A Three-Dimensional Icosahedral Grid Advection Scheme Preserving Monotonicity and Consistency with Continuity for Atmospheric Tracer Transport

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  • NIWA Yosuke
    Atmosphere and Ocean Research Institute, The University of Tokyo
  • TOMITA Hirofumi
    Research Institute for Global Change/Japan Agency for Marine–Earth Science and Technology
  • SATOH Masaki
    Atmosphere and Ocean Research Institute, The University of Tokyo Research Institute for Global Change/Japan Agency for Marine–Earth Science and Technology
  • IMASU Ryoichi
    Atmosphere and Ocean Research Institute, The University of Tokyo

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A tracer advection scheme for a three-dimensional icosahedral grid model is developed. Then, its tracer transport performance is evaluated using realistic flow fields. The consistency with continuity (CWC) scheme is newly introduced to a three-dimensionally monotonic scheme using existing techniques of an upwind-biased scheme and the intermediate density method. The CWC guarantees mass conservation and Lagrangian conservation, both of which are important properties for tracer transport. In addition, the scheme is positive definite. This transport scheme is implemented with the nonhydrostatic icosahedral atmospheric model and transport simulations are performed. A comparison with radon observations reveals that the proposed method reproduces high-concentration events more realistically than the original method does. Furthermore, results show that the proposed method has less numerical diffusion and is superior to the original method in terms of a sharper gradient.

収録刊行物

  • 気象集誌. 第2輯

    気象集誌. 第2輯 89 (3), 255-268, 2011

    公益社団法人 日本気象学会

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