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首页> 外文期刊>Surveys in Geophysics: An International Review Journal of Geophysics and Planetary Sciences >A Downscaling Approach Toward High-Resolution Surface Mass Balance Over Antarctica
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A Downscaling Approach Toward High-Resolution Surface Mass Balance Over Antarctica

机译:一种实现南极洲高分辨率表面质量平衡的缩减方法

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摘要

The Antarctic ice sheet surface mass balance shows high spatial variability over the coastal area. As state-of-the-art climate models usually require coarse resolutions to keep computational costs to a moderate level, they miss some local features that can be captured by field measurements. The downscaling approach adopted here consists of using a cascade of atmospheric models from large scale to meso-γ scale. A regional climate model (Modèle Atmosphérique Régional) forced by meteorological reanalyses provides a diagnostic physically-based rain- and snowfall downscaling model with meteorological fields at the regional scale. Although the parameterizations invoked by the downscaling model are fairly simple, the knowledge of small-scale topography significantly improves the representation of spatial variability of precipitation and therefore that of the surface mass balance. Model evaluation is carried out with the help of shallow firn cores and snow height measurements provided by automatic weather stations. Although downscaling of blowing snow still needs to be implemented in the model, the net accumulation gradient across Law Dome summit is shown to be induced mostly by orographic effects on precipitation.
机译:南极冰盖表面质量平衡在沿海地区表现出很高的空间变异性。由于最新的气候模型通常需要粗略的分辨率才能将计算成本保持在中等水平,因此它们错过了一些可以通过现场测量捕获的局部特征。这里采用的降尺度方法包括使用从大尺度到中观γ尺度的级联大气模型。通过气象重新分析,建立了一个区域气候模型(ModèleAtmosphériqueRégional),该模型提供了基于诊断的基于物理的雨量和降雪降尺度模型,并具有该区域规模的气象场。尽管按比例缩小模型调用的参数设置相当简单,但小规模地形的知识显着改善了降水的空间变异性表示,从而改善了表面质量平衡的表示。模型评估是在浅层岩心和自动气象站提供的雪高测量的帮助下进行的。尽管仍需要在模型中实现降雪的降尺度,但事实证明,整个劳恩穹顶的净积累梯度主要是由地形对降水的影响引起的。

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