Temporal downscaling of glaciological mass balance using seasonal observations

IF 2.8 3区 地球科学 Q2 GEOGRAPHY, PHYSICAL
Michael Zemp, Ethan Welty
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引用次数: 0

Abstract

Abstract Glaciological mass-balance measurements have been the backbone of internationally coordinated glacier monitoring. The resulting annual observations have been used to understand glacier reactions to climate change, and to assess both regional and global glacier mass changes and related contributions to runoff and sea-level rise. However, the comparability of annual observations is hampered by differences in survey periods and mass-balance amplitudes between glaciers, regions and hemispheres. This study presents a simple approach to temporally downscale glaciological mass balance using seasonal observations and sine functions. The proposed analytical model allows reconstruction of the seasonal course of glacier mass balance at weekly to monthly resolution from only annual or seasonal observations. Strengths and limitations of this analytical approach are discussed and compared with results from numerical mass-balance modelling. Potential applications include seasonal corrections of glaciological and geodetic observations and comparisons to monthly results from spaceborne gravimetry and altimetry.
利用季节观测的冰川物质平衡的时间降尺度
冰川质量平衡测量一直是国际协调冰川监测的支柱。由此产生的年度观测已用于了解冰川对气候变化的反应,并评估区域和全球冰川质量变化及其对径流和海平面上升的相关贡献。然而,年度观测的可比性受到冰川、区域和半球之间的调查周期和质量平衡振幅差异的影响。本研究提出了一种利用季节观测和正弦函数来研究时间尺度下冰川物质平衡的简单方法。所提出的分析模型允许仅从年度或季节观测资料,以周至月的分辨率重建冰川物质平衡的季节过程。讨论了这种分析方法的优点和局限性,并与数值质量平衡模拟的结果进行了比较。潜在的应用包括冰川学和大地测量观测的季节校正以及与星载重力和测高每月结果的比较。
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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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