Impacts of peat and vegetation on permafrost degradation under climate warming
Impacts of peat and vegetation on permafrost degradation under climate warming
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DOI：
10.1029/2007gl030550
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发表时间：
2007-08
影响因子：
5.2
通讯作者：
S. Yi;M. Woo;M. A. Arain
中科院分区：
文献类型：
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作者：
S. Yi;M. Woo;M. A. Arain
使用社区土地模型第 3 版 (CLM3) 和这些地点的随机历史气候记录，并与联合国政府间气候变化专门委员会 (IPCC) 排放情景报告 (SRES) A2 气候变化情景相叠加，对加拿大连续和不连续永久冻土地点的最大年度融化进行了模拟。为了应对气候变暖，模拟了 2000 年至 2100 年期间永久冻土退化的积极趋势。地表覆盖状况和土壤性质在影响地面融化方面起着主导作用。特别是，薄泥炭层或表面有机覆盖物可以显着缓冲永久冻土，防止严重退化。极地地区植被的出现以及泥炭和有机层的广泛存在将调节气候变暖对永久冻土融化的区域影响。
Simulations of maximum annual thaw at a continuous and a discontinuous permafrost site in Canada were performed using Community Land Model version 3 (CLM3) and randomized historical climate records from these sites, superimposed with United Nations Intergovernmental Panel on Climate Change (IPCC), Report on Emission Scenarios (SRES) A2 scenario of climate change. A positive trend in permafrost degradation was simulated for the 2000 to 2100 period in response to climate warming. Surface cover condition and soil properties play a dominant role in affecting ground thaw. In particular, a thin peat layer or surface organic cover can significantly buffer the permafrost against severe degradation. The occurrence of vegetation and extensive presence of a peat and organic layer in the circumpolar areas will modulate the regional impact of climate warming on permafrost thaw.