Model Coupling SANDY

California Current System (WC12)

Model Coupling TOC
1. Introduction
2. Earth System Modeling Framework (ESMF/NUOPC)
a. Test Case: Hurricane Irene
b. Test Case: Hurricane Sandy
c. Test Case: California Current System
3. Model Coupling Toolkit (MCT)

DATA-WRF-ROMS Coupled Application

SANDY COAWST application 87x65x65 with dx~18 km and dy~24 km (coarser), and 116x86x16 with dx~6 km and dy~8 km (finer)
WRF COAWST application 85x82x48 with dx=dy=30 km (coarser), and 100x100x48 with dx=dy=15 km (finer)
Time stepping: WRF 180 and 60 s, ROMS 30 and 15 s
Coupling Simulation E03: Using ROMS bulk fluxes parameterization
- Sequential and semi-implicit coupling, No Nesting, ESMF/NUOPC library
- Non nested WRF, just coarser grid
- Coupling interval: 180 s (every 6 ROMS timesteps), WRF exports instantaneous fields
- WRF imports SST from DATA and ROMS components
- DATA component reads SST from HyCOM 1/12 dataset, 4500x3298
- ROMS activates BULK_FLUXES, EMINUSP, and LONGWAVE_OUT
- ROMS imports dLWrad, SWrad, Pair, Tair, Qair, rain, Uwind, and Vwind
Coupling Simulation E02: Using WRF surface fluxes parameterization
- Sequential and semi-implicit coupling, No Nesting, ESMF/NUOPC library
- Non nested WRF, just coarser grid
- Coupling interval: 180 s (every 6 ROMS timesteps), WRF exports instantaneous fields
- WRF imports SST from DATA and ROMS components
- DATA component reads SST from HyCOM 1/12 dataset, 4500x3298
- ROMS deactivates BULK_FLUXES, EMINUSP, and LONGWAVE_OUT
- ROMS imports SWrad, Pair, shflux, swflux, sustr, and svstr
Coupling Simulation M01: Using WRF surface fluxes parameterization
- Concurrent nested coupling, COAWST MCT library
- Coupling interval: 180 s, WRF exports instantaneous fields
- ROMS activates ATM2OCN_FLUXES and EMINUSP

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Figure 1: WRF terrain height (left) and ROMS bathymetry (right)

Hurricane Sandy Storm Track

Source: NOAA's National Weather Service

Figure 2: Hurricane Sandy storm track

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Figure 3: WRF sea-surface temperature inputs from HyCOM (left) and merged HyCOM-ROMS (right) for October 28, 2012.

Animation 1: Surface Shortwave Radiation Comparison (W/m²)

Animation 2: Surface Net Heat Flux Comparison (W/m²)

Animation 3: Surface Temperature Comparison (°C)

Animation 4: Surface Freshwater Flux Comparison (m/day): (E-P)*SSS

Animation 5: Surface Salinity Comparison

Animation 6: Free-Surface Comparison (m)

Animation 7: Surface Current Comparison (m/s)

Animation 8: Surface Wind Stress Comparison (N/m²)