FY-2F卫星和毫米波云雷达云高观测的个例对比分析

Comparison of Cloud Top Height Observation between FY-2F Satellite and Millimeter-Wave Cloud Radar

风云二号静止卫星上装载有可见光、水汽、中长波红外等探测通道,其中红外通道资料可提供卫星云顶温度数据。基于FY-2F静止卫星云顶温度资料,结合局地实时探空数据对北京南郊和朝阳站点上空云层进行云高反演,并展开与地基毫米波云雷达探测云顶高关系的对比,分析3种不同云厚(薄云、适中、厚云)条件下的云高观测结果。研究结果表明,二者云顶高匹配度受几何云厚的影响,其吻合度呈现出厚云最佳,薄云最差的特征。

The FY-2 geostationary satellite spectral data consist of several detection channels,including visible,water vapor,medium-long wavelength infrared and multi-channel.Among these channels,the multi-channel data can provide satellite cloud top temperature data.This paper,based on FY-2 Fsatellite cloud top temperature data,combined with the local real-time ratiosonde data,retrieves the cloud top height from the satellite data of clouds over the southern suburbs of Beijing and makes comparison with the ground-based millimeter-wave cloud radar detection of cloud top height to analyze the cloud top height observation results under the three kinds of cloud thickness.The results indicate that the match degree of two sorts of measurements is affected by the geometric cloud thickness,and the coincidence degree shows the best for thick clouds and the worst for thin clouds.