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논문 기본 정보

자료유형
학술저널
저자정보
Lee, Chung-Hui (Department of Environmental Atmospheric Sciences, Pukyong National University) Cheong, Hyeong-Bin (Department of Environmental Atmospheric Sciences, Pukyong National University) Kang, Hyun-Gyu (Department of Environmental Atmospheric Sciences, Pukyong National University)
저널정보
한국지구과학회 한국지구과학회지 한국지구과학회지 제38권 제2호
발행연도
2017.1
수록면
105 - 114 (10page)

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초록· 키워드

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Two dimensional finite element method with quadrilateral basis functions was applied to the spherical high order filter on the spherical surface limited area domain. The basis function consists of four shape functions which are defined on separate four grid boxes sharing the same gridpoint. With the basis functions, the first order derivative was expressed as an algebraic equation associated with nine point stencil. As the theory depicts, the convergence rate of the error for the spherical Laplacian operator was found to be fourth order, while it was the second order for the spherical Laplacian operator. The accuracy of the new high order filter was shown to be almost the same as those of Fourier finite element high order filter. The two-dimension finite element high order filter was incorporated in the weather research and forecasting (WRF) model as a hyper viscosity. The effect of the high order filter was compared with the built-in viscosity scheme of the WRF model. It was revealed that the high order filter performed better than the built in viscosity scheme did in providing a sharper cutoff of small scale disturbances without affecting the large scale field. Simulation of the tropical cyclone track and intensity with the high order filter showed a forecast performance comparable to the built in viscosity scheme. However, the predicted amount and spatial distribution of the rainfall for the simulation with the high order filter was closer to the observed values than the case of built in viscosity scheme.

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