期刊
PERMAFROST AND PERIGLACIAL PROCESSES
卷 21, 期 2, 页码 117-135出版社
WILEY
DOI: 10.1002/ppp.690
关键词
permafrost; ground temperature regime; climate change; permafrost thaw; active layer; International Polar Year; North America
资金
- Natural Resources Canada
- University of Ottawa
- Carleton University
- Centre d'etudes nordiques of Universite Laval
- Federal Government of Canada
- Northern Energy Development Initiative
- Program for Energy Research and Development
- Polar Continental Shelf Project
- The Natural Sciences and Engineering Research Council of Canada
- Canadian Foundation for Climate and Atmospheric Sciences
- Ministere des transports du Quebec
- Archer Cathro Resources
- Enbridge Pipelines (NW) Inc.
- Indian Northern Affairs Canada, Environment Canada
- Department of National Defence, Government of Nunavut, Parks Canada
- Yukon Parks
- Aurora Research Institute
- Yukon Geological Survey
- U.S. National Science Foundation [ARC-0520578, ARC-0632400, ARC-0612533, ARC-0856864]
- State of Alaska
- U.S. Geological Survey's Global Change Program
- U.S. Department of the Interior
A snapshot of the thermal state of permafrost in northern North America during the international Polar Year (IPY) was developed using ground temperature data collected from 350 boreholes. More than half these were established during IPY to enhance the network in sparsely monitored regions. The measurement sites span a diverse range of ecoclimatic and geological conditions across the continent and are at various elevations within the Cordillera. The ground temperatures within the discontinuous permafrost zone are generally above -3 degrees C, and range down to -15 degrees C in the continuous zone. Ground temperature envelopes vary according to substrate, with shallow depths of zero annual amplitude for peat and mineral soils, and much greater depths for bedrock. New monitoring sites in the mountains of southern and central Yukon suggest that permafrost may be limited in extent. In concert with regional air temperatures, permafrost has generally been warming across North America for the past several decades, as indicated by measurements from the western Arctic since the 1970s and from parts of eastern Canada since the early 1990s. The rates of ground warming have been variable, but are generally greater north of the treeline. Latent heat effects in the southern discontinuous zone dominate the permafrost thermal regime close to 0 degrees C and allow permafrost to persist under a warming climate. Consequently, the spatial diversity of permafrost thermal conditions is decreasing over time. Copyright (C) 2010 Crown in the right of Canada and John Wiley & Sons, Ltd.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据