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MM5和WRF对北京地区低层大气局地环流模拟能力的对比研究

, PP. 301-312

Keywords: WRF和MM5,北京地区,局地大气环流,模拟精度,比较研究

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Abstract:

?为了检验中尺度模式MM5和WRF在大气边界层局地环流研究中的适用性,本文应用MM5V3.7和WRFV2.2对北京地区低层大气中温度场和风场等边界层特征量进行了若干个例模拟,将模拟结果与该区域19个自动气象站的观测资料进行相关性检验和误差分析,比较两个中尺度模式对该地区大气边界层中存在的中尺度局地耦合环流结构的模拟能力.结果表明WRF与MM5对该地区由海陆风环流、山谷风环流和城市热岛环流共同作用形成的大气边界层局地耦合环流的位置、范围、结构特征和日变化特征的模拟均与实测结果较为吻合;WRF和MM5对近地面温度场的模拟精度均明显高于对近地面风场的模拟精度.MM5比WRF对于地表热力过程的描述更加细致精确,因而对该地区近地面温度场的模拟精度比WRF略高.WRF对近地面风场,尤其是对阵风背景下的近地面风场结构有比MM5更好的模拟能力.另外,模拟结果以及其统计分析均表明:WRF与MM5对近地面风场的模拟精确度均由城郊到市区逐渐降低,反映了两种模式对城市复杂下垫面精细结构条件下的陆面过程的描述均有待进一步改进.

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