Vertical Motion in the SYNOP Central Array
Rept. for May 1988-Aug 1990
RHODE ISLAND UNIV NARRAGANSETT GRADUATE SCHOOL OF OCEANOGRAPHY
Pagination or Media Count:
As part of the SYNOP Synoptic Ocean Prediction experiment field program, twelve tall moorings measured the Gulf Streams temperature and velocity fields with current meters CM at nominal depths of 400 m, 700 m, 1000 m, and 3500 m for two years, from May 1988 through August 1990. Simultaneously, 24 inverted echo sounders IES monitored the thermocline topography. A third observational component of the experiment was the release of isopycnal RAFOS floats 70 such floats traversed the area monitored by the CM and the IES. This report documents the methods used to compute vertical motion for each data source, and the differences and similarities between the three methods. Typical velocities during strong events, as observed by or inferred from all three instruments, was 1-2 mm s-1 in regions near the center of the Gulf Stream. The comparison of RAFOS vertical motions and vertical motions diagnosed from CM data showed excellent agreement furthermore, CM vertical motions and IES vertical motions are statistically coherent for periods longer than 12 days. We conclude that we may map mesoscale fields of wx,y,t the fields mapped are consistent with quasi-geostrophic dynamics. Gulf Stream, SYNOP, Vertical motion.
- Physical and Dynamic Oceanography