Analysis of surface movement characteristics and seasonal annual variation of Petermann Glacier in Greenland
The Greenland ice sheet,which accounts for 10％of the world's total ice,is surrounded by many overflowing glaciers,and melting glaciers will cause more ice to be pumped into the sea.Based on the data of 96 Sentinel-1A,the offset tracking algorithm is used to obtain the surface flow velocity of Petermann Glacier in 2019-2022,and the characteristics of glacier surface movement,seasonal and annual variations were analyzed.The results show that:①The surface flow velocity of Petermann Glacier shows obvious seasonal variations,with high flow velocity in summer and low flow velocity in spring,autumn and winter,and the flow velocity of the glacier profile line is significantly faster than that on both sides.②In 2019-2022,the average flow velocity of the main glacier area is stable,and the change trend of the upstream part is consistent,and the ice flow velocity of the main part of the glacier in 2021 and 2022 was faster than that in 2019 and 2020,and the high flow rate lasted longer.③Temperature,precipitation and wind speed promote the movement of glacier surface velocity,while sea level pressure inhibited glacier velocity.From the perspective of correlation,the effect of temperature is the most significant,followed by wind speed,and the effect of precipitation is the least.
Petermann Glacieroffset trackingice velocityseasonal annual variationsinfluence of meteorological factors
万方数据
维普
