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  • 1 Department of Global Architecture, Osaka University, Osaka, Japan
  • | 2 National Center for Atmospheric Research,* Boulder, Colorado
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Introduction

Takemi and Rotunno (2003, hereinafter TR03) examined the relative effects of subgrid-scale mixing and numerical filters in squall-line simulations in an idealized condition of a no-shear environment. TR03 found that simulations using common subgrid models with standard values for the model constants and without explicit numerical filters are characterized by poorly resolved grid-scale convective cells. They suggested that this problem should be controlled by setting eddy viscosity coefficients 1.5 to 2 times larger than the standard values. From a recent communication with Dr. G. Bryan of the National Center for Atmospheric Research, we have learned

Introduction

Takemi and Rotunno (2003, hereinafter TR03) examined the relative effects of subgrid-scale mixing and numerical filters in squall-line simulations in an idealized condition of a no-shear environment. TR03 found that simulations using common subgrid models with standard values for the model constants and without explicit numerical filters are characterized by poorly resolved grid-scale convective cells. They suggested that this problem should be controlled by setting eddy viscosity coefficients 1.5 to 2 times larger than the standard values. From a recent communication with Dr. G. Bryan of the National Center for Atmospheric Research, we have learned

Corresponding author address: Dr. Tetsuya Takemi, Dept. of Environmental Science and Technology, Tokyo Institute of Technology, G5-7, 4259 Nagatsuta, Yokohama, Kanagawa 226-8502, Japan. Email: takemi@depe.titech.ac.jp

Introduction

Takemi and Rotunno (2003, hereinafter TR03) examined the relative effects of subgrid-scale mixing and numerical filters in squall-line simulations in an idealized condition of a no-shear environment. TR03 found that simulations using common subgrid models with standard values for the model constants and without explicit numerical filters are characterized by poorly resolved grid-scale convective cells. They suggested that this problem should be controlled by setting eddy viscosity coefficients 1.5 to 2 times larger than the standard values. From a recent communication with Dr. G. Bryan of the National Center for Atmospheric Research, we have learned

Introduction

Takemi and Rotunno (2003, hereinafter TR03) examined the relative effects of subgrid-scale mixing and numerical filters in squall-line simulations in an idealized condition of a no-shear environment. TR03 found that simulations using common subgrid models with standard values for the model constants and without explicit numerical filters are characterized by poorly resolved grid-scale convective cells. They suggested that this problem should be controlled by setting eddy viscosity coefficients 1.5 to 2 times larger than the standard values. From a recent communication with Dr. G. Bryan of the National Center for Atmospheric Research, we have learned

Corresponding author address: Dr. Tetsuya Takemi, Dept. of Environmental Science and Technology, Tokyo Institute of Technology, G5-7, 4259 Nagatsuta, Yokohama, Kanagawa 226-8502, Japan. Email: takemi@depe.titech.ac.jp

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