Numerical Experimentation of Local Underlying Surface EffectBased on WRF Model in Three Gorges Area

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Plateau Meteorology
Plateau Meteorology ›› 2011, Vol. 30 ›› Issue (1) : 83-93.

Numerical Experimentation of Local Underlying Surface EffectBased on WRF Model in Three Gorges Area

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Abstract

Based on WRF model, the local effect of the Yangtze River and local topography were studied betweenprecipitation and non\|precipitation events in the Three Gorges area. The results showed that in the process of precipitation event, the underlying surface water bodies provided the local water vapor for precipitation, and the near\|surface valley wind that was forced dynamically by the local bell mouth and canyon terrain increased. The southerly airstream affected by the bell topography carried moisture northward, and the valley easterly wind compelled by ‘narrow pipe’ effect of the canyon terrain increased in the downstream section of the Three Gorges area, which enhanced westerly water vapor transportation that converged on the northward moisture affected by northerly wind in the end of the bell mouth terrain. Meanwhile, the changed underlying surface provided latent heat energy for rainfall. The airflow with water vapor was uplifted compulsorily by local terrain and converged with the dry and cold air caused by the unstable stratification from the height, the latent heat energy released instability to lead to precipitation increasing in theregion. On the other hand, in the process of non-precipitation event, the Yangtze River cancool/warmatthe day/night accordingly, and had cold/warm lake effect. The latent heat concentrated in the end of bellmouth with the water underlying surface imbedding and the terrain action. There was no terrain blocking effect on flow, and the southerly flow and the easterly flow enhanced.The variations of circulation characteristicsuggested that both of the water underlying surface and the local terrain were ineligiblyimportant for the weather in the Three Gorges areain different events.

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Three Gorges area / Underlying surface / Topography / Numerical experiment

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. Numerical Experimentation of Local Underlying Surface EffectBased on WRF Model in Three Gorges Area. Plateau Meteorology. 2011, 30(1): 83-93

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