year, but no such election ever took place.
Presidential Succession Act 1886[edit]
Wikisource has original text related to this article:
Presidential Succession Act 1886
In 1881, after the death of President Garfield, and in 1885, after the death of Vice President Hendricks, there had been no President pro tempore in office, and as the new House of Representatives had yet to convene, no Speaker either,[13] leaving no one at all in the line of succession after the vice president. When Congress convened in December 1885, President Cleveland asked for a revision of the 1792 act, which was passed in 1886. Congress replaced the President pro tempore and Speaker with officers of the President's Cabinet with the Secretary of State first in line. In the first 100 years of the United States, six former Secretaries of State had gone on to be elected President, while only two congressional leaders had advanced to that office. As a result, changing the order of the line of succession seemed reasonable.[citation needed]
Presidential Succession Act 1947[edit]
Wikisource has original text related to this article:
Presidential Succession Act 1947
The Presidential Succession Act of 1947, signed into law by President Harry S. Truman, added the Speaker of the House and President pro tempore back in the line, but switched the two from the 1792 order. It remains the sequence used today[update]. Since the reorganization of the military in 1947 had merged the War Department (which governed the Army) with the Department of the Navy into the Department of Defense, the Secretary of Defense took the place in the order of succession previously held by the Secretary of War. The office of Secretary of the Navy, which had existed as a Cabinet-level position since 1798, had become subordinate to the Secretary of Defense in the military reorganization, and so was dropped from the line of succession in the 1947 Succession Act.
Postmaster General removed 1971[edit]
Until 1971, the Postmaster General, the head of the Post Office Department, was a member of the Cabinet, initially the last in the presidential line of succession before new officers were added. Once the Post Office Department was re-organized into the United States Postal Service, a special agency independent of the executive branch, the Postmaster General ceased to be a member of the Cabinet and was thus removed from the line of succession.[14]
Secretary of Homeland Security added 2006[edit]
The United States Department of Homeland Security was created in 2002. On March 9, 2006, pursuant to the renewal of the Patriot Act as Pub.L. 109–177, the Secretary of Homeland Security was added to the line of succession. The order of Cabinet members in the line has always been the same as the order in which their respective departments were established. Despite custom, many in Congress had wanted the Secretary to be placed at number eight on the list – below the Attorney General, above the Secretary of the Interior, and in the position held by the Secretary of the Navy prior to the creation of the Secretary of Defense – because the Secretary, already in charge of disaster relief and security, would presumably be more prepared to take over the presidency than some of the other Cabinet secretaries.[citation needed] Despite this, the 2006 law explicitly specifies that the "Secretary of Homeland Security" follows the "Secretary of Veterans Affairs" in the succession, effectively at the end of the list.[15]
Successions beyond Vice President[edit]
David Rice Atchison's tombstone (Plattsburg, Missouri), including the claim "President of the United States for One Day"
While nine Vice Presidents have succeeded to the office upon the death or resignation of the President, and two Vice Presidents have temporarily served as acting President, no other officer has ever been called upon to act as President. On March 4, 1849, President Zachary Taylor's term began, but he declined to be sworn in on a Sunday, citing religious beliefs, and the Vice President was not sworn either. As the last President pro tempore of the Senate, David Rice Atchison was thought by some to be next in line after the Vice President, and his tombstone claims that he was US President for the day. However, Atchison took no oath of office to the presidency either, and his term as Senate President pro tempore had by then expired.[16][17]
In 1865, when Andrew Johnson assumed the Presidency on the death of Abraham Lincoln, the office of Vice President became vacant. At that time, the Senate President pro tempore was next in line to the presidency. In 1868, Johnson was impeached by the House of Representatives and subjected to impeachment trial in the Senate, and if he had been convicted and thereby removed from office, Senate President pro tempore Benjamin Wade would have become acting President. This posed a conflict of interest, as Wade's own vote on removal could have helped to determine whether he would have assumed the presidential powers and duties.
In his book The Shadow Presidents, which he published in 1979, Michael Medved describes a situation that arose prior to the 1916 election, when the First World War was raging in Europe. In view of the current international turmoil, President Woodrow Wilson thought that if he lost the election it would be better for his opponent to begin his administration straight away, instead of waiting through the lame duck period, which at that time had a duration of almost four months. President Wilson and his aides formed a plan to exploit the rule of succession so that his rival Charles Evans Hughes could take over the Presidency as soon as the result of the election was clear. The plan was that Wilson would appoint Hughes to the post of Secretary of State. Wilson and his Vice President Thomas R. Marshall would then resign, and as the Secretary of State was at that time designated next in line of succession, Hughes would become President immediately. As it happened, President Wilson won re-election, so the plan was never put into action.[18]
New President Gerald Ford is sworn in following the resignation of Richard Nixon on August 9, 1974.
