Rapid deceleration in the ice-flow velocity of the Shirase Glacier ice tongue and its influence on the velocity field: Observations from Sentinel-1 C-SAR

IF 1.5 4区地球科学 Q3 ECOLOGY

Polar Science Pub Date : 2024-08-24 DOI:10.1016/j.polar.2024.101109

S. Ohkawa, K. Doi, K. Nakamura, Y. Aoyama, H. Nagai

引用次数: 0

Abstract

Temporal and spatial variations in the ice-flow speed of Shirase Glacier ice tongue in East Antarctica between July 2018 and December 2021 were investigated using Sentinel-1 C-band Synthetic Aperture Radar (C-SAR) imagery. We identified pronounced slowdown events in the eastern part of the outer ice tongue, 30–40 km from the grounding line in 2020 and 55 km in 2021. Comparison of ice thickness and bathymetry in areas where the deceleration events occurred suggests that the events were caused by icebergs grounding or landing on the seafloor. The absence of slowdown propagation towards the grounding line demonstrates the ice tongue offers very limited buttressing. This study contributes to a better understanding of the factors influencing glacier dynamics, particularly in the context of grounding events and their localized impacts.

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白濑冰川冰舌冰流速度的快速减速及其对速度场的影响：来自哨兵-1 C-SAR 的观测数据

利用哨兵-1 C 波段合成孔径雷达（C-SAR）图像研究了 2018 年 7 月至 2021 年 12 月期间南极洲东部白濑冰川冰舌冰流速度的时空变化。我们在外层冰舌东部发现了明显的减速事件，2020 年在距接地线 30-40 公里处，2021 年在距接地线 55 公里处。对发生减速事件区域的冰层厚度和水深进行比较后发现，减速事件是由冰山接地或着陆到海底引起的。向接地线方向没有减速传播表明冰舌提供的支撑非常有限。这项研究有助于更好地了解影响冰川动力学的因素，特别是在接地事件及其局部影响方面。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Polar Science ECOLOGY-GEOSCIENCES, MULTIDISCIPLINARY

CiteScore

3.90

自引率

5.60%

发文量

期刊介绍： Polar Science is an international, peer-reviewed quarterly journal. It is dedicated to publishing original research articles for sciences relating to the polar regions of the Earth and other planets. Polar Science aims to cover 15 disciplines which are listed below; they cover most aspects of physical sciences, geosciences and life sciences, together with engineering and social sciences. Articles should attract the interest of broad polar science communities, and not be limited to the interests of those who work under specific research subjects. Polar Science also has an Open Archive whereby published articles are made freely available from ScienceDirect after an embargo period of 24 months from the date of publication. - Space and upper atmosphere physics - Atmospheric science/climatology - Glaciology - Oceanography/sea ice studies - Geology/petrology - Solid earth geophysics/seismology - Marine Earth science - Geomorphology/Cenozoic-Quaternary geology - Meteoritics - Terrestrial biology - Marine biology - Animal ecology - Environment - Polar Engineering - Humanities and social sciences.