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短期的冰川面积变化,冰川几何依赖性,以及区域气候变化强迫,乔治王岛,南极洲

Júlia L Lorenz¹, Kátia K DA Rosa¹, Carina Petsch^1,2

¹Universidade Federal do Rio Grande do Sul, Centro Polar e Climático, Avenida Bento Gonçalves, 9500, Agronomia, 91501-970 Porto Alegre, RS, Brasil.

Anais da Academia Brasileira de Ciencias

|December 6, 2023

概括

自1988年以来,乔治国王岛的冰川面积减少了104.9平方公里,并且观察到显著的退缩. 冰川面积的减少与诸如海拔升高和大气温度升温等因素有关.

科学领域:

冰川学的冰川学
气候科学气候科学
遥感遥感遥感遥感

背景情况:

乔治王岛的冰原经历了重大的变化.
了解冰川动态对于气候变化监测至关重要.

研究的目的:

在2020年夏天调查过渡性雪线 (TSL) 高度.
自1988年以来,对乔治王岛的冰川面积损失进行量化.
分析大气趋势及其对冰川变化的影响.

主要方法:

利用卫星Sentinel-1,Sentinel-2和LandsatTM的图像进行冰川区域分析.
使用ERA5重新分析数据来检查大气温度和风力模式.
使用雷达回散值 (≤-13dB) 定义的湿雪区.

主要成果:

在1988年至2020年期间,冰川面积损失总计为104.9平方公里 (3.17平方公里/年).
2020年,44.3%的冰川面积高于短暂的雪线 (≥300米).
凯勒半岛和贝林斯豪森圆顶冰川的面积损失最高 (28%和17%).
面积损失与冰川尺寸,海拔和TSL附近的降低相关.
大气温度的升温在布兰斯菲尔德海峡更为明显.

结论:

冰川的撤退和TSL变化受气候和海洋学因素的影响.
较小的冰川和那些流入更深处的冰川经历了更大的变化.
这项研究强调了乔治王岛冰川对气候变化的脆弱性.

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