Numerical Study of the Impact of Complex Terrain and Soil Moisture on Convective Initiation

被引：6

作者：

Zan, Beilei ^{[1
,2
]}

Yu, Ye ^{[1
,2
,3
,4
]}

Dong, Longxiang ^{[1
,3
,4
]}

Li, Jianglin ^{[1
,3
,4
]}

Zhao, Guo ^{[1
,3
,4
]}

Zhang, Tong ^{[1
,3
,4
]}

机构：

[1] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Land Surface Proc & Climate Change Cold &, Lanzhou 730000, Gansu, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[3] Pingliang Land Surface Proc & Severe Weather Res, Pingliang 744015, Peoples R China

[4] Gansu Land Surface Proc & Severe Weather Observat, Pingliang 744015, Peoples R China

来源：

ATMOSPHERE | 2020年 / 11卷 / 08期

基金：

中国国家自然科学基金;

关键词：

land-atmosphere interaction; weak synoptic-scale forcing; terrain; soil moisture; STORM IDENTIFICATION; LOESS PLATEAU; MODEL; PRECIPITATION; FORECASTS; EXPLICIT; PREDICTABILITY; SIMULATIONS; VARIABILITY; PERFORMANCE;

D O I：

10.3390/atmos11080871

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The relative importance of topography and soil moisture on the initiation of an afternoon deep convection under weak synoptic-scale forcing was investigated using the weather research and forecasting (WRF) model with high resolution (1.33 km). The convection occurred on 29 June 2017, over the Liupan Mountains, west of the Loess Plateau. The timing and location of the convective initiation (CI) simulated by the WRF model compared well with the radar observations. It showed that the warm and humid southerly airflow under 700 hPa was divided into east and west flows due to the blockage of the Liupan Mountains. The warm and humid air on the west side was forced to climb along the slope and enhanced the humidity near the ridge. The accumulation of unstable energy in the middle and north of the ridge led to a strong vertical convergence and triggered the convection. Sensitivity experiments showed that terrain played a dominant role in triggering the convection, while the spatial heterogeneity of soil moisture played an indirect role by affecting the local circulation and the partition of surface energy.

引用

页数：15

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