DOI: 10.1038/ngeo2305
论文题名: Net regional methane sink in High Arctic soils of northeast Greenland
作者: Juncher Jørgensen C. ; Lund Johansen K.M. ; Westergaard-Nielsen A. ; Elberling B.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2015
卷: 8, 期: 1 起始页码: 20
结束页码: 23
语种: 英语
Scopus关键词: greenhouse gas
; growing season
; land cover
; Landsat
; methane
; tundra soil
; Arctic
; Greenland
; Zackenberg
英文摘要: Arctic tundra soils serve as potentially important but poorly understood sinks of atmospheric methane (CH4), a powerful greenhouse gas. Numerical simulations project a net increase in methane consumption in soils in high northern latitudes as a consequence of warming in the past few decades. Advances have been made in quantifying hotspots of methane emissions in Arctic wetlands, but the drivers, magnitude, timing and location of methane consumption rates in High Arctic ecosystems are unclear. Here, we present measurements of rates of methane consumption in different vegetation types within the Zackenberg Valley in northeast Greenland over a full growing season. Field measurements show methane uptake in all non-water-saturated landforms studied, with seasonal averages of-8.3 ± 3.7 μmol CH4 m-2 h-1 in dry tundra and-3.1 ± 1.6 μmol CH4 m-2 h-1 in moist tundra. The fluxes were sensitive to temperature, with methane uptake increasing with increasing temperatures. We extrapolate our measurements and published measurements from wetlands with the help of remote-sensing land-cover classification using nine Landsat scenes. We conclude that the ice-free area of northeast Greenland acts as a net sink of atmospheric methane, and suggest that this sink will probably be enhanced under future warmer climatic conditions. © 2014 Macmillan Publishers Limited. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106195
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Center for Permafrost (CENPERM), Department of Geosciences and Natural Resource Management, University of Copenhagen, Øster Voldgade 10, Copenhagen, Denmark
Recommended Citation:
Juncher Jørgensen C.,Lund Johansen K.M.,Westergaard-Nielsen A.,et al. Net regional methane sink in High Arctic soils of northeast Greenland[J]. Nature Geoscience,2015-01-01,8(1)