Weather and Climate

Monitoring of snowline altitude at the end of melting season in Tianshan Mountains from 1991 to 2021

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  • 1. Hunan Provincial Key Laboratory of Geo-Information Engineering in Surveying, Mapping and Remote Sensing, Hunan University of Science and Technology, Xiangtan 411201, Hunan, China
    2. Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, State Key Laboratory of Cryospheric Sciences, Lanzhou 730000, Gansu, China

Received date: 2022-03-15

  Revised date: 2022-06-14

  Online published: 2022-10-25

Abstract

The study of snowline altitude changes at the end of the melting season is helpful to predict future trends of snow systems in order to understand the regional and global climate changes. The remote sensing extraction method of region snowline altitude was developed based on the Google Earth Engine and Landsat satellite data. From 1991 to 2021, the snowline altitude at the end of the melting season in the four basins of the Tianshan Mountains was extracted. The variation characteristics of snowline altitude and its relationship with meteorological factors were carefully and accurately estimated. The results were as follows: (1) the extended snowline altitude at the end of the melting season correlated well with the snow cover extent (minimum) at end of the melting season, which was extracted by Sentinel-2. The overall accuracy was 91.6%, and the Kappa coefficient was higher than 0.9. The regional snowline altitude at the end of the melting season was accurately obtained with this model. (2) Generally, the snowline altitude at the end of the melting season in the study area showed an obvious increasing trend over the last 30 years. The increase rate was between 2.7 m·a-1 and 6.4 m·a-1. The rise rate of the snowline altitude in the Manas River Basin was the fastest (6.4 m·a-1), while the rise rate of the snowline altitude in the Akeyazi River Basin was the slowest (2.7 m·a-1). (3) The summer temperature was the main factor that affected the change in the snowline altitude at the end of the melting season in the study area (P < 0.05), while the effect of precipitation was relatively weak.

Cite this article

WANG Jingwen,TANG Zhiguang,DENG Gang,HU Guojie,SANG Guoqing . Monitoring of snowline altitude at the end of melting season in Tianshan Mountains from 1991 to 2021[J]. Arid Zone Research, 2022 , 39(5) : 1385 -1397 . DOI: 10.13866/j.azr.2022.05.05

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