Morphological changes to the terminus of a maritime glacier during advance and retreat phases: Fox Glacier/Te Moeka o Tuawe, New Zealand

IF 1.4 4区地球科学 Q3 GEOGRAPHY, PHYSICAL

Geografiska Annaler Series A-Physical Geography Pub Date : 2020-11-29 DOI:10.1080/04353676.2020.1840179

H. Purdie, P. Bealing, Christopher A. Gomez, B. Anderson, O. Marsh

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引用次数: 2

Abstract

ABSTRACT Fox Glacier/Te Moeka o Tuawe is a fast-responding maritime glacier that has undergone multiple advance and retreat phases during recent decades. Here we use a combination of repeat photography, Structure from Motion (SfM), and ice discharge measurement, to identify key morphological differences associated with these repeated phase changes, and assess how much of the current terminus is still dynamically active. Increasing surface-debris cover at the margins and topographic shading result in the asymmetry of the retreating terminus, with central portions receding faster than the margins. In 2019, the glacier is shorter than at any time in recorded history, and ice flux is insufficient to sustain the current glacier length, with a further ∼300 m of the glacier terminus region potentially vulnerable to retreat. However, due to the high climate sensitivity of this maritime glacier, even a slight shift towards increasing mass flux could see this trend reverse.

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海洋冰川在前进和后退阶段末端的形态变化:新西兰福克斯冰川/Te Moeka o Tuawe

福克斯冰川是一个快速反应的海洋冰川，近几十年来经历了多个前进和后退阶段。在这里，我们结合使用重复摄影、运动结构(SfM)和冰流量测量，来识别与这些重复相位变化相关的关键形态差异，并评估当前末端仍有多少动态活动。边缘地表碎屑覆盖的增加和地形的遮荫导致了退缩末端的不对称性，中心部分的退缩速度比边缘快。2019年，该冰川比有记录以来的任何时候都要短，冰通量不足以维持目前的冰川长度，冰川终端区域还有约300米可能容易退缩。然而，由于这一海洋冰川对气候的高度敏感性，即使是向质量通量增加的轻微转变也可能使这一趋势逆转。

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来源期刊

Geografiska Annaler Series A-Physical Geography 地学-地质学

CiteScore

3.60

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： Geografiska Annaler: Series A, Physical Geography publishes original research in the field of Physical Geography with special emphasis on cold regions/high latitude, high altitude processes, landforms and environmental change, past, present and future. The journal primarily promotes dissemination of regular research by publishing research-based articles. The journal also publishes thematic issues where collections of articles around a specific themes are gathered. Such themes are determined by the Editors upon request. Finally the journal wishes to promote knowledge and understanding of topics in Physical Geography, their origin, development and current standing through invited review articles.