4DVAR data assimilation in the Intra-Americas Sea with the Regional Ocean Modeling System (ROMS) |
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| Institution: | 1. Institute of Marine Sciences, University of California, Santa Cruz, CA 95064, USA;2. Institute of Marine and Coastal Sciences, Rutgers University, New Brunswick, NJ, USA;3. Department of Ocean Sciences, University of California at Santa Cruz, CA, USA;4. School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, USA;5. NWRA, Colorado Research Associates Division, Boulder, CO, USA;6. Joint Institute for Marine and Atmospheric Research, University of Hawai’i, Manoa, HI, USA;7. NOAA Southwest Fisheries Science Center, Environmental Research Division, Santa Cruz, CA, USA |
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| Abstract: | We present the background, development, and preparation of a state-of-the-art 4D variational (4DVAR) data assimilation system in the Regional Ocean Modeling System (ROMS) with an application in the Intra-Americas Sea (IAS). This initial application with a coarse model shows the efficacy of the 4DVAR methodology for use within complex ocean environments, and serves as preparation for deploying an operational, real-time assimilation system onboard the Royal Caribbean Cruise Lines ship Explorer of the Seas. Assimilating satellite sea surface height and temperature observations with in situ data from the ship in 14 day cycles over 2 years from January 2005 through March 2007, reduces the observation-model misfit by over 75%. Using measures of the Loop Current dynamics, we show that the assimilated solution is consistent with observed statistics. |
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