气候变化领域集成服务门户(CCPortal): Improving Permafrost Physics in a Distributed Cryosphere-Hydrology Model and Its Evaluations at the Upper Yellow River Basin

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DOI	10.1029/2020JD032916
	Improving Permafrost Physics in a Distributed Cryosphere-Hydrology Model and Its Evaluations at the Upper Yellow River Basin
	Song, Lei; Wang, Lei; Li, Xiuping; Zhou, Jing; Luo, Dongliang; Jin, Huijun; Qi, Jia; Zeng, Tian; Yin, Yuanyuan
通讯作者	Wang, L (通讯作者)
发表日期	2020
ISSN	2169-897X
EISSN	2169-8996
卷号	125 期号:18
英文摘要	Frozen soil undergoing freeze-thaw cycles has effects on local hydrology, ecosystems, and engineering infrastructure by global warming. It is important to clarify the hydrological processes of frozen soil, especially permafrost. In this study, the performance of a distributed cryosphere-hydrology model (WEB-DHM, Water and Energy Budget-based Distributed Hydrological Model) was significantly improved by the addition of enthalpy-based permafrost physics. First, we formulated the water phase change in the unconfined aquifer and its exchanges of water and heat with the upper soil layers, with enthalpy adopted as a prognostic variable instead of soil temperature in the energy balance equation to avoid instability when calculating water phase changes. Second, more reasonable initial conditions for the bottom soil layer (overlying the unconfined aquifer) were considered. The improved model (hereinafter WEB-DHM-pf) was carefully evaluated at three sites with seasonally frozen ground and one permafrost site over the Qinghai-Tibetan Plateau (the Third Pole), to demonstrate the capability of predicting the internal processes of frozen soil at the point scale, particularly the zero-curtain phenomenon in permafrost. Four different experiments were conducted to assess the impacts of augmentation of single model improvement on simulating soil water/ice and temperature dynamics in frozen soil. Finally, the WEB-DHM-pf was demonstrated to be capable of accurately reproducing the zero curtain, detecting long-term changes in frozen soil at the point scale, and discriminating basin-wide permafrost from seasonally frozen ground in a basin at the headwaters of the Yellow River.
关键词	QINGHAI-TIBET PLATEAU GROUND SURFACE-TEMPERATURE SOIL-MOISTURE THERMAL REGIME SOURCE AREAS COLD REGION CLIMATE DEGRADATION SNOW DYNAMICS
英文关键词	cryosphere-hydrology model; permafrost; unconfined aquifer; soil temperature and moisture; upper Yellow River Basin
语种	英语
WOS研究方向	Meteorology & Atmospheric Sciences
WOS类目	Meteorology & Atmospheric Sciences
WOS记录号	WOS:000576404200002
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
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/259788
推荐引用方式 GB/T 7714	Song, Lei,Wang, Lei,Li, Xiuping,et al. Improving Permafrost Physics in a Distributed Cryosphere-Hydrology Model and Its Evaluations at the Upper Yellow River Basin[J]. 中国科学院青藏高原研究所,2020,125(18).
APA	Song, Lei.,Wang, Lei.,Li, Xiuping.,Zhou, Jing.,Luo, Dongliang.,...&Yin, Yuanyuan.(2020).Improving Permafrost Physics in a Distributed Cryosphere-Hydrology Model and Its Evaluations at the Upper Yellow River Basin.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,125(18).
MLA	Song, Lei,et al."Improving Permafrost Physics in a Distributed Cryosphere-Hydrology Model and Its Evaluations at the Upper Yellow River Basin".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 125.18(2020).