Publication Date:
2011-01-08
Description:
The oxidizing capacity of the global atmosphere is largely determined by hydroxyl (OH) radicals and is diagnosed by analyzing methyl chloroform (CH(3)CCl(3)) measurements. Previously, large year-to-year changes in global mean OH concentrations have been inferred from such measurements, suggesting that the atmospheric oxidizing capacity is sensitive to perturbations by widespread air pollution and natural influences. We show how the interannual variability in OH has been more precisely estimated from CH(3)CCl(3) measurements since 1998, when atmospheric gradients of CH(3)CCl(3) had diminished as a result of the Montreal Protocol. We infer a small interannual OH variability as a result, indicating that global OH is generally well buffered against perturbations. This small variability is consistent with measurements of methane and other trace gases oxidized primarily by OH, as well as global photochemical model calculations.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Montzka, S A -- Krol, M -- Dlugokencky, E -- Hall, B -- Jockel, P -- Lelieveld, J -- New York, N.Y. -- Science. 2011 Jan 7;331(6013):67-9. doi: 10.1126/science.1197640.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉NOAA Earth System Research Laboratory, Boulder, CO 80305, USA. stephen.a.montzka@noaa.gov〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21212353" target="_blank"〉PubMed〈/a〉
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
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Chemistry and Pharmacology
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Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
