Four-dimensional data assimilation for coupled physical-acoustic fields
MetadataShow full item record
The estimation of oceanic environmental and acoustical fields is considered as a single coupled data assimilation problem. The four-dimensional data assimilation methodology employed is Error Subspace Statistical Estimation. Environmental fields and their dominant uncertainties are predicted by an ocean dynamical model and transferred to acoustical fields and uncertainties by an acoustic propagation model. The resulting coupled dominant uncertainties define the error subspace. The available physical and acoustical data are then assimilated into the predicted fields in accord with the error subspace and all data uncertainties. The criterion for data assimilation is presently to correct the predicted fields such that the total error variance in the error subspace is minimized. The approach is exemplified for the New England continental shelfbreak region, using data collected during the 1996 Shelfbreak Primer Experiment. The methodology is discussed, computational issues are outlined and the assimilation of model-simulated acoustical data is carried out. Results are encouraging and provide some insights into the dominant variability and uncertainty properties of acoustical fields.
RightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
Showing items related by title, author, creator and subject.
Crossley, William (Monterey, California. Naval Postgraduate School, 2017-07); PUR-AM-17-208Traditional approaches to design and optimize a new system often do not consider how the operator will use this new system alongside the other existing systems. This ﾓhand-offﾔ between the designs of the new system and how ...
Contribution of atmospheric forcing to cooling of the Arabian Sea during onset of the southwest monsoon Gillard, David W. (1986-06);The rapid cooling of the mixed layer in the Arabian Sea during the southwest monsoon onset is examined. The atmospheric forcing fields over the Arabian Sea during the onsets in 1979, 1984, and 1985 are analyzed. Realistic ...
Tokmakian, Robin Telrud (Monterey, California. Naval Postgraduate School, 1997);Two assimilation experiments have been conducted using the Semtner/Chervin Parallel Ocean Climate Model at 1/40 resolution to investigate the dynamical changes which occur with the application of the nudging method to ...