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Upper Ocean Response to 2002 Hurricanes Isidore and Lili in Tandem
Wei ZhaoShuyi S. Chen and Joseph Tenerelli
Rosenstiel School of Marine and Atmospheric ScienceUniversity of Miami
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ATMOS. MODEL(MM5/COAMPS/WRF)
OCEAN MODEL(HYCOM or 3DUOM)
WAVE MODEL
(WAVEWATCH III or WAM)
Wave-Induced stress
Surface Wind
Surface fluxes and stress
SST
SSH
& cu
rrent
velo
city
Wav
e-In
duce
d stre
ss
Coupled Atmosphere-Wave-Ocean Modeling System for Hurricane Predictions
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Coupled Modeling System
•MM5 (PSU/NCAR)(vortex-following nests with 45, 15, 5, and 1.67 km grid
spacing, NCEP analysis and AVHRR or TMI/AMSR-E SST)•WAVEWATCH III (NOAA/EMC)
(1/6o, 25 frequency bands, 48 directional bands)•HYCOM (UMiami/NRL)
(1/12o, 22 vertical levels with 4-6 in the ocean mixed layer)•3DUOM (WHOI’s 3-D Upper Ocean Circulation Models)
(15 km, 30 vertical levels with 4-6 in the ocean mixed layer)
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Before Bonnie
After Bonnie... .
...
..
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Hurricanes Isidore and Lili (2002) in tandem
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Objectives
To examine the upper ocean circulation in response to a dual hurricane passage in the Gulf of Mexico.
To test HYCOM performance under high-resolution, complex atmospheric forcing.
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HYCOM Configuration• one-way nested Western Atlantic-Gulf of Mexico-
Caribbean Sea regional domain with data assimilation of SSH and SST prior to hurricane simulations
• 0.08 degree grid spacing• 22 Vertical layer, 4-6 layers in mixed layer with the
1st layer at 3 meter • MM5 atmospheric forcing, 17 August – 17 October
2002 (1.67-km grid resolution during Hurricanes Isidore and Lili, 45-km in pre- and post-hurricane periods)
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AUG17 SEP18SEP08 OCT04SEP27 SEP30 OCT17
MODAS SST data
assimilationHurricane
IsidoreHurricane
Lili
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Hurricane Isidore Hurricane Lili
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SSHA (satellite)
SST/SSC (HYCOM)
Pre-Isidore
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SatelliteSST pre- and post-Isidore
HYCOM
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HYCOM
Satellite
SST Cooling post-Isidore
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SatelliteSST pre- and post-Lili
HYCOM
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HYCOM
Satellite
SST Cooling post-Lili
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A B
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B: Loop CurrentA: Gulf Common Water
Isidore Lili Isidore Lili
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satelliteSSH & SST data assimilation
O.M. Smedstad
SSH data assimilation only21 days SST data assimilation