Document Detail

Stratospheric ozone depletion due to nitrous oxide: influences of other gases.
MedLine Citation:
PMID:  22451111     Owner:  NLM     Status:  MEDLINE    
The effects of anthropogenic emissions of nitrous oxide (N(2)O), carbon dioxide (CO(2)), methane (CH(4)) and the halocarbons on stratospheric ozone (O(3)) over the twentieth and twenty-first centuries are isolated using a chemical model of the stratosphere. The future evolution of ozone will depend on each of these gases, with N(2)O and CO(2) probably playing the dominant roles as halocarbons return towards pre-industrial levels. There are nonlinear interactions between these gases that preclude unambiguously separating their effect on ozone. For example, the CH(4) increase during the twentieth century reduced the ozone losses owing to halocarbon increases, and the N(2)O chemical destruction of O(3) is buffered by CO(2) thermal effects in the middle stratosphere (by approx. 20% for the IPCC A1B/WMO A1 scenario over the time period 1900-2100). Nonetheless, N(2)O is expected to continue to be the largest anthropogenic emission of an O(3)-destroying compound in the foreseeable future. Reductions in anthropogenic N(2)O emissions provide a larger opportunity for reduction in future O(3) depletion than any of the remaining uncontrolled halocarbon emissions. It is also shown that 1980 levels of O(3) were affected by halocarbons, N(2)O, CO(2) and CH(4), and thus may not be a good choice of a benchmark of O(3) recovery.
R W Portmann; J S Daniel; A R Ravishankara
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Philosophical transactions of the Royal Society of London. Series B, Biological sciences     Volume:  367     ISSN:  1471-2970     ISO Abbreviation:  Philos. Trans. R. Soc. Lond., B, Biol. Sci.     Publication Date:  2012 May 
Date Detail:
Created Date:  2012-03-27     Completed Date:  2012-10-16     Revised Date:  2013-06-26    
Medline Journal Info:
Nlm Unique ID:  7503623     Medline TA:  Philos Trans R Soc Lond B Biol Sci     Country:  England    
Other Details:
Languages:  eng     Pagination:  1256-64     Citation Subset:  IM    
NOAA Earth System Research Laboratory, Chemical Sciences Division, Boulder, CO 80305-3328, USA.
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MeSH Terms
Atmosphere / chemistry*
Carbon Dioxide / chemistry*
Greenhouse Effect
Methane / chemistry*
Models, Chemical*
Nitrous Oxide / chemistry*
Ozone / chemistry*
Reg. No./Substance:
10024-97-2/Nitrous Oxide; 10028-15-6/Ozone; 124-38-9/Carbon Dioxide; 74-82-8/Methane

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