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MESOSCALE MODELING INVESTIGATION OF AIR-SEA INTERACTIONS



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MESOSCALE MODELING INVESTIGATION OF AIR SEA INTERACTIONS OVER THE GULF OF MEXICO FOR A CASE STUDY OF HURRICANE GORDON REMATA Praveena SIMS Jamese REDDY R S Dept of Physics Atmospheric Sciences General Science Jackson State University 1400 J R Lynch Street Just Hall of Science Jackson Mississippi 39217 Phone 601 979 7012 Fax 601 979 3630 Abstract Under the NASA FAR Program a study has been established to investigate Air Sea Interactions associated with the formation and development of Hurricane Gordon in the Gulf of Mexico Hurricane Gordon was a Category 1 storm which formed in the Gulf of Mexico on September 17th 2000 We are using the Penn State NCAR MM5 version 3 modeling system for diagnostic studies of surface fluxes sensible heat latent heat and momentum over the Gulf of Mexico relevant to the air sea interactions in the vicinity of this intense hurricane The MM5 configuration features two nested domains over the Gulf of Mexico with horizontal grid spacing of 90 km and 30 km Nesting between the grids is two ways Physics options selected include non hydrostatic Grell cumulus parameterization on 90 km grid explicit microphysics Reisner on 30 km grid modified Mellor Yamada boundary layer parameterization and a cloud resolving radiation scheme Gridded analysis and rawinsonde data from NCAR were used to construct initial and boundary condition files The model results will be discussed along with relation to other theoretical and modeling studies of air sea interactions in hurricane environments Potential links between the model surface fluxes and precipitation at landfall will be considered I INTRODUCTION Air sea interactions including heat momentum and moisture fluxes play a vital role in the formation and intensification of the hurricanes tropical cyclones In the present study PSU NCAR Mesoscale Modeling system of Version 3 is being used for predicting the formation and structure of the hurricane Gordon which occurred in the Gulf of Mexico during September 14 17



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