气候变化领域集成服务门户(CCPortal): Soil moisture redistribution and its effect on inter-annual active layer temperature and thickness variations in a dry loess terrace in Adventdalen, Svalbard

CCPortal

DOI	10.5194/tc-11-635-2017
	Soil moisture redistribution and its effect on inter-annual active layer temperature and thickness variations in a dry loess terrace in Adventdalen, Svalbard
	Schuh C.; Frampton A.; Hvidtfeldt Christiansen H.
发表日期	2017
ISSN	19940416
卷号	11 期号:1
英文摘要	High-resolution field data for the period 2000-2014 consisting of active layer and permafrost temperature, active layer soil moisture, and thaw depth progression from the UNISCALM research site in Adventdalen, Svalbard, is combined with a physically based coupled cryotic and hydrogeological model to investigate active layer dynamics. The site is a loess-covered river terrace characterized by dry conditions with little to no summer infiltration and an unsaturated active layer. A range of soil moisture characteristic curves consistent with loess sediments is considered and their effects on ice and moisture redistribution, heat flux, energy storage through latent heat transfer, and active layer thickness is investigated and quantified based on hydro-climatic site conditions. Results show that soil moisture retention characteristics exhibit notable control on ice distribution and circulation within the active layer through cryosuction and are subject to seasonal variability and site-specific surface temperature variations. The retention characteristics also impact unfrozen water and ice content in the permafrost. Although these effects lead to differences in thaw progression rates, the resulting inter-annual variability in active layer thickness is not large. Field data analysis reveals that variations in summer degree days do not notably affect the active layer thaw depths; instead, a cumulative winter degree day index is found to more significantly control inter-annual active layer thickness variation at this site. A tendency of increasing winter temperatures is found to cause a general warming of the subsurface down to 10 m depth (0.05 to 0.26 °Cyr-1, observed and modelled) including an increasing active layer thickness (0.8 cm yr-1, observed and 0.3 to 0.8 cm yr-1, modelled) during the 14-year study period.
学科领域	annual variation; crustal thickness; data assimilation; freeze-thaw cycle; frozen ground; hydrological modeling; latent heat flux; permafrost; soil moisture; soil temperature; Adventdalen; Arctic; Spitsbergen; Svalbard; Svalbard and Jan Mayen
语种	英语
scopus关键词	annual variation; crustal thickness; data assimilation; freeze-thaw cycle; frozen ground; hydrological modeling; latent heat flux; permafrost; soil moisture; soil temperature; Adventdalen; Arctic; Spitsbergen; Svalbard; Svalbard and Jan Mayen
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/119430
作者单位	Department of Physical Geography, Stockholm University, Stockholm, Sweden; Bolin Centre for Climate Change, Stockholm University, Stockholm, Sweden; Department of Arctic Geology, University Centre in Svalbard, Longyearbyen, Norway
推荐引用方式 GB/T 7714	Schuh C.,Frampton A.,Hvidtfeldt Christiansen H.. Soil moisture redistribution and its effect on inter-annual active layer temperature and thickness variations in a dry loess terrace in Adventdalen, Svalbard[J],2017,11(1).
APA	Schuh C.,Frampton A.,&Hvidtfeldt Christiansen H..(2017).Soil moisture redistribution and its effect on inter-annual active layer temperature and thickness variations in a dry loess terrace in Adventdalen, Svalbard.Cryosphere,11(1).
MLA	Schuh C.,et al."Soil moisture redistribution and its effect on inter-annual active layer temperature and thickness variations in a dry loess terrace in Adventdalen, Svalbard".Cryosphere 11.1(2017).