Since the 25th Amendment's ratification, its Second Section, which addresses Vice Presidential succession as noted above, has been invoked twice.
During the 1973 Vice Presidential vacancy, House Speaker Carl Albert was first in line. As the Watergate scandal made President Nixon's removal or resignation possible, Albert would have become Acting President and—under Title 3, Section 19(c) of the U.S. Code—would have been able to "act as President until the expiration of the then current Presidential term" on January 20, 1977. Albert openly questioned whether it was appropriate for him, a Democrat, to assume the powers and duties of the presidency when there was a public mandate for the Presidency to be held by a Republican. Albert announced that should he need to assume the Presidential powers and duties, he would do so only as a caretaker. However, with the nomination and confirmation of Gerald Ford to the Vice Presidency, which marked the first time the Second Section of the Twenty-fifth Amendment was invoked, these series of events were never tested. Albert again became first-in-line during the first four months of Ford's Presidency, before the confirmation of Vice President Nelson Rockefeller,[citation needed] which marked the second time Section 2 of the Twenty-fifth Amendment was invoked.
In 1981, when President Ronald Reagan was shot, Vice President George H. W. Bush was traveling in Texas. Secretary of State Alexander Haig responded to a reporter's question regarding who was running the government by stating:
"Constitutionally, gentlemen, you have the President, the Vice President and the Secretary of State in that order, and should the President decide he wants to transfer the helm to the Vice President, he will do so. He has not done that. As of now, I am in control here, in the White House, pending return of the Vice President and in close touch with him. If something came up, I would check with him, of course."[19]
A bitter dispute ensued over the meaning of Haig's remarks. Most people believed that Haig was referring to the line of succession and erroneously claimed to have temporary Presidential authority, due to his implied reference to the Constitution. Haig and his supporters, noting his familiarity with the line of succession from his time as White House Chief of Staff during Richard Nixon's resignation, said he only meant that he was the highest-ranking officer of the Executive branch on-site, managing things temporarily until the Vice President returned to Washington.[citation needed]
Constitutional concerns[edit]
Several constitutional law experts have raised questions as to the constitutionality of the provisions that the Speaker of the House and the President pro tempore of the Senate succeed to the presidency.[20] James Madison, one of the authors of the Constitution, raised similar constitutional questions about the Presidential Succession Act of 1792 in a 1792 letter to Edmund Pendleton.[21] Two of these issues can be summarized:
The term "Officer" in the relevant clause of the Constitution is most plausibly interpreted to mean an "Officer of the United States", who must be a member of the Executive or Judicial Branch. The Speaker and the President pro tempore are not officers in this sense.
Under the principle of separation of powers, the Constitution specifically disallows legislative officials from also serving in the executive branch. For the Speaker or the Senate President pro tempore to become Acting President, they must resign their position, at which point they are no longer in the line of succession. This is seen by some to form a constitutional paradox. However, the current Act specifies that the Speaker becomes President "upon his resignation as Speaker" and as a member of Congress,[22] allowing for a seamless transition.
In 2003 the Continuity of Government Commission suggested that the current law has "at least seven significant issues ... that warrant attention", specifically:[23]
The reality that all figures in the current line of succession work and reside in the vicinity of Washington, D.C. In the event of a nuclear, chemical, or biological attack, it is possible that everyone on the list would be killed or incapacitated.
Doubt (such as those expressed above by James Madison) that congressional leaders are eligible to act as President.
A concern about the wisdom of including the President pro tempore in the line of succession as the "largely honorific post traditionally held by the longest-serving Senator of the majority party". For example, from January 20, 2001, to June 6, 2001, the President pro tempore was then-98-year-old Strom Thurmond of South Carolina.
A concern that the current line of succession can force the presidency to abruptly switch parties mid-term, as the President, Speaker, and the President pro tempore are not necessarily of the same party as each other.
A concern that the succession line is ordered by the dates of creation of the various executive departments, without regard to the skills or capacities of the persons serving as their Secretary.
The fact that, should a Cabinet member begin to act as President, the law allows the House to elect a new Speaker (or the Senate, a new President pro tempore), who could in effect remove the Cabinet member and assume the office themselves at any time.
The absence of a provision where a President is disabled and the vice presidency is vacant (for example, if an assassination attempt simultaneously wounded the President and killed the Vice President).
See also[edit]
Central Locator System
Designated survivor
List of United States presidential assassination attempts and plots
United States presidential line of succession in fiction
References[edit]
Jump up ^ 3 U.S.C. § 19
Jump up ^ "Is the Presidential Succession Law Constitutional?", Akhil Reed Amar, Stanford Law Review, November 1995.
