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Modeling of Wind-Wave-Current Coupled Processes in Hurricanes

Modeling of Wind-Wave-Current Coupled Processes in Hurricanes. Isaac Ginis Yalin Fan Tetsu Hara Biju Thomas Graduate School of Oceanography University of Rhode Island. 62 nd Interdepartmental Hurricane Conference. Wind-Wave-Current Interaction. Wind. Sea state, Sea spray. Atmosphere.

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Modeling of Wind-Wave-Current Coupled Processes in Hurricanes

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  1. Modeling of Wind-Wave-Current Coupled Processes in Hurricanes Isaac Ginis Yalin Fan Tetsu Hara Biju Thomas Graduate School of Oceanography University of Rhode Island 62nd Interdepartmental Hurricane Conference

  2. Wind-Wave-Current Interaction Wind Sea state, Sea spray Atmosphere Current Surface waves Ocean Current Ocean currents

  3. Key Air- Sea Physical Processes in the Coupled Tropical Cyclone-Ocean System

  4. 2D LES BL Model for Roll Vortices 3.0 km, 61 levels 2-4 km 8.0 km, 40 m resolution

  5. 2D LES BL Model for Roll Vortices With Rolls No Rolls

  6. Wave BL Model: Drag Coefficient Sea State Dependence Storm Motion Vector Noel (2007), Helene and Florence (2006), Katrina, Rita, Emily, Dennis (2005), Ivan and Frances (2004), and Isabel and Fabien (2003)

  7. Wave BL Model: Drag Coefficient Sea State Dependence Storm Motion Vector

  8. Flux Budget Model M - total momentum MF - total momentum flux Momentum Flux from Atmosphere ( ) Horizontal wave propagation ( ) Wave growth ( ) Momentum Flux into Currents ( ) Ocean Currents

  9. Flux Budget Model • Idealized Hurricane experiments Holland Hurricane Wind Model Wind Field (m/s) 10 20 30 40 Input parameters: Maximum wind speed (MWS) Radius of MWS (RMW) Central & environmental sea-level pressure TSP = 5m/s Wind speed (m/s) Latitude 0 9 18 Longitude

  10. Flux Budget Model Waves

  11. Wind-wave-current Interaction W at 90 m Currents

  12. Impact Wind-Wave-Current Interaction on Ocean Cooling SST anomaly when as forcing (Control Exp.) SST anomaly in Fully Coupled Exp. — SST anomaly in Control Exp. (oC)

  13. Impact Wind-Wave-Current Interaction on Waves • Hurricane Ivan (2005) track and reconnaissance flight tracks Flight tracks/Scanning Radar Altimeter measurements NASA/Goddard space flight center & NOAA/HRD

  14. Impact Wind-Wave-Current Interaction on Waves • Significant Wave Height Swaths Exp. A Exp B Exp C Longitude Exp. A: WAVEWATCH III wave model (operational model) Exp. B: Coupled wind-wave model Exp. C: Coupled wind-wave-current model

  15. Impact Wind-Wave-Current Interaction on Waves Wave parameters comparison between model and SRA (Courtesy of Ed Walsh) Vertical velocity Wave Direction SRA SRA data number Dominant Wave Length Significant Wave Height SRA data number SRA data number

  16. Air-Sea Coupling Strategies for Tropical Models • In the TC model, the parameterizations of the air-sea heat and momentum explicitly include the a) sea state dependence, b) SST and c) ocean current effects. • The wave model is forced by a) the sea-state dependent momentum flux and b) includes the ocean current effects. • The ocean model is forced by a) the sea-state dependent momentum and energy fluxes calculated from the air-sea flux budget.

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