Time-dependent assimilation of CTD data to an open ocean Rossby wave model
Gunson, James R.
MetadataShow full item record
For two CTD surveys taken two months apart during the 1981 Ocean Tomography experiment southwest of Bermuda, a time-dependent ocean state is estimated that evolves from the first to the second survey. The mesoscale motions are modelled by quasi-geostrophic dynamics, and the ocean model state is represented by freely propagating Rossby waves in the 1st and 2nd baroclinic modes whose time-dependent amplitudes are fit to the data at the two survey times. First the linear dispersion relation is used to evolve the waves in time, then the weak nonlinear interactions between the waves are incorporated into the model. The wave-wave interactions enable the waves in the barotropic mode to enter into the model state evolution as an unknown control variable. Three techniques from optimal control theory are developed and applied to this problem: the Kalman filter / smoother, the adjoint method and dynamic programming. These methods allow the barotropic component of the flow, which is indeterminate from the CTD data, to be estimated.
Submitted in partial fulfillment of the requirements for the degree of Master of Science at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution March 1993
Suggested CitationThesis: Gunson, James R., "Time-dependent assimilation of CTD data to an open ocean Rossby wave model", 1993-03, DOI:10.1575/1912/5536, https://hdl.handle.net/1912/5536
Showing items related by title, author, creator and subject.
Colin de Verdiere, Alain (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1977-08)Stimulated by new evidence from both "in situ" oceanic observations and results from numerical modelling, a laboratory study of quasigeostrophic flow and turbulence in a rotating homogeneous fluid has been undertaken. Two ...
Kim, Kuh (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1975-08)This thesis is made of two separate, but interrelated parts. In Part I the instability of a baroclinic Rossby wave in a two-layer ocean of inviscid fluid without topography, is investigated and its results are applied ...
Kamenkovich, Igor V. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1996-09)This thesis addresses the question of how a highly energetic eddy field could be generated in the interior of the ocean away from the swift boundary currents. The energy radiation due to the temporal growth of non-trapped ...