Long-term Circumpolar Active Layer Monitoring (CALM) program observations in Northern Alaskan tundra
Long-term Circumpolar Active Layer Monitoring (CALM) program observations in Northern Alaskan tundra
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DOI：
10.1080/1088937x.2021.1988000
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发表时间：
2021-10
期刊：
影响因子：
2.6
通讯作者：
K. Nyland;N. Shiklomanov;D. Streletskiy;F. Nelson;A. Klene;A. Kholodov
中科院分区：
文献类型：
--
作者：
K. Nyland;N. Shiklomanov;D. Streletskiy;F. Nelson;A. Klene;A. Kholodov
环极活动层监测（CALM）网络是一项持续的国际努力，旨在收集和传播活动层动力学的标准化测量结果，以监测近地表永久冻土参数对气候变化的响应。这项工作总结了 25 年（1995 年至 2019 年）阿拉斯加苔原环境 CALM 站点三个南北横断面的观测结果。这项工作中检查的横断面将苏厄德半岛不连续永久冻土的苔原地区以及北极山麓和北极沿海平原西部和东部的连续永久冻土带一分为二。这些样线代表区域气候梯度、几个自然地理省份和区域特征的土地覆盖关联。观察部位的总活性层增厚范围为 7 至 26 厘米；尽管气温升高的趋势不太明显，但山麓地区出现了更显着的解冻。本摘要强调了几个区域活动层对气候变暖的响应，并因独特的热景观敏感性、景观变化和记录的解冻沉降而变得复杂。本报告中总结的数据是公开的，是地球系统模型的重要验证资源，其中包括阿拉斯加北部和西部连续和不连续永久冻土区的区域。文章历史记录 2020 年 11 月 30 日收到 2021 年 9 月 28 日接受
The Circumpolar Active Layer Monitoring (CALM) network is an ongoing international effort to collect and disseminate standardized measurements of active-layer dynamics to monitor the response of near-surface permafrost parameters to climate change. This work presents a distillation of 25 years (1995–2019) of observations from three north–south transects of CALM sites in tundra environments of Alaska. Transects examined in this work bisect tundra regions of discontinuous permafrost on the Seward Peninsula, and the continuous permafrost zone on the western and eastern sections of the Arctic Foothills and Arctic Coastal Plain. These transects represent regional climatic gradients, several physiographic provinces, and regionally characteristic landcover associations. Total active-layer thickening at observed sites ranged from 7 to 26 cm; more significant thaw occurred in the foothills despite less pronounced warming air temperature trends. This summary highlights several regional active layer responses to climate warming, complicated by distinct thermal landscape sensitivities, landscape variability, and documented thaw subsidence. Data summarized in this report are publicly available and represent an important validation resource for earth-system models that include regions in the continuous and discontinuous permafrost zones of northern and western Alaska. ARTICLE HISTORY Received 30 November 2020 Accepted 28 September 2021