Evolution Characteristics of Convective Clouds With Relatively Small Scales Over South China

对流 自由对流层 环境科学 地球静止轨道 对流有效势能 大气科学 气候学 地球静止运行环境卫星 气象学 云顶 对流抑制 卫星 地理 地质学 物理 自然对流 天文 自然对流和联合对流
作者
Yikun Yang,Chuanfeng Zhao,Yang Wang,Yue Sun,Hao Fan,Xin Zhao,Yue Zhou
出处
期刊:Journal Of Geophysical Research: Atmospheres [Wiley]
卷期号:129 (15) 被引量:1
标识
DOI:10.1029/2024jd040780
摘要

Abstract As a crucial element in the Earth's system, development of convective clouds is still insufficiently understood and simulated in both weather and climate models, particularly for small‐scale regional convective clouds. In this study, a series of convective clouds cases with relatively small scales are selected over south China, and the evolution characteristics of those convective clouds are investigated using high spatiotemporal resolution geostationary satellite data. Statistical results show that the shorter the life cycle or the smaller the area, the higher the proportion of convective clouds. Notably, approximately 79.23% of convective clouds have a life cycle of less than 3 hr, and 63.81% have an area of less than 500 km 2 for selected cases. In addition, there are significant differences in the cloud characteristics and meteorological parameters during various convective cloud stages and durations. Nevertheless, the relative proportions of convective clouds at three identified stages remain relatively constant with almost no dependence on duration of convective clouds, which are 33.50%, 23.92%, and 42.58% for the developing, mature, and dissipation stages, respectively. In addition, we find that the cloud‐top cooling rate during the developing stage also affects the characteristics of the later stage of convective clouds. Quantitatively, the average cloud area and duration changed by 157.03 km 2 and 0.17 hr when the cloud‐top cooling rate varies by 15 K/h.
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