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Effects of organized mesoscale heating on the MJO and precipitation in E3SMv1
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  • Chih-Chieh Chen,
  • Jadwiga H. Richter,
  • Changhai Liu,
  • Mitchell W Moncrieff,
  • Qi Tang,
  • Wuyin Lin,
  • Shaocheng Xie,
  • Philip J. Rasch
Chih-Chieh Chen
NCAR CGD

Corresponding Author:[email protected]

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Jadwiga H. Richter
National Center for Atmospheric Research (UCAR)
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Changhai Liu
National Center for Atmospheric Research (UCAR)
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Mitchell W Moncrieff
National Center for Atmospheric Research (UCAR)
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Qi Tang
Lawrence Livermore National Laboratory (DOE)
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Wuyin Lin
Brookhaven National Laboratory (DOE)
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Shaocheng Xie
Lawrence Livermore National Laboratory
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Philip J. Rasch
Pacific Northwest National Laboratory (DOE)
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Abstract

Mesoscale organization of convection is typically not represented in global circulation models, and hence its influence on the global circulation is not accounted for. A parameterization aiming at representing the dynamical and physical effects of the circulation associated with organized convection, referred to as the multiscale coherent structure parameterization (MCSP), is implemented in the Energy Exascale Earth System Model version 1 (E3SMv1). Simulations are conducted to assess its impact on the simulated climate. Besides E3SMv1 simulations, we performed high-resolution (1 km) simulations using the Weather Research and Forecasting (WRF) Model to determine the temperature tendencies induced by mesoscale convective systems embedded in deep convection. We tuned the free parameters of the MCSP based on the WRF simulations. We found that the MCSP enhances Kevin wave spectra in E3SMv1, improves the representation of the Madden-Julian Oscillation, and reduces model precipitation biases over the tropical Pacific.