Simulations of Microphysics and Precipitation in a Stratiform Cloud Case over Northern China: Comparison of Two Microphysics Schemes
Simulations of Microphysics and Precipitation in a Stratiform Cloud Case over Northern China: Comparison of Two Microphysics Schemes
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DOI：
10.1007/s00376-019-8257-0
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发表时间：
2019-12
影响因子：
5.8
通讯作者：
T. Hou;Hengchi Lei;Zhaoxia Hu;Jiefan Yang;Xingyu Li
中科院分区：
文献类型：
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作者：
T. Hou;Hengchi Lei;Zhaoxia Hu;Jiefan Yang;Xingyu Li
利用气象研究与预报（WRF）模式和两种不同的微物理方案，即预测粒子特性（P3）和Morrison双矩参数化，模拟了2010年4月20-21日的一次层状降水事件。模拟结果与降水和飞机观测结果进行了比较。飞机观测的中等边缘枝晶和板晶表明，在成熟降水阶段，边缘对冰粒生长有显著的促进作用。对枝晶聚集和帽柱的观察表明，聚集与沉积或边化共存，并在产生许多大颗粒中起重要作用。两种方案的24h地面降水累积的区域平均值非常接近。但降水分布的时空演变存在差异。表层降水时间演变分析表明，Morrison地区降水较快，而P3地区降水较慢，降水模式向观测方向东移。两种方案的降水值差异与云水含量分布和水雾颗粒下落速度有关。P3较好地模拟了层状降水事件，因为它捕捉到了质量加权下降速度和密度从非边缘粒子到边缘粒子的逐渐转变。
Using the Weather Research and Forecasting (WRF) model with two different microphysics schemes, the Predicted Particle Properties (P3) and the Morrison double-moment parameterizations, we simulated a stratiform rainfall event on 20-21 April 2010. The simulation output was compared with precipitation and aircraft observations. The aircraft-observed moderate-rimed dendrites and plates indicated that riming contributed significantly to ice particle growth at the mature precipitation stage. Observations of dendrite aggregation and capped columns suggested that aggregation coexisted with deposition or riming and played an important role in producing many large particles. The domain-averaged values of the 24-h surface precipitation accumulation from the two schemes were quite close to each other. However, differences existed in the temporal and spatial evolutions of the precipitation distribution. An analysis of the surface precipitation temporal evolution indicated faster precipitation in Morrison, while P3 indicated slower rainfall by shifting the precipitation pattern eastward toward what was observed. The differences in precipitation values between the two schemes were related to the cloud water content distribution and fall speeds of rimed particles. P3 simulated the stratiform precipitation event better as it captured the gradual transition in the mass-weighted fall speeds and densities from unrimed to rimed particles.