Observational Studies of Mesoscale Cellular Convection.
Observational Studies of Mesoscale Cellular Convection.
复制标题
中尺度细胞对流的观测研究。
DOI：
--
复制
发表时间：
1974
期刊：
影响因子：
--
通讯作者：
K. E. Dowell
中科院分区：
文献类型：
--
作者：
E. Agee;K. E. Dowell
本文对1969年1月1日至1970年6月30日期间发生在北大西洋和北太平洋广大地区的中尺度细胞对流进行了观测研究。分析了ESSA-7、ESSA-9和ATS-3卫星云图和常规雷达探测资料共38个个例，其中包括25个开放对流型和13个闭合对流型。计算表明：1)开放单体的平均直径为30公里，封闭单体的平均直径为32公里；2)开放单体的平均对流深度为2.3公里，大于封闭单体的平均对流深度1.3公里；3)开放单体的平均长宽比(直径与深度之比)为15：1，小于闭合单体的28：1；4)长宽比与对流深度的增加成反比；5)开放单体的海面温度平均比气温高2.1℃，而闭合单体的平均海温低0.4℃；6)水平风的方向切变和大小切变(垂直方向)较小。
Abstract An observational study of mesoscale cellular convection occurring over vast regions of the North Atlantic and North Pacific has been done for the period 1 January 1969 through 30 June 1970. Satellite cloud photography from the ESSA 7, ESSA 9 and ATS 3 satellites and conventional rawinsonde data have been analyzed for a total of 38 cases, consisting of 25 open and 13 closed convective patterns. Computations have shown that: 1) the average diameter for open cells is 30 km and for closed cells 32 km; 2) the average convective depth for open cells is 2.3 km, greater than the 1.3 km average for closed cells; 3) the average aspect (diameter-to-depth) ratio for open cells, 15:1, is less than that for closed cells, 28:1; 4) the aspect ratio is inversely proportional to increasing convective depth; 5) sea surface temperature exceeds the air temperature on the average by 2.1C in open cells but is 0.4C less in closed cells; 6) directional and magnitude shear (in the vertical) of the horizontal wind is small...