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자료유형
학술저널
저자정보
저널정보
한국기상학회 Asia-Pacific Journal of Atmospheric Sciences Journal of the Korean Meteorological Society Vol.42 No.6
발행연도
2006.12
수록면
397 - 410 (14page)

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We investigate possible alternatives of convective triggering processes to increase the amount of rain and the extent of rain areas in simulations of the heavy rainfall over the Korean Peninsula. We propose two alternatives by modifying the triggering function in the Kain-Fritsch cumulus parameterization scheme (hereafter KF). One modification is to use the same triggering process as that in KF by employing temperature perturbation as a function of relative humidity. The other modification is to use turbulent kinetic energy (TKE) as the energy source (E') to overcome convective inhibition (CIN). We apply these modifications to the Weather Research and Forecasting (WRF) model in the case of a Korean heavy rainfall. In an additional experiment, topography is not considered in the modification of the TKE trigger function. The experiment using the convective trigger function of TKE simulates rain areas and the intensity associated with strong convections in a relatively better manner. In this experiment, the TKE trigger function plays a role in initiating the convective process appropriately, and the grid-scale resolvable precipitation increases considerably. Moreover, topography plays an essential role in simulating the amount and distribution of heavy rainfall in the experiment of the TKE trigger function. In the experiment involving the TKE trigger function, the convective initiation can be effectively determined with proper topography. The KF trigger function with TKE is an important component for the improvement of heavy rainfall simulation in a highly moist environment with the effect of terrain over the Korean Peninsula.

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Abstract
1. Introduction
2. Trigger functions
3. The heavy rainfall case
4. Experiments and Results
5. Conclusions
Acknowledgements
REFERENCES

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