An inventory of active rock glaciers in the northern Tien Shan of China compiled using satellite SAR interferometry
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| Format: | Dataset Open Access |
| Langue: | en |
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PANGAEA
2017
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| _version_ | 1867171847666139136 |
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| author | Wang, Xiaowen Liu, Lin Zhao, Lin Wu, Tonghua Li, Zhongqin Liu, Guoxiang |
| author_facet | Wang, Xiaowen Liu, Lin Zhao, Lin Wu, Tonghua Li, Zhongqin Liu, Guoxiang |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_874616 |
| institution | PANGAEA |
| language | en |
| publishDate | 2017 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | 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 ALTITUDE; Aspect; Aspect ratio; Identification; LATITUDE; LONGITUDE; Northern Tien Shan; NTS; Permafrost zonation index; Potential incoming solar radiation; Rock glacier area; Rock glacier length; Rock glacier surface velocity; Rock glacier surface velocity, uncertainty; SAT; Satellite remote sensing; Satellite SAR interferometry; Slope; Temperature, air, annual mean; Tien Shan, China 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. |
| title | An inventory of active rock glaciers in the northern Tien Shan of China compiled using satellite SAR interferometry |
| topic | ALTITUDE; Aspect; Aspect ratio; Identification; LATITUDE; LONGITUDE; Northern Tien Shan; NTS; Permafrost zonation index; Potential incoming solar radiation; Rock glacier area; Rock glacier length; Rock glacier surface velocity; Rock glacier surface velocity, uncertainty; SAT; Satellite remote sensing; Satellite SAR interferometry; Slope; Temperature, air, annual mean; Tien Shan, China |
| url | https://doi.org/10.1594/PANGAEA.874616 |