Numerical Simulation for Impact of Combination of Different Cumulus Parameterization Schemes and Initial Fields on Twice Heave Rain in Sichuan Province

HE Guang-bi;CAO Jie

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Plateau Meteorology ›› 2008, Vol. 27 ›› Issue (4) : 787-795.

Numerical Simulation for Impact of Combination of Different Cumulus Parameterization Schemes and Initial Fields on Twice Heave Rain in Sichuan Province

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Abstract

A durative rainstorm occurred in north-eastern of Sichuan during 2~6 September 2004 and an local rainstorm in Chengdu district on 30 June 2004 have been simulated by using MM5 meso-scale numerical model for composite of four kinds of Grell, Kuo, KF and BM cumulus convective parameterization schemes and different initial fields. The simulated performance for the composition of different schemes and different initial values has been analysed. The results show that MM5 model has better performance for simulating the twice heavy rainfall. But there are some difference in the area and the intensity of precipitation for the composition of different parameterization schemes and different initial values. Elementary simulated results indict that the precipitation intensity using NCEP data as initial fields is weaker than that of using T213 data, but precipitation area is more agreeable to the real. Precipitation simulation using T213 data as initial fields is apt to occurrence, but the real did not appear. Simulated height and temperature fields of using T213 data as initial fields avail the effect system's strength, and the simulated humidity, convergence and vertical velocity avail heavy rainfall occurrence. Comparatively, the simulated results using NCEP data is more agreeable to the real. Kuo and Grell schemes are more sensitive to the initial values.

Key words

Sichuan heavy rainfa / Convective parameter / Initial values of T2 / Initial values of NC / Numerical experiment

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HE Guang-bi , CAO Jie. Numerical Simulation for Impact of Combination of Different Cumulus Parameterization Schemes and Initial Fields on Twice Heave Rain in Sichuan Province. Plateau Meteorology. 2008, 27(4): 787-795

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