Four-dimensional data assimilation for coupled physical-acoustic fields
Abstract
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.
Rights
This 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.Collections
Related items
Showing items related by title, author, creator and subject.
-
Determining New System Design Requirements to Optimize Fleet Level Metrics under Uncertainty
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 ... -
The assimilation of satellite altimeter data into a global eddy resolving ocean model
Tokmakian, Robin Telrud (Monterey, California. Naval Postgraduate School, 1997-06);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 ...