祁连山一次降水过程云模式模拟参数的选择及微物理结构特征分析

doi:10.13866/j.azr.2022.06.03

Abstract

Abstract:

Using the measured data and cloud model, the precipitation process of a typical stratocumulus system in the Qilian Mountain is numerically simulated. The influence of parameter selection on the simulation results is discussed, and its microphysical structure characteristics are analyzed. The results show that the optimal parameter of the Qilian Mountain cloud model is the Thompson scheme. The content distribution of various aquatic products shows a single peak. The values of graupel and snow mixing ratios near 01:00 and 4.5 km can reach 0.1 g·kg^-1 and 0.7 g·kg^-1, respectively. There is abundant supercooled water in this height layer. From the spatial distribution and temporal correlation of the five aquatic products, the melting of graupel and snow has a significant contribution to rainwater formation. In the vertical direction, the cloud system presents a layered structure of “catalysis supply”: The highest layer above 8 km is the coexistence area of ice crystals and snow, and the supercooling area above the zero-layer (4.5 km), with graupel particles, cloud water, and rainwater at the same time. This cloud structure is conducive to forming precipitation and artificial precipitation enhancement in the Qilian Mountain.

Key words: Qilian Mountains, cloud mode, simulation parameters, microphysical structure, characteristics

ZHANG Wenyu,REN Jing,FU Danhong,KONG Lingbin,TIAN Shuo. Selection of cloud model simulation parameters and analysis of microphysical structure characteristics of the precipitation process in the Qilian Mountains[J].Arid Zone Research, 2022, 39(6): 1717-1727.

Figures/Tables 12

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References 22

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	d01	d02	d03
网格距	27 km	9 km	3 km
格点数	115×91	154×124	235×220
垂直层	34	34	34
模式顶高	50 hPa	50 hPa	50 hPa
积云参数化方案	Grell-Devenyi	Grell-Devenyi	Grell-Devenyi
边界层方案	BMJ	BMJ	BMJ
陆面过程方案	RUC	RUC	RUC
长波辐射方案	RRTM	RRTM	RRTM
云微物理方案	Thompson Morrison2-mom WSM3 WDM6	Thompson Morrison2-mom WSM3 WDM6	Thompson Morrison2-mom WSM3 WDM6
表面层方案	Eta	Eta	Eta
短波辐射方案	Goddard	Goddard	Goddard

方案名称	质量浓度比	数浓度比
Morrison2-mom	qc,qr,qi,qs,qg	nr,ni,ns,ng
Thompson	qc,qr,qi,qs,qg	nr,ni
WSM3	qc,qi,qs	无
WDM6	qc,qr,qi,qs,qg	无

降水等级	24 h降水量/mm	站点个数
小雨/阵雨	0.1~9.9	121
中雨	10.0~24.9	24
大雨	25.0~99.9	5

Selection of cloud model simulation parameters and analysis of microphysical structure characteristics of the precipitation process in the Qilian Mountains

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