FY-4A白天对流风暴和闪电产品在华北强雷暴天气分析中的应用

Application of FY-4A daytime convective storm and lightning products in analyzing severe thunderstorm weather in North China

我国第二代静止气象卫星FY-4A观测能力较之前有明显提升,在天气特别是对流性天气监测和预测中具有较强的应用潜力。利用FY-4A气象卫星多通道扫描辐射成像仪(Advanced Geosynchronous Radiation Imager,AGRI)和闪电成像仪(Lightning Mapping Imager,LMI)数据开展研究,分析了反演产品在强雷暴天气中的应用。研究表明,扫描辐射成像仪多通道组合白天对流风暴红-绿-蓝(red-green-blue,RGB)合成产品可以突出具有强上升气流的对流性雷暴云,较单通道及多通道可见光合成产品具有监测优势;闪电成像仪产品较地面闪电探测闪电产品能够探测到更多的闪电,对新生对流和较弱对流产生的闪电监测具有优势;在华北和黄淮一次强雷暴天气过程中,白天对流风暴RGB合成产品能够监测云系发展的过程,卫星监测闪电活动频数和冰雹活动一致性较好。

The observation capability of the second generation geostationary meteorological satellite FY-4A in China has significantly improved,and it has high application potential in weather monitoring and prediction,especially in convective weather systems.FY-4A Advanced Geosynchronous Radiation Imager(AGRI)and Lightning Mapping Imager(LMI)data are used and the application of retrieval products in severe thunderstorm weather is analyzed.The results show that,due to the high spectral resolution of AGRI,the convective thunderstorms with strong updraft can be highlighted by the combination of multi-channel daytime convective storm RGB(red-green-blue)products,which have advantages over single-channel and multi-channel visible synthetic products;LMI products can detect more lightning than that from ground-based lightning products,which have advantages in monitoring lightning generated by newborn or weak convections;during a severe thunderstorm process in North China and Huanghuai region,the daytime convective storm RGB products can monitor the development of cloud system,and the frequency of lightning activities monitored by the satellite is in good agreement with hail activity.