Impact of model resolution on simulated wind, drifting snow and surface mass balance in Terre Adélie, East Antarctica
Impact of model resolution on simulated wind, drifting snow and surface mass balance in Terre Adélie, East Antarctica
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模型分辨率对南极洲东部阿德利岛模拟风、流雪和地表质量平衡的影响
DOI：
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发表时间：
2012
影响因子：
3.4
通讯作者：
Cécile Agosta
中科院分区：
文献类型：
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作者：
J. Lenaerts;M. R. van den Broeke;C. Scarchilli;Cécile Agosta
摘要 本文介绍了模式分辨率对南极洲东部阿德利岛及其周边地区模拟风速、流雪气候和表面质量平衡（SMB）的影响。我们比较了 2009 年分辨率为 27 公里和 5.5 公里的区域气候模型模拟。Terre Adélie 的风速最大值和维多利亚州狭窄的冰川山谷在 5.5 公里分辨率下可以更好地表示，因为地形分辨率更好。在高风速地区，流雪升华>100 mm a-1。我们的结果表明地形、风梯度和流雪侵蚀之间存在强烈的反馈。因此，SMB 在 5.5 km 分辨率下显示出更多的局部空间变化，该变化由流雪侵蚀控制，而大尺度 SMB 梯度主要由降水决定。流雪过程导致维多利亚州狭窄的冰川山谷消融。集成的 SMB 等于 86 Gt。尽管风气候、流雪过程和 SMB 变化在 5.5 km 处得到更好的体现，但面积积分 SMB 在 27 公里和 5.5 km 处的模拟之间没有显着差异。 27 公里的水平分辨率足以真实模拟冰盖宽的 SMB。
Abstract This paper presents the impact of model resolution on the simulated wind speed, drifting snow climate and surface mass balance (SMB) of Terre Adélie and its surroundings, East Antarctica. We compare regional climate model simulations at 27 and 5.5 km resolution for the year 2009. The wind speed maxima in Terre Adélie and the narrow glacial valleys of Victoria Land are better represented at 5.5 km resolution, because the topography is better resolved. Drifting snow sublimation is >100 mm a-1 in regions with high wind speeds. Our results indicate a strong feedback between topography, wind gradients and drifting snow erosion. As a result, SMB shows much more local spatial variability at 5.5 km resolution that is controlled by drifting snow erosion, whereas the large-scale SMB gradient is largely determined by precipitation. Drifting snow processes lead to ablation in the narrow glacial valleys of Victoria Land. The integrated SMB equals 86 Gt. Although wind climate, drifting snow processes and SMB variability are better represented at 5.5 km, the area-integrated SMB is not significantly different between the simulations at 27 and 5.5 km. A horizontal resolution of 27 km is sufficient to realistically simulate ice-sheet wide SMB.