Atmosphere (대기)

Korean Meteorological Society (한국기상학회)
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Evaluation of Accuracy and Efficiency of Double Fourier Series (DFS) Spectral Dynamical Core

이중 푸리에 급수 분광법 역학코어의 정확도와 계산 효율성 평가

  • Beom-Seok Kim (School of Earth and Environmental Sciences, Seoul National University) ;
  • Myung-Seo Koo (Korea Institute of Atmospheric Prediction Systems) ;
  • Seok-Woo Son (School of Earth and Environmental Sciences, Seoul National University)
  • 김범석 (서울대학교 지구환경과학부) ;
  • 구명서 (차세대수치예보모델개발사업단) ;
  • 손석우 (서울대학교 지구환경과학부)
  • Received : 2023.06.29
  • Accepted : 2023.08.08
  • Published : 2023.08.31
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Abstract

The double Fourier series (DFS) spectral dynamical core is evaluated for the two idealized test cases in comparison with the spherical harmonics (SPH) spectral dynamical core. A new approach in calculating the meridional expansion coefficients of DFS, which was recently developed to alleviate a computational error but only applied to the 2D spherical shallow water equation, is also tested. In the 3D deformational tracer transport test, the difference is not conspicuous between SPH and DFS simulations, with a slight outperformance of the new DFS approach in terms of undershooting problem. In the baroclinic wave development test, the DFS-simulated wave pattern is quantitatively similar to the SPH-simulated one at high resolutions, but with a substantially lower computational cost. The new DFS approach does not offer a salient advantage compared to the original DFS while computation cost slightly increases. This result suggests that the current DFS spectral method can be a practical and alternative dynamical core for high-resolution global modeling.

Keywords

Acknowledgement

본 논문의 개선을 위해 좋은 의견을 제시해 주신 두 분의 심사위원께 감사를 드립니다. 이 연구는 환경부의 재원을 지원받아 한국환경산업기술원 "신기후 체제 대응 환경기술개발사업"의 연구개발을 통해 창출되었습니다(2022003560004).

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