Understanding the glacial methane cycle

被引：41

作者：

Hopcroft, Peter O. ^{[1
,2
]}

Valdes, Paul J. ^{[1
,2
]}

O'Connor, Fiona M. ^{[3
]}

Kaplan, Jed O. ^{[4
]}

Beerling, David J. ^{[5
]}

机构：

[1] Univ Bristol, Sch Geog Sci, Bristol Res Initiat Dynam Global Environm, Univ Rd, Bristol BS8 1SS, Avon, England

[2] Univ Bristol, Cabot Inst, Univ Rd, Bristol BS8 1SS, Avon, England

[3] Met Off Hadley Ctr, FitzRoy Rd, Exeter EX1 3PB, Devon, England

[4] Univ Lausanne, Inst Earth Surface Dynam, Geopolis Bldg, CH-1015 Lausanne, Switzerland

[5] Univ Sheffield, Dept Anim & Plant Sci, Alfred Denny Bldg, Sheffield S10 2TN, S Yorkshire, England

来源：

NATURE COMMUNICATIONS | 2017年 / 8卷

基金：

欧洲研究理事会;

关键词：

ENVIRONMENT SIMULATOR JULES; GLOBAL WETLAND EXTENT; OXIDATIVE CAPACITY; ISOPRENE EMISSIONS; MODEL DESCRIPTION; CLIMATE FEEDBACK; PRESENT STATE; FIRE REGIMES; PART; MAXIMUM;

D O I：

10.1038/ncomms14383

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Atmospheric methane (CH4) varied with climate during the Quaternary, rising from a concentration of 375 p.p.b.v. during the last glacial maximum (LGM) 21,000 years ago, to 680 p.p.b.v. at the beginning of the industrial revolution. However, the causes of this increase remain unclear; proposed hypotheses rely on fluctuations in either the magnitude of CH4 sources or CH4 atmospheric lifetime, or both. Here we use an Earth System model to provide a comprehensive assessment of these competing hypotheses, including estimates of uncertainty. We show that in this model, the global LGM CH4 source was reduced by 28-46%, and the lifetime increased by 2-8%, with a best-estimate LGM CH4 concentration of 463-480 p.p.b.v. Simulating the observed LGM concentration requires a 46-49% reduction in sources, indicating that we cannot reconcile the observed amplitude. This highlights the need for better understanding of the effects of low CO2 and cooler climate on wetlands and other natural CH4 sources.

引用

页数：10

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