Surge-type glaciers in Kalaallit Nunaat (Greenland): distribution, temporal patterns and climatic controls

IF 2.8 3区地球科学 Q2 GEOGRAPHY, PHYSICAL

Journal of Glaciology Pub Date : 2023-08-31 DOI:10.1017/jog.2023.61

H. Lovell, J. Carrivick, O. King, J. Sutherland, J. Yde, C. M. Boston, Jakub Małecki

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引用次数: 0

Abstract

We present the first systematic inventory of surge-type glaciers for the whole of Greenland compiled from published datasets and multitemporal satellite images and digital elevation models. The inventory allows us to define the spatial and climatic distribution of surge-type glaciers and to analyse the timing of surges from 1985 to 2019. We identified 274 surge-type glaciers, an increase of 37% compared to previous work. Mapping surge-type glacier distribution by temperature and precipitation variables derived from ERA5-Land reanalysis data shows that the west and east clusters occur in well-defined climatic envelopes. Analysis of the timing of surge active phases during the periods ~1985 to 2000 (T1) and ~2000 to 2019 (T2) suggests that overall surge activity is similar in T1 and T2, but there appears to be a reduction in surging in the west cluster in T2. Our climate analysis shows a coincident increase in mean annual and mean winter air temperature between T1 and T2. We suggest that as glaciers thin under current warming, some surge-type glaciers in the west cluster may be being prevented from surging due to (1) their inability to build-up sufficient mass and (2) a switch from a polythermal to a largely cold-based thermal regime.

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Kalaallit Nunaat(格陵兰)的涌浪型冰川:分布、时间模式和气候控制

我们根据已发表的数据集、多时相卫星图像和数字高程模型编制了整个格陵兰岛涌浪型冰川的第一个系统清单。该清单使我们能够确定涌浪型冰川的空间和气候分布，并分析1985年至2019年涌浪的时间。我们确定了274个激流型冰川，比以前的工作增加了37%。利用ERA5-Land再分析数据得出的温度和降水变量绘制激流型冰川分布图，表明西部和东部冰川群出现在明确的气候包络中。对~1985 ~2000年(T1)和~2000 ~ 2019年(T2)期间浪涌活动期时间的分析表明，在T1和T2期间，总体浪涌活动相似，但在T2期间，西部集群的浪涌似乎有所减少。我们的气候分析显示，在T1和T2之间，年平均气温和冬季平均气温同时上升。我们认为，在当前变暖的情况下，随着冰川变薄，西部冰川群中的一些涌浪型冰川可能会因以下原因而无法涌浪:1)它们无法积累足够的质量;2)从多热状态转变为主要以冷为基础的热状态。

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

Journal of Glaciology 地学-地球科学综合

CiteScore

5.80

自引率

14.70%

发文量

101

审稿时长

6 months

期刊介绍： Journal of Glaciology publishes original scientific articles and letters in any aspect of glaciology- the study of ice. Studies of natural, artificial, and extraterrestrial ice and snow, as well as interactions between ice, snow and the atmospheric, oceanic and subglacial environment are all eligible. They may be based on field work, remote sensing, laboratory investigations, theoretical analysis or numerical modelling, or may report on newly developed glaciological instruments. Subjects covered recently in the Journal have included palaeoclimatology and the chemistry of the atmosphere as revealed in ice cores; theoretical and applied physics and chemistry of ice; the dynamics of glaciers and ice sheets, and changes in their extent and mass under climatic forcing; glacier energy balances at all scales; glacial landforms, and glaciers as geomorphic agents; snow science in all its aspects; ice as a host for surface and subglacial ecosystems; sea ice, icebergs and lake ice; and avalanche dynamics and other glacial hazards to human activity. Studies of permafrost and of ice in the Earth’s atmosphere are also within the domain of the Journal, as are interdisciplinary applications to engineering, biological, and social sciences, and studies in the history of glaciology.