Mass-balance and ablation processes of a perennial polar ice patch on the northern coast of Ellesmere Island

IF 2.8 3区 地球科学 Q2 GEOGRAPHY, PHYSICAL
Gautier Davesne, David H. Fortier, F. Dominé, C. Kinnard
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引用次数: 0

Abstract

Ice patches have implications for landscape and ecosystem dynamics in polar deserts, however, the understanding of the driving factors that control their spatio-temporal variability is limited. This study aims to assess the seasonal and long-term evolution of ice patches on Ward Hunt Island (WHI; 83°N, Canadian High Arctic) based on field measurements of surface mass and energy balance. Results show that mass gains of the ice patch systems occur mostly through drifting snow, making them highly linked to the topography as well as the frequency and magnitude of wind events. Summer ablation is primarily driven by net radiation, but the short-term variability in melt rate is driven by sensible heat fluxes. The highest ablation rates occur during the passage of warm fronts that combine strong winds and mild temperatures. Conversely, foggy days reduce fluxes of solar radiation and sensible heat to the snow/ice surface, thereby suppressing ablation. Ice patches are less climate-sensitive than other cryospheric elements due to a feedback between snow accumulation and topography, however, summer ablation is strongly influenced by micrometeorology. Model projections of these factors suggest that conditions will become critical for preserving ice patches at WHI and along the northern coast of Ellesmere Island as early as in the next decades.
埃尔斯米尔岛北海岸一个常年极地冰盖的质量平衡和消融过程
冰斑对极地沙漠景观和生态系统动态具有重要影响,但对控制其时空变化的驱动因素的认识有限。本研究旨在评估沃德亨特岛冰原的季节性和长期演变。83°N,加拿大高纬度北极),基于地面质量和能量平衡的实地测量。结果表明,冰原系统的质量增加主要是通过飘雪发生的,这使得它们与地形以及风事件的频率和强度密切相关。夏季消融主要是由净辐射驱动的,但融化速率的短期变率是由感热通量驱动的。在结合了强风和温和温度的暖锋经过时,发生了最高的消融率。相反,雾天减少太阳辐射通量和感热到雪/冰表面,从而抑制消融。由于积雪和地形之间的反馈作用,冰块对气候的敏感性低于其他冰冻圈要素,然而,夏季消融受微气象学的强烈影响。对这些因素的模型预测表明,最早在未来几十年,保护WHI和埃尔斯米尔岛北部海岸的冰原的条件将变得至关重要。
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来源期刊
Journal of Glaciology
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.
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