ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Characteristics of FY-4A Satellite Cloud Physical Parameters in Severe Convective Weathers in Ningxia
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Abstract:
Based on the observation data of FY-4A Advanced Geosynchronous Radiation Imager(AGRI) and ground observation data during 2018—2020, the distribution characteristics of satellite products in different severe convective weather,which contained short-term heavy precipitation,lightning and hail,were studied by using statistical methods such as normal distribution test and correlation analysis. The results show that: (1) The difference of convection in severe convective weather leads to the different distribution characteristics of FY-4A satellite products. During short-term heavy precipitation, the cloud top temperature and black body temperature are mainly concentrated between 235~275K, and different cloud shapes lead to significant differences in temperature ranges, while during lightning and hail, the main range is located between 225~250K, which are lower than short-term heavy precipitation. More than 50% of short-term heavy precipitation, 75% of lightning, and more than 90% of hail occurred at altitudes above 5000m (500hPa); The radii of cloud droplets in different convective weather are obviously different. Short-term heavy precipitation, lightning and hail correspond to relatively large cloud droplets, small cloud droplets and large cloud droplets respectively; When the liquid water content in clouds exceeds 500 g?m-2, short-term heavy precipitation is prone to occur, while lightning ranges from 300 to 350 g?m-2 but hail ranges from 400 to 600 g?m-2; The deepest folding depth of the moderate intensity troposphere is conducive to the occurrence and maintenance of heavy precipitation and lightning, while hail requires deeper folding depth. (2) Except that the cloud top temperature and the cloud top height in the lightning hail series show normal distribution or quasi-normal distribution characteristics, other products do not conform to normal distribution. (3) There are three, three and five categories of FY-4A products significantly related to short-time heavy precipitation(CTT,TBB and TZD), lightning(CTT,TBB and TZD) and hail(CTT,CTH,TBB,LWP and TZD), respectively, which can be paid more attention to in monitoring and early warning.
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