Study on the Characteristics and the Parameterization of Effective Radius in Stratiform Precipitation Warm Cloud of Southeastern China Based on WRF-SBM Simulation
IF 3.8 2区 地球科学Q2 METEOROLOGY & ATMOSPHERIC SCIENCES
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引用次数: 0
Abstract
The study on the characteristic and the parameterization of cloud droplet effective radius (re) is important for the optimization of warm cloud microphysical schemes in numerical models. Based on numerical simulations combined with the four aircraft observations of stratiform warm clouds in Jiangxi, China, this work investigated their microphysical properties, focusing on the evolutionary pattern and the parameterization of re, as well as the correlation between re and the number concentration (Nc) of cloud droplet and liquid water path (LWP). It is found that there is a negative correlation between re and Nc, and the rate of the decrease could be increased by 2–4 times with a strengthening of collision-coalescence process. What's more, the direct introduction of collision-coalescence is conducted based on the existing re parameterization schemes, and the results show that it can perform well in most of collision-coalescence intensities. It is also found that LWP is positively correlated with re when re is less than 12 μm, after which the relationship changes to a negative correlation due to the impact of rainfall intensity.
云滴有效半径(re)的特征和参数化研究对于数值模式中暖云微物理方案的优化具有重要意义。本研究在数值模拟的基础上,结合四架飞机对中国江西平流暖云的观测资料,研究了暖云的微物理特性,重点研究了云滴有效半径(re)的演变规律和参数化,以及云滴有效半径(re)与云滴数量浓度(Nc)和液态水路径(LWP)之间的相关性。研究发现,re 与 Nc 之间存在负相关关系,随着碰撞-凝聚过程的加强,re 的下降速度可提高 2-4 倍。此外,在现有 re 参数化方案的基础上直接引入碰撞凝聚,结果表明它在大多数碰撞凝聚强度下都有良好的表现。研究还发现,当 re 小于 12 μm 时,LWP 与 re 呈正相关,之后由于降雨强度的影响,LWP 与 re 的关系变为负相关。
期刊介绍:
JGR: Atmospheres publishes articles that advance and improve understanding of atmospheric properties and processes, including the interaction of the atmosphere with other components of the Earth system.