Publication Date:
2010-01-16
Description:
Wetlands are the largest individual source of methane (CH4), but the magnitude and distribution of this source are poorly understood on continental scales. We isolated the wetland and rice paddy contributions to spaceborne CH4 measurements over 2003-2005 using satellite observations of gravity anomalies, a proxy for water-table depth Gamma, and surface temperature analyses TS. We find that tropical and higher-latitude CH4 variations are largely described by Gamma and TS variations, respectively. Our work suggests that tropical wetlands contribute 52 to 58% of global emissions, with the remainder coming from the extra-tropics, 2% of which is from Arctic latitudes. We estimate a 7% rise in wetland CH4 emissions over 2003-2007, due to warming of mid-latitude and Arctic wetland regions, which we find is consistent with recent changes in atmospheric CH4.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bloom, A Anthony -- Palmer, Paul I -- Fraser, Annemarie -- Reay, David S -- Frankenberg, Christian -- New York, N.Y. -- Science. 2010 Jan 15;327(5963):322-5. doi: 10.1126/science.1175176.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉School of GeoSciences, University of Edinburgh, Edinburgh, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20075250" target="_blank"〉PubMed〈/a〉
Keywords:
Archaea/metabolism
;
Atmosphere/*chemistry
;
*Crops, Agricultural/growth & development
;
Geography
;
Gravitation
;
Methane/*analysis/biosynthesis
;
*Oryza/growth & development
;
Seasons
;
Spacecraft
;
Temperature
;
Tropical Climate
;
*Wetlands
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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