Arid
DOI10.1029/2019JF005173
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
ISSN2169-9003
EISSN2169-9011
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).
条目包含的文件
条目无相关文件。
个性服务
推荐该条目
保存到收藏夹
导出为Endnote文件
谷歌学术
谷歌学术中相似的文章
[Jones, Melissa K. Ward]的文章
[Pollard, Wayne H.]的文章
[Amyot, Frances]的文章
百度学术
百度学术中相似的文章
[Jones, Melissa K. Ward]的文章
[Pollard, Wayne H.]的文章
[Amyot, Frances]的文章
必应学术
必应学术中相似的文章
[Jones, Melissa K. Ward]的文章
[Pollard, Wayne H.]的文章
[Amyot, Frances]的文章
相关权益政策
暂无数据
收藏/分享

除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。