气候变化领域集成服务门户(CCPortal): An inventory of active rock glaciers in the northern Tien Shan of China compiled using satellite SAR interferometry

CCPortal

DOI	https://doi.org/10.1594/PANGAEA.874616
	An inventory of active rock glaciers in the northern Tien Shan of China compiled using satellite SAR interferometry
	Wang; Xiaowen; Liu; Lin; Zhao; Lin; Wu; Tonghua; Li; Zhongqin; Liu; Guoxiang
发布日期	2017-04-13
数据集类型	dataset
英文简介	Rock glaciers are widespread in the Tien Shan. However, rock glaciers in the Chinese part of the Tien Shan have not been systematically investigated for more than two decades. In this study, we propose a new method that combines SAR interferometry and optical images from Google Earth to map active rock glaciers (ARGs) in the Northern Tien Shan (NTS) of China. We compiled an inventory that includes 261 ARGs and quantitative information about their locations, geomorphic parameters, and down-slope velocities. Our inventory shows that most of the ARGs are moraine-derived (69 %) and facing northeast (56 %). The altitude distribution of ARGs in the western NTS is significantly different from those located in the eastern part. The down-slope velocities of the ARGs vary significantly in space, with a maximum of about 114 cm/yr and a mean of about 37 cm/yr. Using the ARG locations as a proxy for the extent of alpine permafrost, our inventory suggests that the lowest altitudinal limit for the presence of permafrost in the NTS is about 2500-2800 m, a range determined by the lowest ARG in the entire inventory and by a statistics-based estimation. The successful application of the proposed method would facilitate effective and robust efforts to map rock glaciers over mountain ranges globally. And this study provides an important dataset to improve mapping and modeling permafrost occurrence in vast western China.
空间范围	Median Latitude: 43.709585 * Median Longitude: 84.993124 * South-bound Latitude: 42.766300 * West-bound Longitude: 83.209600 * North-bound Latitude: 44.323400 * East-bound Longitude: 87.440400
语种	英语
国家	国际
学科大类	气候变化
学科子类	气候变化
文献类型	数据集
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/216525
推荐引用方式 GB/T 7714	Wang,Xiaowen,Liu,et al. An inventory of active rock glaciers in the northern Tien Shan of China compiled using satellite SAR interferometry.2017-04-13.https://doi.org/10.1594/PANGAEA.874616.