Mesoscale variability of the Caribbean Sea from GEOSAT
Andrade Amaya, Carlos Alberto
Nystuen, Jeffrey A.
Wash, Carlyle H.
MetadataShow full item record
Two years of GEOSAT Exact Repeat Mission (ERM) altimetry and wind speed measurements in the Caribbean Sea are used to determine the sea surface height mesoscale variability and to characterize the wind stress field during 1987-88. The alongtrack sea surface anomalies are determined using alongtrack derivatives for the estimation of the mean sea surface height and a least square fit is used to remove the orbital error. Biased points near land were removed and high frequency noise was filtered by using a 70 km spatial running mean. Contours of sea surface height anomalies made by every ERM period detected the formation and evolution of two anticyclonic eddies formed during the "non-windy" tropical season, one each year, with a height signature that reached + 30 cm. No eddies related to the Caribbean Current were apparent during the other seasons. A quasi-permanent cyclonic eddy was detected near the San Andreas Archipelago, confirming model predictions. Seasonal wind speed derived from GEOSAT data agrees with previous studies in the area. The relaxation of the wind after the windy season and the strong meridional wind gradient in the center of the Caribbean coincide with the formation of the anticyclones. This suggests that the wind field influences eddy formation. Anomalies in the averaged wind field were produced by strong synoptic events (hurricanes) which are biased due to the 17 day sampling character of the GEOSAT data.
Approved for public release; distribution is unlimited
Showing items related by title, author, creator and subject.
Campbell, Jeffrey William (Cambridge, Massachusetts : Massachusetts Institute of Technology : Woods Hole Oceanographic Institution, 1988);Part of the N.E. Pacific was studied to evaluate and use altimetric data from the Navy Geodetic Satellite GEOSAT. The zero-order accuracy of the major GEOSAT geophysical data record (GDR) channels was verified, and occasional ...
Structure and variability of the mesoscale circulation in the Caribbean Sea as deduced from satellite altimetry Pibernat, Luis (Monterey, California. Naval Postgraduate School, 1998-06);Four years of Topex/Poseidon (TIP) and European Remote Sensing Satellite (ERS) altimetry data in the Caribbean Sea are used to describe the structure and variability of the mesoscale circulation in this area. These results ...
Shipboard and satellite observations of upper ocean velocity and transport variability in the gulf stream Schubert, David Michael (1990);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 ...