Numerical Simulation of Impacts of the Tibetan Plateau Heating on a Persistent Heavy Rainfall in Western Sichuan Basin

Yuanchun ZHANG; Juan LI; Jianhua Sun

doi:10.3878/j.issn.1006-9585.2018.17166

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Yuanchun ZHANG, Juan LI, Jianhua Sun. Numerical Simulation of Impacts of the Tibetan Plateau Heating on a Persistent Heavy Rainfall in Western Sichuan Basin[J]. Climatic and Environmental Research, 2019, 24(1): 37-49. doi: 10.3878/j.issn.1006-9585.2018.17166

Citation:

Yuanchun ZHANG, Juan LI, Jianhua Sun. Numerical Simulation of Impacts of the Tibetan Plateau Heating on a Persistent Heavy Rainfall in Western Sichuan Basin[J]. Climatic and Environmental Research, 2019, 24(1): 37-49. doi: 10.3878/j.issn.1006-9585.2018.17166

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Numerical Simulation of Impacts of the Tibetan Plateau Heating on a Persistent Heavy Rainfall in Western Sichuan Basin

doi: 10.3878/j.issn.1006-9585.2018.17166

1.
Key Laboratory of Cloud-Precipitation Physics and Severe Storms, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029
2.
Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, Chengdu 610225
3.
Tianshui Meteorological Bureau, Tianshui, Gansu Province 741000

Funds:

National Natural Science Foundation of China 41505038

National Natural Science Foundation of China 41675045

Open Research Fund Program of Plateau Atmosphere and Environment Key Laboratory of Sichuan Province PAEKL-2015-K1

Received Date: 2017-11-28
Available Online: 2017-12-21
Publish Date: 2019-01-20

Abstract

Abstract

The influence of sensible and latent heat anomalies over the Tibetan Plateau (TP) on a persistent rainfall in western Sichuan Basin is investigated via a semi-idealized mesoscale numerical model WRF (Weather Research and Forecasting) simulation. Analyses of the simulation show that when the heating on the TP is turned off, rainfall decreases in the TP and western Sichuan Basin but increases in central and eastern Sichuan Basin, while the diurnal variation of precipitation weakens; the trough over the TP on 500 hPa disappears, the strength and scope of the westerly trough reduces slightly, but the meso-cyclone at low levels in eastern Sichuan Basin enhances; quantitative analysis of vorticity budget during the heavy rain period indicates that the intensification of vertical wind shear in the lower troposphere makes positive contribution to strengthening the TILT (tilting term) in eastern Sichuan Basin, and thus facilitates vortex development in the key area of Sichuan Basin, which also leads to increases in precipitation in eastern Sichuan Basin.
- Sichuan Basin,
- Persistent heavy rainfall,
- Numerical simulation,
- Tibetan Plateau

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References(31)

References

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