Gravity Wave Characteristics in Two Summer Heavy Rainfall in the Qinghai-Xizang Plateau

WU Di; WANG Chenghai; HE Guangbi

doi:10.7522/j.issn.1000-0534.2015.00066

Plateau Meteorology >

2016 , Vol. 35 >Issue 4: 854 - 864

DOI: https://doi.org/10.7522/j.issn.1000-0534.2015.00066

Gravity Wave Characteristics in Two Summer Heavy Rainfall in the Qinghai-Xizang Plateau

WU Di ,
WANG Chenghai ,
HE Guangbi

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Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province, College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China;2. Institute of Plateau Meteorology, China Meteorological Administration, Chengdu 610072, China

Received date: 2015-02-02

Online published: 2016-08-28

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Abstract

For a more comprehensive understanding the impact of mesoscale gravity waves on the occurrence and development of heavy rain over Qinghai-Xizang Plateau, two heavy rainfall events in the eastern part of Tibetan Plateau are simulated by using the mesoscale model WRF (V3.5.1), the gravity wave characteristics and the connection between the heavy rainfall events are investigated. The results show that the simulation results well reproduce the two heavy rainfall process, the propagation characteristics of wave were represented by the alternative movement of vertical velocity and divergence respectively, and the ascending movement is closely associated with the development of precipitation. The analysis of the Richardson number show that vertical shear instability at 5 km to 6 km appears before the waves occur, with the signal of waves intensifying, the vertical shear start to weaken. It is shown that the gravity wave can extract energy from the unstable airflow of vertical shear. Vertical shear and Richardson number can be as an indicator of the heavy rainfall forecast in the downstream. The mesoscale gravity waves in two heavy rains were identified by using the Morlet wavelet method, the gravity waves which have longer wavelength are generated early and disappear late, and which plays an major role in reinforcing the precipitation processes. All above indicate that development of mesoscale gravity wave is one of the dynamic mechanisms resulting in heavy rain and plays an important role in the process of summer heavy rain in the eastern part of Tibetan Plateau. The gravity wave analysis contributes to our understanding of the heavy rain process in the region, and improves prediction ability of the Tibetan Plateau area precipitation.

Key words： Numerical simulation; Gravity wave; Richardson number; Wavelet analysis

Cite this article

WU Di , WANG Chenghai , HE Guangbi . Gravity Wave Characteristics in Two Summer Heavy Rainfall in the Qinghai-Xizang Plateau[J]. Plateau Meteorology, 2016 , 35(4) : 854 -864 . DOI: 10.7522/j.issn.1000-0534.2015.00066

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