干旱区生态环境知识资源中心(Arid): Cryostratigraphical studies of ground ice formation and distribution in a High Arctic polar desert landscape, Resolute Bay, Nunavut

Arid

DOI	10.1139/cjes-2020-0134
	Cryostratigraphical studies of ground ice formation and distribution in a High Arctic polar desert landscape, Resolute Bay, Nunavut
	Paquette, Michel; Fortier, Daniel; Lamoureux, Scott F.
通讯作者	Paquette, M
来源期刊	CANADIAN JOURNAL OF EARTH SCIENCES
ISSN	0008-4077
EISSN	1480-3313
出版年	2023
卷号	59 期号:11 页码:759-771
英文摘要	Ground ice distribution and abundance have wide-ranging effects on periglacial environments and possible impacts on climate change scenarios. In contrast, very few studies measure ground ice in the High Arctic, especially in polar deserts and where coarse surficial material complicates coring operations. Ground ice volumes and cryostructures were determined for eight sites in a polar desert, near Resolute Bay, Nunavut, chosen for their hydrogeomorphic classification. Dry, unvegetated polar desert sites exhibited ice content close to soil porosity, with a <45 cm thick ice-enriched transition zone. In wetland sites, suspended cryostructures and ice dominated cryofacies (ice content at least 2x soil porosity values) were prevalent in the upper similar to 2 m of permafrost. Average ground ice saturation at those locations exceeded porosity values by a factor between 1.8 and 20.1 and by up to two orders of magnitude at the similar to 10 cm vertical scale. Sites with the highest ice contents were historically submerged wetlands with a history of sediment supply, sustained water availability, and syngenetic and quasi-syngenetic permafrost aggradation. Ice enrichment in those environments were mainly caused by the strong upward freezing potential beneath the thaw front, which, combined with abundant water supply, caused ice aggradation and frost heaving to form lithalsa plateaus. Most of the sites already expressed cryostratigraphic evidence of permafrost degradation. Permafrost degradation carries important ecological ramifications, as wetland locations are the most productive, life-supporting oases in the otherwise relatively barren landscape, carrying essential functions linked with hydrological processes and nutrient and contaminant cycling.
英文关键词	ground ice polar desert permafrost Arctic geocryology geomorphology
类型	Article
语种	英语
开放获取类型	Green Accepted
收录类别	SCI-E
WOS记录号	WOS:001081158100002
WOS关键词	FOSHEIM PENINSULA ; ACTIVE-LAYER ; HYDROLOGICAL PROCESSES ; CORNWALLIS-ISLAND ; ELLESMERE-ISLAND ; PERMAFROST ; COAST ; THERMOKARST ; TERRAIN ; CARBON
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/2XILL650/395635
推荐引用方式 GB/T 7714	Paquette, Michel,Fortier, Daniel,Lamoureux, Scott F.. Cryostratigraphical studies of ground ice formation and distribution in a High Arctic polar desert landscape, Resolute Bay, Nunavut[J],2023,59(11):759-771.
APA	Paquette, Michel,Fortier, Daniel,&Lamoureux, Scott F..(2023).Cryostratigraphical studies of ground ice formation and distribution in a High Arctic polar desert landscape, Resolute Bay, Nunavut.CANADIAN JOURNAL OF EARTH SCIENCES,59(11),759-771.
MLA	Paquette, Michel,et al."Cryostratigraphical studies of ground ice formation and distribution in a High Arctic polar desert landscape, Resolute Bay, Nunavut".CANADIAN JOURNAL OF EARTH SCIENCES 59.11(2023):759-771.