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Integrated Ocean Dynamics and Acoustics (IODA)

P.F.J. Lermusiaux, P.J. Haley, Jr.,
W.G. Leslie, A. Phadnis,
M.P. Ueckermann, C. Mirabito,
Nicholas Makris, Dick K.P. Yue

Massachusetts Institute of Technology
Center for Ocean Engineering
Mechanical Engineering
Cambridge, Massachusetts


Project Summary
Ongoing MIT Research
Additional IODA Links
Background Information

 

This research sponsored by the Office of Naval Research

Project Summary

The goal is multi-resolution data-assimilative modeling to study truly multiscale coastal ocean dynamics and their acoustic effects, with an emphasis on resolving internal tides and long nonlinear internal waves and their interactions with the real ocean, including:

This is a collaborative project with the Woods Hole Oceanographic Institute (WHOI) and co-PIs Nicholas Makris and Dick K.P. Yue. This is a Multidisciplinary University Research Initiative (MURI) project.

Background information is available below.

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Ongoing MIT Research

Long-Term Goal

Study the coupled dynamics of ocean, surface and internal waves, seabed and acoustics processes with atmospheric forcing, integrating our ocean-wave-acoustic fields and models, including computational codes. The specific goals are to:

Research group roles:

Shallow Water 2006 (SW06) Re-Analysis

A data-driven re-analysis of SW06 has recently been carried out by the Lermusiaux MSEAS group. In this re-analysis a number of areas have been addressed : improved initial and boundary conditions and feature models (FM) (see below); the vertical discretization now consists of 100 optimized vertical levels; atmospheric forcing now includes improved E-P and direct fluxes from WRF/NOGAPS; updated OTIS tidal forcing; data assimilation is weaker and more frequent with shorter space scales; and model parameters of vertical mixing (wind mixing, PP background mixing), horizontal mixing and bottom friction have been re-evaluated.

An important compenent of the re-analysis was the significant improvement of the model initial and boundary conditions. This was achieved through the inclusion of additional synoptic data (WODB, GTSPP) and pseudo profiles to bolster the shelf-break front; correcting the WOA climatology for the slope to match the 2006 conditions; better defining the shelfbreak T/S front FM (steepness and location of foot); improving the Gulf Stream T/S FM based on synoptic data; and, utilizing transport feature models for the Gulf Stream, slope recirculation gyre and shelfbreak front. Data processing of the data was also improved (extending shallow profiles to the surface; improved deep WOA climatology; corrected SST). The time dependent boundary conditions were also updated to permit better radiation of outgoing waves.

Model output files from the best simulation of the SW06 conditions can be found here.

Reanalysis History
May 2013 Updated time dependent BCs for better radiation; Improved merging WRF & NOGAPS atmospheric forcing; Jan 2013 OTIS Tides
Dec 2012 2011 OTIS Tides; Tuning BCs
Jun 2012 Deep extension of Gulf Stream FM; Improved data processing (extending shallow profiles to the surface; improved deep WOA climatology; corrected SST)
May 2012 100 vertical levels; Additional synoptic data (WODB, GTSPP); Gulf Stream, Shelfbreak Front and Recirculation FMs; Improved Data Assimilation; Improved model parameters

Additional Results

Presentations and Meetings

MSEAS IODA-supported Publications

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Additional IODA Links

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Background information

The goal is multi-resolution data-assimilative modeling to study truly multiscale coastal ocean dynamics and their acoustic effects, with an emphasis on resolving internal tides and long nonlinear internal waves and their interactions with the real ocean, including all coastline, shelf, shelfbreak and deep ocean features, high-resolution steep bathymetry, and atmospheric fluxes as external forcing, as well as stochastic parameterizations of sub-grid scales (nonlinear internal waves and other effects) for 4D hydrostatics models, and new non-hydrostatic HDG schemes in idealized conditions.

Studies also involve coupling of ocean-acoustic models in 4D, using a hierarchy of acoustic codes, in collaboration with MIT PIs and other PIs. The specific research tasks include:

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