关键词: 静止气象卫星, IR4通道, 反照率, 降水, 天气雷达

Abstract: Based on the derivation of the formula of channel IR4 albedo, the data including the brightness temperature and the albedo of channel IR4 was applied to analyze a case of the precipitation in summer in Beijing. The results show that channel IR4 albedo will increase and then decrease significantly before the precipitation is generated. Channel IR4 has an earlier feedback on the precipitation than long-wave infrared (IR1) channel and water vapor (WV) channel. In the weak echo phase after heavy precipitation, the brightness temperatures of channel IR1 and WV will continue to decrease while the temperature and albedo of channel IR4 continue to increase. Correspondingly, the appearance of the minimum brightness temperatures of channel IR1 and WV is later than the appearance of the maximum echo of the weather radar.

Key words: geostationary meteorological satellite, channel IR4, albedo, precipitation, weather radar