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P.F.J. Lermusiaux, P.J. Haley, Jr., W.G. Leslie, O. Logutov Massachusetts Institute of Technology
This research sponsored by the Office of Naval Research. |
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Background information MIT Activities and Findings 2008 QPE Pilot Study Real-Time Results Additional QPE Links QPE Group Meeting Presentations |
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Building on discoveries made over the previous five years in probabilistic sonar performance prediction, integrated ocean-acoustic modeling, multidisciplinary data assimilation, ocean predictability, multi-scale custom climatologies and autonomous underwater platforms, the Quantifying, Predicting and Exploiting Uncertainty initiative will integrate these discoveries to improve performance prediction and reduce sonar detection uncertainties. To demonstrate how the components fit together and how a future end-to-end system could work in support of fleet exercises, an integrated field demonstration is scheduled for 2009 in this East China Sea - Taiwan - Kuroshio region.
The DRI objectives are to:
The page below presents the results of simulations of the advection of passive tracers North of Taiwan that were carried out using the Smith and Sandwell bathymetry, v9 (2007). The tracers are continually introduced at set of possible mooring locations and then advected/mixed by the dynamical ocean model equations (without wind or tidal forcing). A goal of these simulations is to estimate the influence of measurements made at those locations. This work is part of our preparation for the DRI-QPE (ONR-sponsored), in response to a request by Dr. Ren-Chieh Lien from U. Washington, APL.
The following two links contain the main results and files for two sets of simulations that we have carried out for the Taiwan region. In each case, simulations are initialized from a regional summer climatology that we have created using the Hydrobase software and quality-controlled data also from HydroBase. The horizontal resolution is 3km and 44 terrain-following levels are used in the vertical.
The above two sets of simulations have different bathymetries. The first set is based on the Smith and Sandwell Bathymetry (courtesy of Brian Calder). The second set is based on the NCOR bathymetry (National Center for Ocean Research, National Taiwan University, courtesy of Dr. San Jan). The smoothing of these bathymetries is also different, aiming to tune to amplitude of the vertical velocities for a fixed horizontal resolution of 3km. Bathymetries are presented in:
A main physical ocean dynamics result of the above two sets of simulations is that the transport through the Taiwan Strait has a significant influence on the formation and strength of the cold dome north of Taiwan, that independently of the bathymetry utilized. Secondly, the amplitudes of the vertical velocities are sensitive to the slope of the bathymetry utilized and horizontal resolutions and mixing parameterizations. Further studies are underway.
