Asia-Pacific Journal of Atmospheric Sciences

Korean Meteorological Society (한국기상학회)
권호 표지

A Study on the Sensitivity of the Simulations of Typhoon Saomai(2000) to the Cumulus Parameterization and Planetary Boundary Layer Schemes in MM5

Shim, Jae-Kwan;Hong, Song-You Hong

  • Published : 20060000
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Abstract

The objective of this paper is to investigate in detail the sensitivity of a simulation of a tropical cyclone to the cumulus parameterization (CP) and planetary boundary layer (BL) processes by using the Pennsylvania State University-National Center for Atmospheric Research Fifth-Generation Mesoscale Model (MM5). Tests were conducted to determine the sensitivity of the simulation of a typhoon to the CPs, including the Betts-Miller, Grell, Kuo-Anthes, and Kain-Fritsch schemes, and two different planetary boundary layer schemes with a non-local approach, the Medium-Range Forecast (MRF) scheme, and a local approach, the National Center for Environmental Prediction’s Eta model (ETA BL) scheme. Typhoon Saomai that originated in the northern Pacific and hit the Korean peninsula in September 2000 was selected for this study. In general, the track of a simulated tropical cyclone is highly sensitive to the choice of both the CP and BL schemes, whereas its intensity and structure are more sensitive to the choice of the BL scheme alone. The intensity, surface fluxes, and structure of the modeled Saomai can be classified into two groups according to the BL scheme used. Overall, the MRF BL scheme realistically reproduces the intensity and structure of the tropical cyclone, whereas the internal structure of the cyclone is less organized when the ETA BL scheme is employed, except for the Kuo CP scheme that is insensitive to the choice of the BL processes.

Keywords

References

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