A CLIMATOLOGY OF DEEP CONVECTION OVER SOUTH CHINA AND THE ADJACENT WATERS DURING SUMMER
A CLIMATOLOGY OF DEEP CONVECTION OVER SOUTH CHINA AND THE ADJACENT WATERS DURING SUMMER
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发表时间：
2013
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通讯作者：
郑永光;陈炯
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作者：
郑永光;陈炯
由于长期卫星红外亮温资料具有较高的时空分辨率和较好的完整性，利用1996-2007年6 - 8月的逐时红外TBB资料，分析了华南及其邻近沃茨夏季深对流的气候特征结果表明，华南及邻近沃茨TBB ≤-52℃深对流的地理分布与以往地面雷暴观测和低层对流的统计结果基本一致。轨道卫星闪电观测。每月，10天，本文着重研究了该地区深对流的五日变化和日变化，发现6 - 8月有5个深对流活跃区，深对流的月变化与强对流活动有密切关系，而强对流活动的月变化与强对流活动的日变化有密切关系。6月华南陆地深对流较活跃，7、8月南海深对流较活跃，深对流发展具有明显的间歇性，周期约为3 ~ 5五天的时间。然而，华南沿海地区的深对流在夏季仍然比较活跃，没有明显的季节性变化。深对流的日变化表明，华南及其邻近沃茨不同地区的深对流有不同的变化，华南陆地和华南海域的深对流变化趋势呈负相关深对流的日变化表明，由海陆温差引起的海陆风和由山区与平原或盆地温差引起的山谷风，使深对流在下午由海向陆传播，午夜后由陆向海传播，午夜后山区对流由山区向平原传播。深对流的日变化主要表现为：由海陆温差引起的海陆风和由山区与平原或盆地温差引起的山谷风，使深对流在下午由海向陆传播，午夜后由陆向海传播，午夜后山区对流由山区向平原传播。
Due to the higher temporal and spatial resolution and the better integrality of long-term satellite infrared(IR) Brightness Temperature(TBB) data,a climatology of deep convection during summer over South China and the adjacent waters is presented in this paper based on the 1-hourly infrared IR TBB data during June-August of 1996-2007(except 2004).The results show that the geographic distribution of deep convection denoted by TBB ≤-52℃ over South China and the adjacent waters are basically consistent with previous statistical results based on surface thunderstorm observations and low-orbit satellite lightning observations.The monthly,ten-day,five-day and diurnal variations of deep convection in this region are focused on in this paper.There are 5 active deep-convection areas in June-August.The monthly variations of the deep convection are closely associated with the large-scale atmospheric circulations.The deep convection over the land areas of South China is more active in June while that over the South China Sea is more active in July and August.The development of deep convection is prominently intermittent and its period is about 3 to 5 five-day periods.However,the deep convection over the coastal areas in South China remains more active during summer and has no apparent intermittence.The ten-day and five-day variations of deep convection show that there are different variations of deep convection over different areas in South China and the adjacent waters.The tendency of deep convection over the land areas of South China is negatively correlated with that over the South China Sea.The diurnal variations of deep convection show that the sea-land breeze,caused by the thermal differences between land and sea,and the mountain-valley breeze,caused by the thermal differences between mountains and plains or basins,cause deep convection to propagate from sea to land in the afternoon and from land to sea after midnight,and the convection over mountains propagates from mountains to plains after midnight.The differen