Interannual and seasonal variation of flow velocity in Koxkar Baxi Glacier from 2014 to 2020北大核心CSCD

Glacier flow is a key factor in understanding the nature of glaciers, and it is also one of the main research contents of glacier dynamics, which can provide basic support for rational utilization of glacier resources and early warning of glacier disasters. There are many mountain glaciers located in the west of China. The study on the spatiotemporal variation of surface velocity of glaciers also has great significance for the social and economic development of the western China. Koxkar Baxi Glacier, locates on the southern slopes of the Tomur Peak, is a typical dendritic glacier. In order to obtain the conditions of Koxkar Baxi Glacier’flow rates and its variation to further reveal the future of the variation of glacier, the spatiotemporal variability of glacier velocity was surveyed using correlation(COSI-Corr)method on Landsat imagery from 2014 to 2020. The results show that: (1)The average annual flow velocity of the Koxkar Baxi Glacier was 0. 04~0. 05 m·d-1 during 2014 to 2020. (2)The glacier reaches its maximum flow velocity near the center part, and the velocity decreased towards both lateral margins. In a longitudinal profile, ice flow velocity in the accumulation area increased down to the equilibrium line, while decreased towards the glacier terminal. The maximum velocity with 0. 17~ 0. 20 m·d-1 was found near the equilibrium line altitude. (3)The glacier flow velocity in warm seasons were 16. 67% faster than that in cold seasons. (4)The glacier flow velocity from 2014 to 2020 showed a slight decreasing trend, and the average flow velocity decreased 0. 01 m·d-1. (5)Temperature and precipitation had certain influence on the seasonal fluctuation and interannual variation of the flow velocity of the glacier. © 2022 Science Press (China). All rights reserved.

Interannual and seasonal variation of flow velocity in Koxkar Baxi Glacier from 2014 to 2020

Glacier flow is a key factor in understanding the nature of glaciers， and it is also one of the main research contents of glacier dynamics， which can provide basic support for rational utilization of glacier resources and early warning of glacier disasters. There are many mountain glaciers located in the west of China. The study on the spatiotemporal variation of surface velocity of glaciers also has great significance for the social and economic development of the western China. Koxkar Baxi Glacier， locates on the southern slopes of the Tomur Peak， is a typical dendritic glacier. In order to obtain the conditions of Koxkar Baxi Glacier’ flow rates and its variation to further reveal the future of the variation of glacier， the spatiotemporal variability of glacier velocity was surveyed using correlation （COSI-Corr） method on Landsat imagery from 2014 to 2020. The results show that： （1） The average annual flow velocity of the Koxkar Baxi Glacier was 0.04~0.05 m·d^-1 during 2014 to 2020. （2） The glacier reaches its maximum flow velocity near the center part， and the velocity decreased towards both lateral margins. In a longitudinal profile， ice flow velocity in the accumulation area increased down to the equilibrium line， while decreased towards the glacier terminal. The maximum velocity with 0.17~0.20 m·d^-1 was found near the equilibrium line altitude. （3） The glacier flow velocity in warm seasons were 16.67% faster than that in cold seasons. （4） The glacier flow velocity from 2014 to 2020 showed a slight decreasing trend， and the average flow velocity decreased 0.01 m·d^-1. （5） Temperature and precipitation had certain influence on the seasonal fluctuation and interannual variation of the flow velocity of the glacier.