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Atmospheric numerical models

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Atmospheric non-hydrostatic models

@Atmospheric non-hydrostatic models (NHMs) are now used for a variety of purposes including forecasting, analysis of meso-scale phenomena, dynamic downscaling in climate change study, and weather modification study. One of the main features of NHMs is their support for explicit calculation relating to cloud formation and precipitation development using cloud microphysics parameterization, which is the primary reason why such models are adopted.

@MRI has developed cloud microphysics parameterizations based on the results of related laboratory experiments. Work has also been carried out to validate NHMs' performance against HYVIS and in-situ aircraft observation data and to subsequently improve NHMs. The Institute studies the interaction of cloud microphysics, thermodynamics and dynamics processes in a variety of clouds and the indirect effects of aerosols on cloud formation and precipitation development.

nhm

Reference model : Detailed bin microphysics box (parcel) model

@MRI has also developed a detailed bin microphysics box (parcel) model in which aerosol particles and hydrometeors are expressed using a multi-dimensional bin spectrum scheme. In this scheme, each liquid hydrometeor has prognostic variables for water mass, soluble aerosol mass and insoluble aerosol mass, while each solid hydrometeor has prognostic variables for water mass, aspect ratio, apparent particle volume corresponding the bulk density of particles, and soluble/insoluble aerosol mass. Microphysical processes such as cloud droplet and ice crystal formation are formulated based on laboratory experiment results, and the performance of the model is validated against the outcomes of cloud chamber experiments.

@The detailed bin microphysics box model helps to bridge the gap between laboratory experiments and the cloud microphysics performance of NHMs.

reference model
reference model