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October 1, 1989Journal of the Atmospheric Sciences5,491 citations

Numerical Study of Convection Observed during the Winter Monsoon Experiment Using a Mesoscale Two-Dimensional Model

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JDJimy Dudhia

Key Points

  • The study aims to simulate convection during the Winter Monsoon using a mesoscale model, focusing on heating mechanisms and their effects.
  • Applied a two-dimensional Pennsylvania State University mesoscale model to Winter Monsoon Experiment data.
  • Included parameterizations for ice phase processes, moisture, and radiation with a diurnal cycle.
  • Employed Frank and Cohen's cumulus parameterization scheme for unresolved vertical transports.
  • Ice phase processes significantly influence the level of maximum large-scale heating and vertical motion.
  • The model effectively represents convection initiation over the South China Sea and surrounding areas.
  • Heating mechanisms related to the stratiform cloud deck are crucial for understanding diurnal convection patterns.

Abstract

Abstract A two-dimensional version of the Pennsylvania State University mesoscale model has been applied to Winter Monsoon Experiment data in order to simulate the diurnally occurring convection observed over the South China Sea. The domain includes a representation of part of Borneo as well as the sea so that the model can simulate the initiation of convection. Also included in the model are parameterizations of mesoscale ice phase and moisture processes and longwave and shortwave radiation with a diurnal cycle. This allows use of the model to test the relative importance of various heating mechanisms to the stratiform cloud deck, which typically occupies several hundred kilometers of the domain. Frank and Cohen's cumulus parameterization scheme is employed to represent vital unresolved vertical transports in the convective area. The major conclusions are: Ice phase processes are important in determining the level of maximum large-scale heating and vertical motion because there is a strong anvil componen...

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Jimy Dudhia (1989) studied this question.

synapsesocial.com/papers/69d969ea8988aeabbe6853c1https://doi.org/10.1175/1520-0469(1989)046<3077:nsocod>2.0.co;2
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