Precipitation Microphysics of Tropical Cyclones Over the Western North Pacific Based on GPM DPR Observations: A Preliminary Analysis
Precipitation Microphysics of Tropical Cyclones Over the Western North Pacific Based on GPM DPR Observations: A Preliminary Analysis
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基于GPM DPR观测的西北太平洋热带气旋降水微物理：初步分析
DOI：
10.1029/2018jd029454
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发表时间：
2019-03-27
影响因子：
4.4
通讯作者：
Chen, Fengjiao
中科院分区：
文献类型：
--
作者：
Huang, Hao;Chen, Fengjiao
利用全球降水测量卫星(GPM)上的双频降水雷达(DPR)观测资料，分析了不同降水效率指数(PEI)下西北太平洋热带气旋(TC)降水的微物理结构和过程。统计结果表明，对流(层状)降水云2公里处雨滴的平均质量加权平均直径为1.67 mm(1.37 mm)。无论是对流云还是层状云，PEI高的降水云的液态水路径都比非液态水路径高。对流和层状降水的平均D-m随PEI的增大而增大。TCS中对流云和层状降水云的D-m和反射率(Z(E))的垂直廓线随PEI的变化有很大不同。在融化水平以下，低(高)PEI云向地面方向的D-m和Z(E)明显减小(增大)。总体而言，TCS内产生最有效降水的云具有强合并的特征，不仅对于小水滴，而且对于相对较大的雨滴；相反，在PEI较低的对流和层状降水云中，水流星的破裂是主要过程。这些结果将有助于验证和改进云和气候模式中的水流星参数化方案。
Using observations from the dual-frequency precipitation radar (DPR) onboard the Global Precipitation Measurement mission (GPM) satellite, this study analyzes the microphysical structures and processes of tropical cyclone (TC) precipitation over the western North Pacific in terms of different precipitation efficiency indices (PEIs). The statistical results show that the mean mass-weighted mean diameter of raindrops (D-m) at 2km is 1.67mm (1.37mm) for convective (stratiform) precipitating clouds. Precipitating clouds with high PEI have higher liquid water path than nonliquid water path for both convective and stratiform clouds. The mean D-m of convective and stratiform precipitation increases as the PEI increases. The vertical profiles of D-m and reflectivity (Z(e)) for convective and stratiform precipitating clouds in TCs differ substantially as the PEI changes. Below the melting level, there is a clear decrease (increase) in D-m and Z(e) toward the surface for clouds with low (high) PEI. In general, clouds within TCs producing the most efficient precipitation are characterized by strong coalescence, not only for small droplets but also for relatively large raindrops; in contrast, the breakup of hydrometeors is the dominant process in convective and stratiform precipitating clouds with low PEI. These results will help validate and improve the hydrometeor parameterization schemes in cloud and climate models.