University of Colorado
The Naval Research Laboratory Coupled Ocean/Atmosphere Mesoscale Prediction System (COAMPS) is the first limited area model to adopt the Earth System Modeling Framework (ESMF) technology for use in the air-sea coupling problem. The ESMF system is used in two tiers within COAMPS. On the top level, the ESMF superstructure is used to advance the coupled system forward in time. On the lower level, the ESMF regrid infrastructure is used to communicate intra-component grid information across any number of processors.
The image above shows a COAMPS 48-hour simulation of hurricane Katrina. The three-way coupling between COAMPS, the Navy Coastal Ocean Model (NCOM), and the Simulating WAves Nearshore (SWAN) model is achieved through ESMF. This simulation uses three atmospheric domains, two ocean domains, and one wave domain. The innermost atmospheric nest automatically translates along with the storm. COAMPS predicts a cold sea surface temperature anomaly (degrees C, color shaded area) to the right of the hurricane track in response to the passage of the hurricane's high wind speeds (m/s, black contours). The significant wave height (m, white contours) shows increased wave growth on the northern quadrant of the hurricane due to wind-wave-current coupling effects. The white squares denote the observed location of the eye at six hourly intervals and the dotted line denotes the model location of the eye at hourly intervals beginning at 1200 UTC 27 August.
Image courtesy of Sue Chen, Naval Research Laboratory.