气候变化领域集成服务门户(CCPortal): A new map of permafrost distribution on the Tibetan Plateau

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DOI	10.5194/tc-11-2527-2017
	A new map of permafrost distribution on the Tibetan Plateau
	Zou D.; Zhao L.; Sheng Y.; Chen J.; Hu G.; Wu T.; Wu J.; Xie C.; Wu X.; Pang Q.; Wang W.; Du E.; Li W.; Liu G.; Li J.; Qin Y.; Qiao Y.; Wang Z.; Shi J.; Cheng G.
发表日期	2017
ISSN	19940416
卷号	11 期号:6
英文摘要	The Tibetan Plateau (TP) has the largest areas of permafrost terrain in the mid- and low-latitude regions of the world. Some permafrost distribution maps have been compiled but, due to limited data sources, ambiguous criteria, inadequate validation, and deficiency of high-quality spatial data sets, there is high uncertainty in the mapping of the permafrost distribution on the TP. We generated a new permafrost map based on freezing and thawing indices from modified Moderate Resolution Imaging Spectroradiometer (MODIS) land surface temperatures (LSTs) and validated this map using various ground-based data sets. The soil thermal properties of five soil types across the TP were estimated according to an empirical equation and soil properties (moisture content and bulk density). The temperature at the top of permafrost (TTOP) model was applied to simulate the permafrost distribution. Permafrost, seasonally frozen ground, and unfrozen ground covered areas of 1.06ĝ€ × ĝ€106ĝ€km2 (0.97-1.15ĝ€ × ĝ€106ĝ€km2, 90ĝ€% confidence interval) (40ĝ€%), 1.46ĝ€ × ĝ€106 (56ĝ€%), and 0.03ĝ€ × ĝ€106ĝ€km2 (1ĝ€%), respectively, excluding glaciers and lakes. Ground-based observations of the permafrost distribution across the five investigated regions (IRs, located in the transition zones of the permafrost and seasonally frozen ground) and three highway transects (across the entire permafrost regions from north to south) were used to validate the model. Validation results showed that the kappa coefficient varied from 0.38 to 0.78 with a mean of 0.57 for the five IRs and 0.62 to 0.74 with a mean of 0.68 within the three transects. Compared with earlier studies, the TTOP modelling results show greater accuracy. The results provide more detailed information on the permafrost distribution and basic data for use in future research on the Tibetan Plateau permafrost.
学科领域	accuracy assessment; data set; ground-based measurement; land surface; model validation; MODIS; permafrost; soil property; spatial data; transect; uncertainty analysis
语种	英语
scopus关键词	accuracy assessment; data set; ground-based measurement; land surface; model validation; MODIS; permafrost; soil property; spatial data; transect; uncertainty analysis
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/119313
作者单位	Cryosphere Research Station on Qinghai-Xizang Plateau, State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources (NIEER), Chinese Academy of Sciences (CAS), Lanzhou, 730000, China; State Key Laboratory of Frozen Soil Engineering, NIEER, CAS, Lanzhou, 730000, China
推荐引用方式 GB/T 7714	Zou D.,Zhao L.,Sheng Y.,et al. A new map of permafrost distribution on the Tibetan Plateau[J],2017,11(6).
APA	Zou D..,Zhao L..,Sheng Y..,Chen J..,Hu G..,...&Cheng G..(2017).A new map of permafrost distribution on the Tibetan Plateau.Cryosphere,11(6).
MLA	Zou D.,et al."A new map of permafrost distribution on the Tibetan Plateau".Cryosphere 11.6(2017).