气候变化领域集成服务门户(CCPortal): Snow cover controls seasonally frozen ground regime on the southern edge of Altai Mountains

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DOI	10.1016/j.agrformet.2020.108271
	Snow cover controls seasonally frozen ground regime on the southern edge of Altai Mountains
	Zhang, Wei; Shen, Yongping; Wang, Xiaoming; Kang, Shichang; Chen, An'an; Mao, Weiyi; Zhong, Xinyue
通讯作者	Zhang, W (通讯作者)，320 West Donggang Rd, Lanzhou 730000, Gansu, Peoples R China.
发表日期	2021
ISSN	0168-1923
EISSN	1873-2240
卷号	297
英文摘要	Snow cover and seasonally frozen ground (SFG) are the key cryospheric elements on the southern edge of Altai Mountains (SEAM). Quantifying the thermal effect of snow cover on the frozen ground remains challenging. Utilizing the datasets observed at Altai Kuwei Snow Station (AKSS) and by National Meteorological Stations of China Meteorological Administration (CMA), we evaluated the thermal effect of snow cover on SFG regime. The results observed by AKSS indicated that the energy exchange between the ground and atmosphere was significantly insulated by snow cover, resulting in a considerable temperature offset between the snow surface and the ground below. This offset reached a maximum of 12.8 degrees C for a snow depth of 50 cm, but decreased for snowpack depths of >70 cm, whereas the snow temperature lapse rate was systematically steeper in the upper snowpack than at depth. Snow cover was the dominating driver of inter-annual differences in the SFG regime, as represented by the annual maximum freezing depth and soil heat flux. The observed average soil heat loss rate increased from 2.68 to 5.86 W/m(2) on two occasions when the average snow depth decreased from 61.2 cm to 13.7 cm, resulting in an increase in maximum freezing depth of SFG from 69 cm to >250 cm soil depth. The results observed by CMA also demonstrate how snow cover controlled the SFG regime by warming the ground and inhibiting freezing of the soil column. Snow cover caused a 44.5-cm decline of annual maximum freezing depth during 1961-2015 period. SFG degradation between 1961 and 2015 was accompanied by increases in both air temperature and snow cover, with the former playing the dominant role. The correlation between snow cover and the ground-atmosphere temperature offset provides a new empirical method of evaluating the effective thermal effect of snow cover on SFG.
关键词	ACTIVE-LAYER THICKNESS THERMAL-CONDUCTIVITY LAND-SURFACE RIVER-BASIN SOIL MODEL PERMAFROST TEMPERATURE CLIMATE ENERGY
英文关键词	Snow cover; Seasonally frozen ground (SFG); Thermal effect; Altai Mountains
语种	英语
WOS研究方向	Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
WOS类目	Agronomy ; Forestry ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000608676000026
来源期刊	AGRICULTURAL AND FOREST METEOROLOGY
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/254717
作者单位	[Zhang, Wei; Shen, Yongping; Wang, Xiaoming; Kang, Shichang; Zhong, Xinyue] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Cryospher Sci, Altai Kuwei Snow Stn, Lanzhou 730000, Gansu, Peoples R China; [Kang, Shichang] CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China; [Chen, An'an] Northwest Univ, Coll Urban & Environm Sci, Xian 710127, Shanxi, Peoples R China; [Mao, Weiyi] China Meteorol Adm, Urumqi Inst Desert Meteorol, Urumqi 830002, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Wei,Shen, Yongping,Wang, Xiaoming,et al. Snow cover controls seasonally frozen ground regime on the southern edge of Altai Mountains[J]. 中国科学院西北生态环境资源研究院,2021,297.
APA	Zhang, Wei.,Shen, Yongping.,Wang, Xiaoming.,Kang, Shichang.,Chen, An'an.,...&Zhong, Xinyue.(2021).Snow cover controls seasonally frozen ground regime on the southern edge of Altai Mountains.AGRICULTURAL AND FOREST METEOROLOGY,297.
MLA	Zhang, Wei,et al."Snow cover controls seasonally frozen ground regime on the southern edge of Altai Mountains".AGRICULTURAL AND FOREST METEOROLOGY 297(2021).