| 摘要: |
| 【目的】为检验卫星产品在四川东北部对流云团监测中的效果。
【方法】利用FY-4A卫星资料，对2023年7月2日和9月18日四川东北部2次暴雨过程进行分析。
【结果】（1）FY-4A的云顶温度(CTT)可以有效地反映对流各阶段特征，对流越强，CTT越低。（2）强降水均发生在相当黑体温度(TBB)迅速下降阶段，TBB小时内降幅超过30 K，且TBB低于230 K，对极端降水有较好的指示意义。（3）相当黑体温度梯度(GTBB)可以表征对流发展情况，GTBB亮带所包围的区域越大，对流发展越成熟，强降水一般出现在对流云入流侧的GTBB大值区附近。（4）定量降水估测(QPE)产品对强降水有一定的指示意义，但估测降水强度偏低，对突发性对流或新生对流单体降水估测效果较差。
【结论】研究成果可为四川东北部对流云团监测预警提供分析依据。 |
| 关键词: FY-4A卫星；对流云；相当黑体温度；定量降水估测 |
| DOI： |
| 投稿时间：2024-05-16修订日期：2024-08-22 |
| 基金项目: |
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| Application of FY-4A Satellite in Monitoring Convective Cloud Clusters of Rainstorms in Northeastern Sichuan |
| JIAN Dongmei,XIA Li,ZHU Ruili,XIAO Peng |
| (Dazhou Meteorological Bureau,Dazhou,635000) |
| Abstract: |
| To reveal the effect of satellite products in monitoring convective clouds in northeastern Sichuan, this paper uses FY-4A satellite data to analyze the two rainstorm processes which occurred in northeastern Sichuan on July 2 and September 18, 2023, respectively. The results show that: (1) CTT of FY-4A satellite images can effectively reflect the characteristics of convection at each stage. The stronger the convection, the lower the CTT. (2) Heavy precipitation occurs in the rapid decline stage of TBB, and TBB is lower than 230 K while decreasing more than 30 K in an hour, which has a good indicative significance for extreme precipitation. (3) The GTBB can characterize the development situation of convection, in which the larger the areas surrounded by the GTBB bright band are, the more maturely the convection develops. Heavy precipitation generally appears near the large‐value zone of GTBB on the inflow side of the convective cloud. (4) QPE products have certain indicative significance for heavy precipitation, but have poor predictive performance on precipitation intensity, sudden convection, and nascent convective precipitation. The research results can provide an analytical basis for monitoring and early warning of convective cloud clusters in northeastern Sichuan. |
| Key words: FY-4A satellite；convective clouds；TBB；QPE |
