Shipboard and satellite observations of upper ocean velocity and transport variability in the Gulf Stream
Schubert, David M.
MetadataShow full item record
KeywordAcoustic surface waves; Oceanus (Ship : 1975-) Cruise OC205; Oceanus (Ship : 1975-) Cruise OC216
Acoustic doppler velocities are combined with velocity profiles generated from XBT measurements to produce estimates of the flow field between Bermuda and the eastern coast of the United States. Repeated shipboard measurements along an ascending GEOSAT subtrack between Bermuda and Cape Cod allow study of rapid Gulf Stream Variability along the track, and comparison of sea surface and velocity measurements with those computed from the GEOSAT altimeter. The shipboard data were taken during two separate cruises on the R/V Oceanus in April and December, 1989. Using mass conservation constraints and inverse techniques, the transport across the Cape Cod Bermuda track has been balanced with transport across additional ship tracks between Bermuda and Cape Hatteras, and between Bermuda and Nova Scotia. The shipboard results show evidence of a rapid barotropic mode which caused changes in transport along the Cape Cod-Bermuda track on the order of 8 Sverdrups in a week period. Comparisons of sea surface velocity and dynamic height determined from the ship's data with measurements made from the GEOSAT altimeter showed a consistent picture of the Gulf Stream location and were also consistent in showing smaller scale variations in flow. The dynamic height difference across the Gulf Stream was approximately 10% higher for the GEOSAT measurements than for the shipboard measurements, which is within the expected errors of the analysis techniques.
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 September 1990
Suggested CitationThesis: Schubert, David M., "Shipboard and satellite observations of upper ocean velocity and transport variability in the Gulf Stream", 1990-09, DOI:10.1575/1912/5417, https://hdl.handle.net/1912/5417
Showing items related by title, author, creator and subject.
The long term upper ocean study (Lotus) : cruise summary and hydrographic data report, Oceanus 141, October 1983 and Oceanus 145, January 1984 Mongomery, Ellyn T.; Pennington, Nancy J.; Briscoe, Melbourne G. (Woods Hole Oceanographic Institution, 1984-07)OCEANUS cruises 141 (28 October-4 November 1983) and 145 (22-29 January 1984) were the tenth and eleventh cruises to the Long Term Upper Ocean Study (LOTUS) area centered at 34°N, 70°W. During OCEANUS 141, a C. S. ...
The Subduction experiment : cruise report R/V Oceanus : cruise number 240 leg 3 : subduction 1 mooring deployment cruise, 17 June-5 July 1991 Trask, Richard P.; Brink, Nancy J. (Woods Hole Oceanographic Institution, 1993-03)Subduction is the mechanism by which water masses formed in the mixed layer and near the surface of the ocean find their way into the upper thermocline. The subduction process and its underlying mechanisms were studied ...
The Subduction experiment : cruise report R/V Oceanus cruise number 250 legs 1 and 2 subduction 2 mooring deployment and recovery cruise, 25 January-26 February 1992 Trask, Richard P.; Brink, Nancy J.; Regier, Lloyd; McPhee, Neil M. (Woods Hole Oceanographic Institution, 1993-03)Subduction is the mechanism by which water masses formed in the mixed layer and near the surface of the ocean find their way into the upper thermocline. The subduction process and its underlying mechanisms were studied ...