Methane emissions from pan-Arctic lakes during the 21st century: An analysis with process-based models of lake evolution and biogeochemistry

Tan, Zeli; Zhuang, Qianlai

doi:10.1002/2015JG003184

Title: Methane emissions from pan-Arctic lakes during the 21st century: An analysis with process-based models of lake evolution and biogeochemistry

Journal Article · Wed Dec 09 00:00:00 EST 2015 · Journal of Geophysical Research. Biogeosciences

DOI:https://doi.org/10.1002/2015JG003184· OSTI ID:1469113

Tan, Zeli ^[1]; Zhuang, Qianlai ^[2]

Purdue Univ., West Lafayette, IN (United States). Dept. of Earth, Atmospheric, and Planetary Sciences; Purdue Univ., West Lafayette, IN (United States). Purdue Climate Change Research Center
Purdue Univ., West Lafayette, IN (United States). Dept. of Earth, Atmospheric, and Planetary Sciences; Purdue Univ., West Lafayette, IN (United States). Purdue Climate Change Research Center, and Dept. of Agronomy

Abstract The importance of methane emissions from pan‐Arctic lakes in the global carbon cycle has been suggested by recent studies. These studies indicated that climate change influences this methane source mainly in two ways: the warming of lake sediments and the evolution of thermokarst lakes. Few studies have been conducted to quantify the two impacts together in a unified modeling framework. Here we adapt a region‐specific lake evolution model to the pan‐Arctic scale and couple it with a lake methane biogeochemical model to quantify the change of this freshwater methane source in the 21st century. Our simulations show that the extent of thaw lakes will increase throughout the 21st century in the northern lowlands of the pan‐Arctic where the reworking of epigenetic ice in drained lake basins will continue. The projected methane emissions by 2100 are 28.3 ± 4.5 Tg CH ₄ yr ⁻¹ under a low warming scenario (Representative Concentration Pathways (RCPs) 2.6) and 32.7 ± 5.2 Tg CH ₄ yr ⁻¹ under a high warming scenario (RCP 8.5), which are about 2.5 and 2.9 times the simulated present‐day emissions. Most of the emitted methane originates from nonpermafrost carbon stock. For permafrost carbon, the methanogenesis will mineralize a cumulative amount of 3.4 ± 0.8 Pg C under RCP 2.6 and 3.9 ± 0.9 Pg C under RCP 8.5 from 2006 to 2099. The projected emissions could increase atmospheric methane concentrations by 55.0–69.3 ppb. This study further indicates that the warming of lake sediments dominates the increase of methane emissions from pan‐Arctic lakes in the future.

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Research Organization:: Purdue Univ., West Lafayette, IN (United States); Univ. of California, Oakland, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: FG02-08ER64599; AC02-05CH11231; DE‐FG02‐08ER64599

OSTI ID:: 1469113

Alternate ID(s):: OSTI ID: 1402311

Journal Information:: Journal of Geophysical Research. Biogeosciences, Vol. 120, Issue 12; ISSN 2169-8953

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 36 works

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