The role of wetland expansion and successional processes in methane emissions from northern wetlands during the Holocene

QUATERNARY SCIENCE REVIEWS

卷:257

Article

Treat, Claire C.^1,2,4  Jones, Miriam C.³  Brosius, Laura¹  Grosse, Guido^4,5  Anthony, Katey Walter¹  Frolking, Steve² 

[1] Univ Alaska Fairbanks, Water & Environm Res Ctr, Inst Northern Engn, Fairbanks, AK 99775 USA

[2] Univ New Hampshire, Inst Study Earth Oceans & Space, Durham, NH 03824 USA

[3] US Geol Survey, Reston, VA 20192 USA

[4] Helmholtz Ctr Polar & Marine Res, Alfred Wegner Inst, D-14473 Potsdam, Germany

[5] Univ Potsdam, Inst Geosci, D-14476 Potsdam, Germany

关键词: Methane;    Wetland;    Peatland;    Holocene;    Bog;    Permafrost;   

DOI  :  10.1016/j.quascirev.2021.106864

来源: Elsevier

【 摘 要 】

The contribution from northern high latitude wetlands are a major uncertainty in the atmospheric methane (CH4) budget throughout the Holocene. We reconstructed CH4 emissions from northern peatlands from 13,000 BP to present using an empirical model based on observations of peat initiation (>3600 dates), peatland type (>250 peat cores), and observed CH4 emissions in order to explore the effects of changes in wetland type on CH4 emissions over the end of the late glacial and the Holocene. Fen area increased steadily before 8000 BP as fens formed in major wetland complexes. After 8000 BP, new fen formation continued but widespread peatland succession (to bogs) and permafrost aggradation occurred. Reconstructed CH4 emissions from peatlands increased rapidly between 10,600 BP and 6900 BP due to fen formation and expansion. Emissions stabilized after 5000 BP at 42 +/- 25 Tg CH4 y(-1) as high-emitting fens transitioned to lower-emitting bogs and permafrost peatlands. Widespread permafrost formation in northern peatlands after 1000 BP decreased CH4 emissions by 20%-34 +/- 21 Tg y(-1) by the present day and suggests peatland CH4 emissions will increase with permafrost thaw. (C) 2021 The Authors. Published by Elsevier Ltd.

【 授权许可】

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