Snowdrift modelling for the Vestfonna ice cap, north-eastern Svalbard
Snowdrift modelling for the Vestfonna ice cap, north-eastern Svalbard
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DOI：
10.5194/tc-7-1287-2013
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发表时间：
2013-08
期刊：
影响因子：
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通讯作者：
T. Sauter;M. Möller;R. Finkelnburg;M. Grabiec;D. Scherer;C. Schneider
中科院分区：
文献类型：
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作者：
T. Sauter;M. Möller;R. Finkelnburg;M. Grabiec;D. Scherer;C. Schneider
摘要。漂移和吹雪对积雪的再分布经常导致较大冰盖上的积雪质量分布不均匀。这些过程与积雪升华对低层大气边界层的热力学影响一起影响冰川表面物质平衡。本研究首次采用专门设计的snow2blow雪漂模型对Vestfonna冰盖（Svalbard）吹雪和漂雪的雪漂和升华进行了量化。该模式受来自极地天气研究与预报模式的大气场的强迫，并在250 m的空间分辨率上解析过程。该模型应用于2008/2009年Vestfonna冰帽积累期。与无线电回波探测和雪坑测量结果的比较表明，该模式能够分辨出重要的局地尺度过程，再现了整体的积雪格局。研究结果表明，雪团从冰盖内部向周边地区和冰坡有明显的再分布。悬浮雪的飘雪升华在春季更为强烈。结果表明，再分配过程的强度足以对冰川物质平衡产生重大影响。
Abstract. The redistribution of snow by drifting and blowing snow frequently leads to an inhomogeneous snow mass distribution on larger ice caps. Together with the thermodynamic impact of drifting snow sublimation on the lower atmospheric boundary layer, these processes affect the glacier surface mass balance. This study provides a first quantification of snowdrift and sublimation of blowing and drifting snow on the Vestfonna ice cap (Svalbard) by using the specifically designed snow2blow snowdrift model. The model is forced by atmospheric fields from the Polar Weather Research and Forecasting model and resolves processes on a spatial resolution of 250 m. The model is applied to the Vestfonna ice cap for the accumulation period 2008/2009. Comparison with radio-echo soundings and snow-pit measurements show that important local-scale processes are resolved by the model and the overall snow accumulation pattern is reproduced. The findings indicate that there is a significant redistribution of snow mass from the interior of the ice cap to the surrounding areas and ice slopes. Drifting snow sublimation of suspended snow is found to be stronger during spring. It is concluded that the redistribution process is strong enough to have a significant impact on glacier mass balance.