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Modeling of Wind-Wave- Current Coupled Processes in Hurricanes Isaac Ginis Yalin Fan Tetsu Hara Biju Thomas Graduate School of Oceanography University.

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Presentation on theme: "Modeling of Wind-Wave- Current Coupled Processes in Hurricanes Isaac Ginis Yalin Fan Tetsu Hara Biju Thomas Graduate School of Oceanography University."— Presentation transcript:

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 62 nd Interdepartmental Hurricane Conference

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

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 8.0 km, 40 m resolution 2-4 km

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

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

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

10 Waves

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

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

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

14  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 Impact Wind-Wave-Current Interaction on Waves

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

16 In the TC model, the parameterizations of the air-sea heat and momentum explicitly include the a) sea state dependence, b) SST and c).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 effectsThe 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. Air-Sea Coupling Strategies for Tropical Models


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