Confirmation of snowline in Western Tianshan Mountains based on different methods and analysis of its change rule
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Abstract:
In order to better guide the development and utilization of ice and snow resources in western Tianshan mountains, it is of great importance to study the law of snowline change. With the help of the MODIS datafrom 2000 to 2016, the weather datafrom 1959 to 2015, and the DEM data, west udied the temporal and spatial variation of the snowline in Kashi river basin by using the remote sensing snowline method, the climate snowline method, and the fields of snowline altitude method. The results are as follows: (1) According to the remote sensing snowline method, the multi-year average (8 days) and the annual average snowline showed a rising tendency in the resear charea; on the seasonal scale, the snowline showed a rising tendency in spring and winter, and showed a declining tendency in autumn and summer. Based on the climatic data, the annual average snowline had a good response to precipitation, and the spring snowline had a good response to temperature. (2) According to the climate snowline method, the climate snowline was higher than the remote sensing snowline. From the climate perspective, the climate change caused the snowline to increase year by year. (3) It is shown from the analysis of the fields of snowline altitude that the distribution of the snowline is mainly influenced by to pography. With the 2000m height as the dividing line, the two parts of the fields of snowline altitude have different responses to precipitation.
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