摘要
格陵兰冰盖占全球总冰量的10%,其周围分布着许多溢出冰川,冰川消融会使更多的冰注入大海。本文基于96景Sentinel-1A数据,采用偏移跟踪算法获取2019—2022年彼得曼冰川表面流速,对冰川表面运动特征、季节性及年度变化进行分析。结果表明,彼得曼冰川表面流速呈现明显的季节性变化,夏季流速高,春、秋、冬季流速低,冰川剖面线流速明显快于两侧;2019—2022年冰川主体区域平均流速稳定,上游部分变化趋势一致,2021和2022年冰川主体部分冰流速较2019和2020年快,且高流速持续的时间更长;气温、降水量及风速促进了冰川表面流速运动,而海平面气压对冰川流速有抑制作用。从相关性来看,气温效应最为显著,风速次之,降水量影响最小。
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.
作者
田康
王志勇
李振今
张保敬
孙士昌
TIAN Kang;WANG Zhiyong;LI Zhenjin;ZHANG Baojing;SUN Shichang(College of Geodesy and Geomatics,Shandong University of Science and Technology,Qingdao 266590,China)
出处
《测绘通报》
CSCD
北大核心
2024年第7期35-40,54,共7页
Bulletin of Surveying and Mapping
基金
国家自然科学基金(41876202)。
关键词
彼得曼冰川
偏移跟踪
冰流速
季节年度变化
气象因子影响
Petermann Glacier
offset tracking
ice velocity
seasonal annual variations
influence of meteorological factors
作者简介
田康(1998-),男,硕士生,研究方向为微波遥感。E-mail:tiankang0036@163.com;通信作者:王志勇。E-mail:wzywlp@163.com。
