Impact of the MAP Reanalysis on the Numerical Simulation of the MAP IOP2a Convective System
Impact of the MAP Reanalysis on the Numerical Simulation of the MAP IOP2a Convective System
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MAP 再分析对 MAP IOP2a 对流系统数值模拟的影响
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
O. Bock
中科院分区：
文献类型：
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作者：
F. Lascaux;E. Richard;C. Keil;O. Bock
使用 Meso-NH 中尺度模型对 MAP IOP2a 期间观测到的对流系统进行了数值模拟，使用水平网格尺寸为 32、8 和 2 km 的三重嵌套技术。根据 1999 年 9 月 17 日 12 UTC 的 ECMWF 运行分析启动的参考实验相当成功地启动了阿尔卑斯山麓上空的对流线，并再现了其向东方的传播。研究了这些结果对再分析产品的敏感性。在 ECMWF MAP 再分析中，发现意大利北部上空的低层大气比运行分析中的干燥得多。因此，在基于重新分析的介尺度模拟中，对流几乎完全被抑制。不同的灵敏度实验进一步强调了介观结果对初始湿度场的强烈依赖性。
Numerical simulations of the convective system observed during the MAP IOP2a have been performed with the Meso-NH mesoscale model, using a threefold nesting technique with horizontal mesh-sizes of 32, 8 and 2 km. The reference experiment initialized from the operational ECMWF analysis of 17 September 1999 12 UTC succeeds reasonably well in initiating the convective line over the Alpine foothills and reproducing its propagation towards the East. The sensitivity of these results to the reanalysis products is investigated. In the ECMWF MAP reanalysis, the lower atmosphere above Northern Italy is found considerably drier than in the operational analysis. As a consequence, convection is almost entirely inhibited in the mesoscale simulations based upon the reanalysis. Different sensitivity experiments further highlight the strong dependence of the mesoscale results upon the initial moisture fields.