气候变化领域集成服务门户(CCPortal): Quantifying Overestimated Permafrost Extent Driven by Rock Glacier Inventory

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DOI	10.1029/2021GL092476
	Quantifying Overestimated Permafrost Extent Driven by Rock Glacier Inventory
	Cao, Bin; Li, Xin; Feng, Min; Zheng, Donghai
通讯作者	Li, X (通讯作者)
发表日期	2021
ISSN	0094-8276
EISSN	1944-8007
卷号	48 期号:8
英文摘要	Rock glaciers (RGs) are normally used as ground-truth observations to indicate the presence of permafrost, and hence extensively used in training permafrost distribution models. However, the unique structure and composition of RGs enhance ground cooling effects, leading to more favorable conditions for permafrost presence than in adjacent ground. We therefore hypothesized and confirmed that permafrost extent is overestimated using RG-driven models. The results indicate that the permafrost zonation index was overestimated by about 8.4%-13.1% in a model driven by RG observations compared to a model using in situ measurements of permafrost presence/absence. The bias is particularly pronounced in discontinuous permafrost region, where it is thought to be highly sensitive to climate change, resulting in about a 41.8%-90.8% overestimation in permafrost region and 7.0%-18.6% misclassification. In order to better use the large RG datasets available to understand permafrost conditions, we provide a method to correct this bias in a fundamental model.
关键词	TIBETAN PLATEAU EUROPEAN ALPS INDEX MAP MODEL PHYSICS SHAN
英文关键词	permafrost; rock glacier; scale effects
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000672324900084
来源期刊	GEOPHYSICAL RESEARCH LETTERS
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/260118
推荐引用方式 GB/T 7714	Cao, Bin,Li, Xin,Feng, Min,et al. Quantifying Overestimated Permafrost Extent Driven by Rock Glacier Inventory[J]. 中国科学院青藏高原研究所,2021,48(8).
APA	Cao, Bin,Li, Xin,Feng, Min,&Zheng, Donghai.(2021).Quantifying Overestimated Permafrost Extent Driven by Rock Glacier Inventory.GEOPHYSICAL RESEARCH LETTERS,48(8).
MLA	Cao, Bin,et al."Quantifying Overestimated Permafrost Extent Driven by Rock Glacier Inventory".GEOPHYSICAL RESEARCH LETTERS 48.8(2021).