Plateau Meteorology

Plateau Meteorology >

2018 , Vol. 37 >Issue 4: 873 - 885

DOI: https://doi.org/10.7522/j.issn.1000-0534.2018.00008

Simulation on Afternoon Convective Precipitation Triggered by Soil Moisture over the Qinghai-Tibetan Plateau

  • LUAN Lan ,
  • MENG Xianhong ,
  • Lü Shihua ,
  • HAN Bo ,
  • LI Zhaoguo ,
  • ZHAO Lin ,
  • LI Ruiqing
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  • Key Laboratory for Land Process and Climate Change in Cold and Arid Regions, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, Gansu, China;University of Chinese Academy of Sciences, Beijing 100049, China;College of Amospheric Sciences, Chendu University of Informtion Technology Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, Chengdu 610225, Sichuan, China;Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science & Technology, Nanjing 210044, Jiangsu, China;Inner Mongolia Meteorological Observatory, Hohhot, 010020, Inner Mongolia, China

Received date: 2017-09-16

  Online published: 2018-08-28

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Abstract

This study designed sensitive experiments using WRF model and used CTP-HIlow framework to investigate the influences of soil moisture change on triggering and inhibiting the afternoon convective precipitation over the Qinghai-Tibetan Plateau. The results show that WRF model can reproduce the spatial distribution of the precipitation over the Qinghai-Tibetan Plateau. In addition, there are some improvements of the precipitation simulation over the west part of the Qinghai-Tibetan Plateau when soil moisture decreases. In general, the statement of large scale atmospheric circulation dominates the occurrence of the afternoon convective precipitation process, especially in the middle, southwestern and northeastern part of the Qinghai-Tibetan Plateau. The large scale atmospheric circulation caused the triggering and inhibiting afternoon convective precipitation events account for about 60%~90% of the total number of the triggered and inhibited precipitation events. According to the results of the simulation, when soil moisture decreases, there are more positive feedback cases than negative feedback cases between soil moisture and afternoon convective precipitation which means the decreasing of the soil moisture inhibits the occurrence of afternoon convective precipitation in most cases. However, relative smaller proportion of the cases is the decreasing soil moisture that triggers the afternoon convective precipitation which is the negative feedback. The amount of convective precipitation triggered by the negative feedback process accounts for larger proportion in the northwest part which is the arid part of the Qinghai-Tibetan Plateau. It has the center value up to 80% or more. The mechanism of negative feedback is that the decreasing soil moisture increases the surface sensible heat flux which influences the distribution of sensitive heat flux over the Qinghai-Tibetan Plateau. The increased sensible heat flux contributes to the development of the boundary layer which makes the air parcel easier to reach the level of free convection and the occurrence of afternoon convective precipitation. By comparing the values of CTP and HIlow between control and sensitive experiments in different years, to some extent, there are differences between these two years. It means that soil moisture can influence occurrence of afternoon convective precipitation through its influences both on the surface energy and the atmosphere humidity.

Key words： Qinghai-Tibetan Plat; soil moisture; convective precipita; numerical simulation

Cite this article

LUAN Lan , MENG Xianhong , Lü Shihua , HAN Bo , LI Zhaoguo , ZHAO Lin , LI Ruiqing . Simulation on Afternoon Convective Precipitation Triggered by Soil Moisture over the Qinghai-Tibetan Plateau[J]. Plateau Meteorology, 2018 , 37(4) : 873 -885 . DOI: 10.7522/j.issn.1000-0534.2018.00008

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