气候变化领域集成服务门户(CCPortal): On the freeze-thaw cycles of shallow soil and connections with environmental factors over the Tibetan Plateau

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DOI	10.1007/s00382-021-05860-3
	On the freeze-thaw cycles of shallow soil and connections with environmental factors over the Tibetan Plateau
	Li, Ning; Cuo, Lan; Zhang, Yongxin
通讯作者	Cuo, L (通讯作者)
发表日期	2021
ISSN	0930-7575
EISSN	1432-0894
起始页码	3183
结束页码	3206
卷号	57 期号:11-12
英文摘要	Changes in the freeze-thaw cycles of shallow soil have important consequences for surface and subsurface hydrology, land-atmosphere energy and moisture interaction, carbon exchange, and ecosystem diversity and productivity. This work examines the shallow soil freeze-thaw cycle on the Tibetan Plateau (TP) using in-situ soil temperature observations in 0-20 cm soil layer during July 1982-June 2017. The domain and layer averaged beginning frozen day is November 18 and delays by 2.2 days per decade; the ending frozen day is March 9 and advances by 3.2 days per decade; the number of frozen days is 109 and shortens by 5.2 days per decade. Altitude and latitude combined could explain the spatial patterns of annual mean freeze-thaw status well. Stations located near 0 degrees C contour line experienced dramatic changes in freeze-thaw cycles as seen from subtropical mountain coniferous forest in the southern TP. Soil completely freezes from surface to 20-cm depth in 15 days while completely thaws in 10 days on average. Near-surface soil displays more pronounced changes than deeper soil. Surface air temperature strongly influences the shallow soil freeze-thaw status but snow exerts limited effects. Different thresholds in freeze-thaw status definition lead to differences in the shallow soil freeze-thaw status and multiple-consecutive-day approach appears to be more robust and reliable. Gridded soil temperature products could resolve the spatial pattern of the observed shallow soil freeze-thaw status to some extent but further improvement is needed.
关键词	CLIMATE-CHANGE LAND-SURFACE GLOBAL PRECIPITATION WATER STORAGE TIME-SERIES SNOW COVER PERMAFROST TEMPERATURE DYNAMICS SYSTEM
英文关键词	Shallow soil; Freeze-thaw cycles; Environmental factors; The Tibetan Plateau
语种	英语
WOS研究方向	Meteorology & Atmospheric Sciences
WOS类目	Meteorology & Atmospheric Sciences
WOS记录号	WOS:000669176200001
来源期刊	CLIMATE DYNAMICS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260234
推荐引用方式 GB/T 7714	Li, Ning,Cuo, Lan,Zhang, Yongxin. On the freeze-thaw cycles of shallow soil and connections with environmental factors over the Tibetan Plateau[J]. 中国科学院青藏高原研究所,2021,57(11-12).
APA	Li, Ning,Cuo, Lan,&Zhang, Yongxin.(2021).On the freeze-thaw cycles of shallow soil and connections with environmental factors over the Tibetan Plateau.CLIMATE DYNAMICS,57(11-12).
MLA	Li, Ning,et al."On the freeze-thaw cycles of shallow soil and connections with environmental factors over the Tibetan Plateau".CLIMATE DYNAMICS 57.11-12(2021).