Mesoscale Convective System Rainfall in the Sahel
Mesoscale Convective System Rainfall in the Sahel
复制标题
萨赫勒地区的中尺度对流系统降雨
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
T. Lebel
中科院分区：
文献类型：
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作者：
Vincent Mathon;H. Laurent;T. Lebel
摘要：基于全分辨率气象卫星数据集，对萨赫勒地区卫星观测到的中尺度对流系统 (MCS) 进行了广泛的气候学研究，定义了 MCS 的一个亚群——称为有组织的对流系统 (OCS)，该亚群仅占萨赫勒中部地区 9 年来观测到的 MCS 总数的 12%，但几乎占 2017 年定义的对流云总量的 80%。 233-K 阈值。利用高分辨率降雨数据集显示，这些OCS也是该地区的主要降雨源，约占季节性降雨量的90%，每个系统的平均面积降雨量为14.7毫米。所有的OCS都与降雨事件相关，并且90%以上的主要降雨事件都与OCS相关。这些数字与中尺度对流复合体（MCC）获得的数字进行了比较。每个 MCC 平均产生更多降雨（每个系统 19 毫米），但它们的数量很少（占 MCS 总数的 1.2%），...
Abstract Based on a full-resolution Meteosat dataset, an extensive climatological study of the mesoscale convective systems (MCSs) observed by satellite over the Sahel leads to the definition of a subpopulation of MCSs—called organized convective systems (OCSs)—that represents only 12% of the total number of MCSs observed during 9 yr over the central Sahel while accounting for almost 80% of the total convective cloud cover defined at the 233-K threshold. Using a high-resolution rainfall dataset, it is shown that these OCSs are also the main source of rain in this region, accounting for about 90% of the seasonal rainfall, with a mean areal rainfall of 14.7 mm per system. All of the OCSs are associated with a rain event, and more than 90% of the major rain events are associated with an OCS. These figures are compared with those obtained for mesoscale convective complexes (MCCs). Each MCC produces more rainfall on average (19 mm per system) but there are only a few of them (1.2% of the total number of MCSs),...