Validation of a limited area model over Dome C, Antarctic Plateau, during winter
Validation of a limited area model over Dome C, Antarctic Plateau, during winter
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南极高原 Dome C 冬季有限区域模型的验证
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
I. Gorodetskaya
中科院分区：
文献类型：
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作者：
H. Gallee;I. Gorodetskaya
有限区域模式MAR（Modèle Atmosphere érique Régional）在2004-2006年期间在南极高原上进行了验证，重点是寒冷季节的Dome C。MAR模拟是通过初始化模型一次，并通过ECMWF业务分析迫使它通过其横向和顶部边界。模型输出与自动气象站、辐射计和大气探测的观测结果相比，效果良好。MAR能够模拟冬季在Dome C发生的冷暖事件的连续性。较大的长波下降流通量（LWD）是负责较高的地面气温和较弱的地面逆温在冬季。当在辐射传输计算中考虑到小的南极降水雪粒子时，暖事件被更好地模拟。MAR平流层在寒冷季节冷却，最冷的温度与地表的温暖事件同时发生。与这些最冷温度相关的饱和比湿的降低是极地平流层云（PSC）形成的原因，特别是在8 - 9月。PSC则通过增加地表下沉长波通量而对地表变暖做出贡献。
The limited area model MAR (Modèle Atmosphérique Régional) is validated over the Antarctic Plateau for the period 2004–2006, focussing on Dome C during the cold season. MAR simulations are made by initializing the model once and by forcing it through its lateral and top boundaries by the ECMWF operational analyses. Model outputs compare favourably with observations from automatic weather station (AWS), radiometers and atmospheric soundings. MAR is able to simulate the succession of cold and warm events which occur at Dome C during winter. Larger longwave downwelling fluxes (LWD) are responsible for higher surface air temperatures and weaker surface inversions during winter. Warm events are better simulated when the small Antarctic precipitating snow particles are taken into account in radiative transfer computations. MAR stratosphere cools during the cold season, with the coldest temperatures occurring in conjunction with warm events at the surface. The decrease of saturation specific humidity associated with these coldest temperatures is responsible for the formation of polar stratospheric clouds (PSCs) especially in August-September. PSCs then contribute to the surface warming by increasing the surface downwelling longwave flux.