干旱区生态环境知识资源中心(Arid): Impacts of Degrading Ice-Wedges on Ground Temperatures in a High Arctic Polar Desert System

Arid

DOI	10.1029/2019JF005173
	Impacts of Degrading Ice-Wedges on Ground Temperatures in a High Arctic Polar Desert System
	Jones, Melissa K. Ward; Pollard, Wayne H.; Amyot, Frances
通讯作者	Jones, Melissa K. Ward
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
ISSN	2169-9003
EISSN	2169-9011
出版年	2020
卷号	125 期号:3
英文摘要	Ice-wedge ice is the most widespread type of massive ice found in the continuous permafrost zone. Polygonal networks of ice-wedges drive environmental changes and feedback that will likely be exacerbated with future climate change. Recent decadal-scale observations have shown that ice-wedges are degrading rapidly within the entire Circum-Arctic Region but observations of feedback associated with ground temperature regimes are still lacking in many areas. We present over a year's worth of field observations from an area with cold (-16.5 degrees C), thick (>500 m) continuous permafrost and a mean annual air temperature of -19.7 degrees C in the Canadian high Arctic. Topographic surveys, thaw depths, vegetation cover, soil moisture, and annual shallow (12 cm) ground temperature measurements were collected for seven ice-wedge troughs and two polygon centers in a high-centered polygon system. We show that geomorphic changes caused by ice-wedge degradation generate new responses in soil moisture, vegetation cover, and snow distribution that create a mosaic of ground temperatures that range by 5.1 degrees C for mean annual, 2.5 degrees C in summer, and 15.2 degrees C in winter between polygon-centers and ice-wedge troughs. Our results show that snow redistribution due to wind induces the cooling of polygon centers, thus promoting new thermal contraction cracking and ice-wedge formation. We provide an example based on high-resolution remote sensing data on how these ice-wedge trough densities vary spatially in our study area. Capturing these fine scale geomorphic differences and resulting ground temperatures will be critical to accurately assess future changes of these common Arctic landscapes.
英文关键词	ice-wedges permafrost thermokarst Ellesmere Island high Arctic ground thermal regimes
类型	Article
语种	英语
国家	Canada
收录类别	SCI-E
WOS记录号	WOS:000522071000004
WOS关键词	WARMING PERMAFROST ; FOSHEIM PENINSULA ; THERMAL REGIME ; ACTIVE-LAYER ; BYLOT ISLAND ; YUKON COAST ; DEGRADATION ; THERMOKARST ; CLIMATE ; DYNAMICS
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/314974
作者单位	McGill Univ, Dept Geog, Montreal, PQ, Canada
推荐引用方式 GB/T 7714	Jones, Melissa K. Ward,Pollard, Wayne H.,Amyot, Frances. Impacts of Degrading Ice-Wedges on Ground Temperatures in a High Arctic Polar Desert System[J],2020,125(3).
APA	Jones, Melissa K. Ward,Pollard, Wayne H.,&Amyot, Frances.(2020).Impacts of Degrading Ice-Wedges on Ground Temperatures in a High Arctic Polar Desert System.JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE,125(3).
MLA	Jones, Melissa K. Ward,et al."Impacts of Degrading Ice-Wedges on Ground Temperatures in a High Arctic Polar Desert System".JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE 125.3(2020).