Squall lines and rainfall over Western Africa during summer 1986 and 87
Squall lines and rainfall over Western Africa during summer 1986 and 87
复制标题
1986 年和 87 年夏季西非的飑线和降雨
DOI：
--
复制
发表时间：
2005
期刊：
影响因子：
--
通讯作者：
P. De Felice
中科院分区：
文献类型：
--
作者：
A. Gaye;A. Viltard;P. De Felice
利用欧洲气象卫星的数字化红外图像，在1986年7月、8月和9月在西非观测到153条飑线（SLs）。利用800多个雨量站的日降雨量计算了南亚平均降雨量：1986年为15 km3, 1987年为22.5 km3。在一个给定站点，每次降雨的平均降雨量为15毫米，然而，由于位于一个SL下的站点中只有大约一半经历了一次降雨，沿着整个SL带的平均降雨量为6.8毫米。借助气象卫星的8个每日槽位，可以估计出SL的面积日变化：即中午左右最小，午夜左右最大。利用SLs位移（东西向），人们可以获得降雨量的日变化，正如几位使用气象卫星图像的作者已经发现的那样，早晨最小，下午快结束时最大。
SummaryUsing digitized IR images from the European satellite Meteosat, 153 squall lines (SLs) were observed over Western Africa during July, August and September 1986 and 87. The SL mean rainfall volume was computed using the daily rainfall amounts of more than 800 raingauges: 15 km3 in 1986 and 22.5 km3 in 1987. A mean amount of 15 mm was collected per rainy episode at a given station, however, as only about half of the stations situated under a SL experienced a rainy episode, the rainfall amount averaged along the total SL’s swath was 6.8 mm.With the help of the 8 daily Meteosat slots the SL’s area daily variation could be estimated: namely a minimum around noon and a maximum around midnight. Using the SLs displacements (east–west) one had access to the daily variation of the rainfall volume, a minimum in the morning and a maximum toward the end of the afternoon, as already found by several authors who used Meteosat images.