Infrared brightness temperature-based indicators for identifying thunderstorm clouds:Insights from FY-4A satellite observationsOA
Accurate monitoring and timely identification of early indicators of thunderstorms are of paramount importance in preventing and mitigating the potential disasters associated with such meteorological events.This study utilizes the TOBAC(Tracking and Object-Based Analysis of Clouds)automated tracking algorithm,integrated with FY-4A geostationary satellite infrared data,to investigate the spatiotemporal characteristics and evolutionary patterns of cloud-top brightness temperature(BT),areal extent,and phase transitions of thunderstorm and non-thunderstorm clouds across the North China region.The analysis reveals that thunderstorm clouds demonstrate significantly enhanced convective intensity compared to non-thunderstorm clouds,with the following distinctive features:(1)a substantially faster drop rate in 10.8µm BT,reaching values nearly 2.3 times greater;(2)positive BT differences between the 10.8 and 8.5µm channels,exceeding 0 K;and(3)a dramatically increased areal expansion rate,approximately 4.5-fold higher than that observed in non-thunderstorm clouds.These findings provide significant scientific insights and practical implications for advancing thunderstorm identification techniques and optimizing early warning systems,which are critical to improving disaster prevention and mitigation capacity across the North China region.
Chaoying Wang;Rubin Jiang;Jiangjiang Xia;Yunfei Wu;Hongrong Shi;Fengquan Li;Xiang''ao Xia
Key Laboratory of Middle Atmosphere and Global Environment Observation(LAGEO),Institute of Atmospheric Physics,CAS,Beijing,China University of Chinese Academy of Sciences,Beijing,ChinaKey Laboratory of Middle Atmosphere and Global Environment Observation(LAGEO),Institute of Atmospheric Physics,CAS,Beijing,China State Key Laboratory of Atmospheric Environment and Extreme Meteorology,Institute of Atmospheric Physics,CAS,Beijing,ChinaKey Laboratory of Regional Climate and Environment for Temperate East Asia(RCE-TEA),Institute of Atmospheric Physics,CAS,Beijing,ChinaState Key Laboratory of Atmospheric Environment and Extreme Meteorology,Institute of Atmospheric Physics,CAS,Beijing,ChinaState Key Laboratory of Atmospheric Environment and Extreme Meteorology,Institute of Atmospheric Physics,CAS,Beijing,ChinaChina Electric Power Research Institute,Wuhan,ChinaKey Laboratory of Middle Atmosphere and Global Environment Observation(LAGEO),Institute of Atmospheric Physics,CAS,Beijing,China University of Chinese Academy of Sciences,Beijing,China
天文与地球科学
ThunderstormTOBACFY-4ALightningNorth China
《Atmospheric and Oceanic Science Letters》 2026 (3)
P.15-20,6
supported by the Strategic Priority Research Program of the Chinese Academy of Sciences[grant number XDB0760402]the National Natural Science Foundation of China[grant number42322505]。
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