ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Archive > Volume 51 Issue 3 > 2025,51(3):337-348. DOI:10.7519/j.issn.1000-0526.2025.011602 Prev Next
Characteristics of FY-4A Satellite Cloud Physical Parameters in Severe Convective Weather in Ningxia
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Abstract:
Based on the observation data of FY-4A Advanced Geosynchronous Radiation Imager (AGRI) and surface observation data during 2018-2020, the distribution characteristics of satellite products in different severe convective weathers, including short-time heavy precipitation, lightning and hail, are studied by using statistical methods such as normal distribution test and correlation analysis. The results are as follows. The difference of convection in severe convective weather leads to different distribution characteristics of FY-4A satellite products. During short-time heavy precipitation, the cloud top temperature (CTT) and black body temperature (TBB) are mainly concentrated in the range of 200-280 K, and different cloud shapes lead to significant differences in temperature ranges. However, during lightning and hail processes, the main ranges of CTT and TBB are located between 210-270 K. More than 50% of short-time heavy precipitation, 75% of lightning, and more than 90% of hail occur at altitudes above 5000 m (500 hPa). The radii of cloud droplets in different convective weathers are obviously different. Short-time heavy precipitation, lightning and hail correspond to small, middle and large cloud droplets, respectively. When the liquid water content (LWC) in clouds exceeds 500 g·m-2, short-time heavy precipitation is prone to occur. For lightning, the LWC ranges from 250 to 400 g·m-2, and for hail, it ranges from 400 to 600 g·m-2. Moderate intensity tropopause folding depth (TZD) is conducive to the occurrence and maintenance of heavy precipitation and lightning, while hail requires deeper folding depth. Except that the CTT and the cloud top height (CTH) in the lightning hail series show normal distribution or quasi-normal distribution characteristics, other FY-4A products do not conform to normal distribution. FY-4A products are significantly correlated to short-time heavy precipitation in CTT, TBB, LWC and TZD, lightning in CTT, TBB and TZD, as well as hail in CTT, CTH, TBB, LWC and TZD. These products need to be paid more attention to in monitoring and early warning operations.
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P426
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