Regional modelling of the western Pacific typhoon season 2004
Regional modelling of the western Pacific typhoon season 2004
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DOI：
10.1127/0941-2948/2008/0282
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发表时间：
2008-08
影响因子：
1.2
通讯作者：
F. Feser;H. Storch
中科院分区：
文献类型：
--
作者：
F. Feser;H. Storch
研究了台风事件的集合，以发现区域大气模式在从全球再分析数据中动态降尺度这些极端天气现象方面的系统技能和不足。本文计算了2004年东南亚和北太平洋西部台风季的区域大气模式后播。全球再分析数据动态缩小到约50 km的网格分辨率，并以双嵌套方式缩小到18 km。模拟的台风路径和强度与最佳路径数据进行了比较。对比显示，与再分析相比，RCM在大多数情况下改善了SLP和近地面风值。再分析表明，与区域模型相比，最佳轨道数据的大圆距离更小。与50公里运行相比，RCM使用更高的分辨率更真实地模拟了降水模式和降雨量。结论是，区域模式可以通过提供更低的核心压力和更高的风速以及更真实的降水模式来改善全球强迫再分析数据模拟的台风发展，尽管这些值仍然没有达到观测值。
An ensemble of typhoon events was examined to detect systematic skills and deficiencies of regional atmospheric models in dynamical downscaling these extreme weather phenomena from global reanalyses data. A regional atmospheric model hindcast was computed for the typhoon season 2004 for SE Asia and the western North Pacific. Global reanalyses data were dynamically downscaled to a grid resolution of about 50 km and in a double-nesting approach to 18 km. Simulated typhoon tracks and intensities were compared to best track data. The comparison revealed improved SLP and near-surface wind values by the RCM compared to the reanalyses for most cases. The reanalyses showed smaller great circle distances to the best track data than the regional model. Precipitation patterns and rainfall amounts were simulated more realistically by the RCM using the higher resolution compared to the 50 km run. It is concluded that regional models can improve simulated typhoon developments from global forcing reanalyses data by giving lower core pressure and higher wind speeds and more realistic precipitation patterns even though these values still do not reach observed values.