毫米波云雷达与地基微波辐射计联合反演云微物理参数

摘要

Cloud micro-physics parameters can be retrieved more accurately in theory with the use of combining millimeter-wave cloud radar ( MWCR ) and ground-base microwave radiometer ( MWR ) on cloud sounding.The change of retrieved micro-physics parameters and other physical properties in atmosphere were got by analyzing stra-tus and stratocumulus cases during the experiment in Yangjiang, Guangdong in July 2010 and in Nanjing, Jiangsu in March 2015.The results show that:①the micro-physics parameters retrieved by combing MWCR and MWR are fairly reliable compared with the method which only based on MWCR’ s reflectivity and the experience value from actual measurement;②during the growth of stratus cloud, condensation takes effect on the middle and upper parts of the cloud at beginning, while the significant growth of the cloud drops and vertical expending of cloud mostly re-lies on collision-coalescence process.In the stratocumulus which has a large vertical uplifting vertical, the cloud drops grows through collision-coalescence process;③the height of wet areas on low level is roughly consistent with that of stratus cloud.Air uplifting and water vapor flux convergence in certain level provide dynamic and vapor con-ditions for growth of cloud.%使用地基微波辐射计与毫米波云雷达进行主被动遥感联合探测，从理论上能够更准确地反演云微物理参数。分别以2010年7月于广东阳江和2015年3月于江苏南京进行的联合观测试验所获取的数据为例，对其中的层状云、层积云个例进行联合反演微物理参数的试验和分析，获取云演变过程中微物理参数和其他环境场物理量的变化特征。结果表明：①云雷达-微波辐射计联合反演法反演的云微物理参数与基于雷达反射率因子的经验法有较好的一致性，与实测经验值相比，结果比较可靠；②在层状云发展初始阶段，凝结增长作用在云体中上部位置起主要作用，碰并作用主要导致云滴粒子的显著增长和云层垂直方向的延展；在垂直上升速度较大的层积云中，云滴粒子通过碰并作用增长；③低层湿区高度与大范围层状云系出现的高度较为一致，抬升作用和水汽通量的辐合为云的产生提供了动力和水汽条件。