Spatial and Temporal Variability of Glacier Surface Velocities and Outlet Areas on James Ross Island, Northern Antarctic Peninsula
Spatial and Temporal Variability of Glacier Surface
Velocities and Outlet Areas on James Ross Island,
Northern Antarctic Peninsula
复制标题
南极半岛北部詹姆斯罗斯岛冰川表面速度和出口区域的时空变化
DOI：
10.3390/geosciences9090374
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发表时间：
2019
期刊：
影响因子：
2.7
通讯作者：
Braun
中科院分区：
文献类型：
--
作者：
Lippl;Friedl;Kittel;Marinsek;Seehaus;Braun
南极半岛北部受到20世纪下半叶显著变暖和几个冰架坍塌的影响。在东北海岸的詹姆斯罗斯岛上，当地的气候条件可能与南极半岛的主要部分有很大的不同。本文报道了整个詹姆斯罗斯岛冰川表面速度及其出口面积的时空变化，并评估了与大气和海洋条件的潜在关系。速度估计是从2014至2018年间卫星合成孔径雷达传感器TerraSAR-X和Tandem-X的强度特征跟踪场景中提取的，并与地面观测结果进行了验证。利用1945年以来的冰川崩解锋位置，用共箱方法计算了冰川出口面积的变化。与1988-2009年相比，几乎所有研究的冰川崩解锋在2009-2014年和2014-2018年的年退缩速度都有所减慢，但它们的速度模式不同。对大气条件的分析无法解释速度和面积变化的不同模式。我们认为当地的水深条件对此有很大的影响。未来对海洋条件的调查对于深刻理解不同影响因素的叠加是必要的。
The northern Antarctic Peninsula was affected by a significant warming over the secondhalf of the 20th century and the collapse of several ice shelves. Local climate conditions on James RossIsland on the northeastern coast can differ strongly from the main part of the Antarctic Peninsula.This paper reports the spatial and temporal variability of glacier surface velocities and the area oftheir outlets throughout James Ross Island, and evaluates potential relationships with atmosphericand oceanic conditions. Velocity estimates were retrieved from intensity feature tracking of scenesfrom satellite synthetic aperture radar sensors TerraSAR-X and TanDEM-X between 2014 and 2018,which were validated against ground observations. Calving front positions back to 1945 were usedto calculate outlet area changes for the glaciers by using a common-box approach. The annualrecession rates of almost all investigated glacier calving fronts decelerated for the time periods2009–2014 and 2014–2018 in comparison to the period 1988–2009, but their velocity patterns differed.Analysis of atmospheric conditions failed to explain the different patterns in velocity and areachanges. We suggest a strong influence from local bathymetric conditions. Future investigations ofthe oceanic conditions would be necessary for a profound understanding of the super-position ofdifferent influencing factors.