Role of large scale moist dynamics in November 1-5, 1994, hazardous Mediterranean weather
Role of large scale moist dynamics in November 1-5, 1994, hazardous Mediterranean weather
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1994 年 11 月 1 日至 5 日地中海危险天气期间大规模潮湿动力的作用
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
P. Alpert
中科院分区：
文献类型：
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作者：
S. Krichak;P. Alpert
研究了1994年11月1日至5日地中海地区异常强风暴期间潮湿动力学在大气过程中的作用。分析的重点是东地中海地区采用96小时的模式预测在地中海地区与佛罗里达州立大学（FSU）的全球光谱模型。敏感性模拟的不同之处仅在于规定了位于阿拉伯海、红海以及低纬度和高纬度大面积地区的选定区域的初始湿度场。对流层轨迹和模型试验都表明，地中海东部的暴雨与阿拉伯海区域的气团异常密集的扩散有关，这种扩散发生在该期间的前24小时和头24小时。1994年11月5日，来自阿拉伯海的气团也参与了意大利和法国南部的密集发展。根据模式模拟，赤道非洲上空的对流过程在发展中起着重要作用。此外，由于赤道非洲上空的对流，对流层上部西风的加强刺激了红海槽的向北延伸，从而减少了热带对流的水汽流入，因此似乎是一种负反馈。
Investigation of the role of moist dynamics in the atmospheric processes during the abnormally intensive stormy period of November 1–5, 1994, over the Mediterranean region is presented. Analysis focuses on the eastern Mediterranean area employing 96-hour model predictions over the Mediterranean region with the Florida State University (FSU) global spectral model. Sensitivity simulations differ only by prescribing the initial moisture fields in the selected regions located in the Arabian Sea, Red Sea, and over large areas in the low and high latitudes. Both the tropospheric trajectories and the model tests suggest that the heavy rains over the eastern Mediterranean were associated with unusually intensive propagation of air masses from the Arabian Sea region, which took place before and during the first 24 hours of the period. Air masses from the Arabian Sea participated also in the intensive developments in Italy and southern France on November 5, 1994. According to the model simulations the convective processes over the equatorial Africa play a major role in the developments. Also, the intensification of the upper tropospheric westerly winds due to the convection over the equatorial Africa stimulates the northward extension of the Red Sea trough which consequently diminishes the moisture influx for the tropical convection and therefore seems to serve as a negative feedback.