Renewed growth of atmospheric methane

被引：352

作者：

Rigby, M. ^{[1
]}

Prinn, R. G. ^{[1
]}

Fraser, P. J. ^{[2
]}

Simmonds, P. G. ^{[3
]}

Langenfelds, R. L. ^{[2
]}

Huang, J. ^{[1
]}

Cunnold, D. M. ^{[4
]}

Steele, L. P. ^{[2
]}

Krummel, P. B. ^{[2
]}

Weiss, R. F. ^{[5
]}

O'Doherty, S. ^{[3
]}

Salameh, P. K. ^{[5
]}

Wang, H. J. ^{[4
]}

Harth, C. M. ^{[5
]}

Muehle, J. ^{[5
]}

Porter, L. W. ^{[6
]}

机构：

[1] MIT, Ctr Global Change Sci, Cambridge, MA 02139 USA

[2] CSIRO Marine & Atmospher Res, Ctr Australian Weather & Climate Res, Aspendale, Vic 3195, Australia

[3] Univ Bristol, Sch Chem, Bristol BS8 1TS, Avon, England

[4] Georgia Inst Technol, Sch Earth & Atmospher Sci, Atlanta, GA 30332 USA

[5] Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA

[6] Australian Govt Bur Meteorol, Melbourne, Vic, Australia

来源：

GEOPHYSICAL RESEARCH LETTERS | 2008年 / 35卷 / 22期

关键词：

D O I：

10.1029/2008GL036037

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Following almost a decade with little change in global atmospheric methane mole fraction, we present measurements from the Advanced Global Atmospheric Gases Experiment (AGAGE) and the Australian Commonwealth Scientific and Industrial Research Organisation (CSIRO) networks that show renewed growth starting near the beginning of 2007. Remarkably, a similar growth rate is found at all monitoring locations from this time until the latest measurements. We use these data, along with an inverse method applied to a simple model of atmospheric chemistry and transport, to investigate the possible drivers of the rise. Specifically, the relative roles of an increase in emission rate or a decrease in concentration of the hydroxyl radical, the largest methane sink, are examined. We conclude that: 1) if the annual mean hydroxyl radical concentration did not change, a substantial increase in emissions was required simultaneously in both hemispheres between 2006 and 2007; 2) if a small drop in the hydroxyl radical concentration occurred, consistent with AGAGE methyl chloroform measurements, the emission increase is more strongly biased to the Northern Hemisphere. Citation: Rigby, M., et al. (2008), Renewed growth of atmospheric methane, Geophys. Res. Lett., 35, L22805, doi: 10.1029/2008GL036037.

引用

页数：6

共 20 条

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