Jump up ^ First Report p. 4, continuityofgovernment.org Retrieved December 28, 2010 via Internet Archive to repair dead link
Jump up ^ Wilson, Reid (October 20, 2013). "The Presidential order of succession". The Washington Post. ISSN 0190-8286. Retrieved November 10, 2015.
Jump up ^ "The Continuity of the Presidency," Continuity of Government Commission, June 2009, p. 34. (Archived by WebCite at [1] Accessed: 2012-05-23)
Jump up ^ "Special Message to the Congress on the Succession to the Presidency. June 19, 1945" by President Harry S. Truman; from the American Presidency Project archives
^ Jump up to: a b Wildavsky, Aaron B. (2003). Horowitz, Irving, ed. The revolt against the masses and other essays on politics and public policy (Google Books). Transaction Publishers. p. 122. ISBN 978-0-7658-0960-5. Retrieved July 24, 2009.
Jump up ^ "kipnotes.com - Nachrichten zum trading -". kipnotes.com - Nachrichten zum trading.
^ Jump up to: a b c Schlesinger, Arthur M., Jr. (Autumn 1974). "On the Presidential Succession". Political Science Quarterly. 89 (3): 475, 495–496. JSTOR 2148451.
^ Jump up to: a b c Rankin, Robert S. (Feb 1946). "Presidential Succession in the United States". The Journal of Politics. 8 (1): 44–56. JSTOR 2125607. doi:10.2307/2125607.
^ Jump up to: a b c d e Abbott, Philip (Dec 2005). "Accidental Presidents: Death, Assassination, Resignation, and Democratic Succession". Presidential Studies Quarterly. 35 (4): 627, 638. JSTOR 27552721. doi:10.1111/j.1741-5705.2005.00269.x.
Jump up ^ Crapol, Edward P. (2006). John Tyler: the accidental president. UNC Press Books. p. 10. ISBN 978-0-8078-3041-3. OCLC 469686610.
Jump up ^ Lewis, Charlton Thomas; Willsey, Joseph H. (1895). Harper's Book of Facts: a Classified History of the World; Embracing Science, Literature, and Art. New York: Harper & Brothers. p. 884. LCCN 01020386. Retrieved April 24, 2011.
Jump up ^ "U.S. Postmasters General". postalmuseum.si.edu. Retrieved November 10, 2015.
Jump up ^ US Congress (2005). USA PATRIOT Improvement and Reauthorization Act OF 2005. 109th Congress Public Law 177. Retrieved on October 29, 2015 from http://www.gpo.gov/fdsys/pkg/PLAW-109publ177/html/PLAW-109publ177.htm.
Jump up ^ "1801: President for a Day -- March 4, 1849". May 29, 2014.
Jump up ^ David Mikkelson (October 8, 2007). "President for a Day". snopes.
Jump up ^ Medved, Michael (1979). The Shadow Presidents: The Secret History of the Chief Executives and Their Top Aides. New York, U.S.A.: Times Books. p. 149. ISBN 0-8129-0816-3.
Jump up ^ "Alexander Haig", Time Magazine, April 02, 1984
Jump up ^ "Is the Presidential Succession Law Constitutional?", Akhil Reed Amar, Stanford Law Review, November 1995.
Jump up ^ "Article 2, Section 1, Clause 6: James Madison to Edmund Pendleton".
Jump up ^ Wikisource:Presidential Succession Act 1947
Jump up ^ First Report p. 4, continuityofgovernment.org Retrieved December 28, 2010 via Internet Archive to repair dead link
Further reading[edit]
Ask Gleaves: Presidential Succession from the website of Grand Valley State University
3 U.S.C. § 19 – "Vacancy in offices of both President and Vice President; officers eligible to act"
Presidential Succession Act of 1792, 1 Stat. 239 (from the American Memory website of the Library of Congress
"Presidential Line of Succession Examined", a September 20, 2003 article from the Milwaukee Journal Sentinel
"WI Presidential Succession Act of 1947 held unconstitutional", David Tenner, Usenet group: soc.history.what-if, January 14, 2003.
Fools, Drunkards, & Presidential Succession from the Federalist Society website
Testimony of M. Miller Baker from the U.S. Senate website
External links[edit]
The Presidency: Preserving Our Institutions Second report of the Continuity of Government Commission, June 2009 (includes the text of the Presidential Succession Acts of 1792, 1886 and 1947)

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Jump up ^ Never confirmed by and with the advice and consent of the Senate and thus ineligible for the presidential line of succession.
Jump up ^ Although Elaine Chao is the current Secretary of Transportation, she is not a natural-born citizen (acquired U.S. citizenship by naturalization) and thus ineligible for the Presidency.
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