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Isaac Ginis Il Ju Moon, Tetsu Hara, Biju Thomas University of Rhode Island and Morris Bender

Improving air-sea flux parameterization in the GFDL/URI Coupled Hurricane-Wave-Ocean Model for Transition to Operations. Isaac Ginis Il Ju Moon, Tetsu Hara, Biju Thomas University of Rhode Island and Morris Bender NOAA/GFDL. Collaborations: H. Tolman (EMC/NCEP) E. Walsh (ETL/NOAA)

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Isaac Ginis Il Ju Moon, Tetsu Hara, Biju Thomas University of Rhode Island and Morris Bender

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  1. Improving air-sea flux parameterization in the GFDL/URI Coupled Hurricane-Wave-Ocean Model for Transition to Operations Isaac Ginis Il Ju Moon, Tetsu Hara, Biju Thomas University of Rhode Island and Morris Bender NOAA/GFDL Collaborations: H. Tolman (EMC/NCEP) E. Walsh (ETL/NOAA) S. Belcher (UR, UK)

  2. Drag and Heat Exchange Coefficients vs Wind Speed in the GFDL Operational Model • Based on simple bulk parameterization. • States of growth of wind waves relative to local wind forcing is neglected. Cd Ch

  3. Coupled Wave-Wind (CWW) Model • Near the peak : NCEPWAVEWATCH III wave model. • High frequency part : Equilibrium spectrum model of Hara and Belcher (2002) Two dimensional wave spectrum: Full wave spectrum Near peak High frequency part Wave Boundary Layer Model Explicitly calculates wave-induced stress 25 3 2 1 - max 0 -1 Wind profile and drag coefficient over any given seas

  4. Wave-Wind Simulations in Real Hurricanes

  5. GPS sonde observation under various hurricanes (Powell et al., 2003). Cd estimated from CWW model hurricane simulations WAVEWATCH III • At high wind speeds, Cd levels off and even decrease with wind speed • Under hurricane wind forcing waves areextremely youngat high wind speeds and the young waves producesmall drag. Upper and lower bounds from CWW model

  6. Operational GFDL/URI Model Coupled Hurricane-Wave-Ocean Model Atmosphere Atmosphere GFDL Hurricane Model GFDL(WRF) Hurricane Model Wind & Air Temp. Flux Wind & Air Temp. Flux SST Wave Boundary Model SST SST & Current Wave Spectra Flux Flux Currents, NCEP WAVEWATCH III POM (HYCOM) POM Elevations, & SST Ocean Ocean Waves

  7. Hurricane Ivan, Initial time: 00Z 12 Sep

  8. Hurricane Ivan, Initial time: 00Z 12 Sep

  9. Summary • We have developed acoupled hurricane-wave-ocean by coupling the GFDL/URI hurricane-ocean model with the NCEP WAVEWATCH III wave model and a wave boundary layer model. • Preliminary simulations indicate that the hurricane intensity and structure can be significantly effected by explicit simulations of surface waves. • More real-case simulations will be done in the nearest future to assess the impact of wave coupling on hurricane predictions. • Future work will be directed toward improving the heat flux parameterization in the coupled model and transitioning to the Hurricane WRF.

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