Accession Number : ADA306621

Title :   Acoustic Velocity Profiling in SYNOP.

Descriptive Note : Final rept. 1 Oct 88-30 Sep 95,

Corporate Author : MIAMI UNIV FL

Personal Author(s) : Johns, William E.

PDF Url : ADA306621

Report Date : 26 FEB 1996

Pagination or Media Count : 5

Abstract : The observational program in SYNOP consisted of three primary moored instrument arrays deployed in the Gulf Stream between Cape Hatteras and 55 deg W, complemented by regional and process-oriented studies using acoustically tracked floats and shipboard observations. One of the moored arrays, called the SYNOP 'Central' Array, consisted of 13 tall current meter moorings and 24 inverted echo sounders (IESs) located within a 30 deg x 30 deg area centered near 37.5 deg N, 68.5 deg W. This location is just upstream of the surface eddy kinetic energy maximum in the Gulf Stream system, but in a region where large meanders continue to amplify rapidly and where frequent interactions between the Gulf Stream and adjacent warm and cold-core rings occur. The principal objectives of this array were (1) to document the structure, transport, and variability of the Gulf Stream at this location, (2) to map the evolution of the current and density fields at sufficient horizontal resolution to carry out meaningful diagnostic studies of mesoscale momentum and vorticity balances, and (3) to collect long enough in-situ records to obtain robust statistics on eddy-mean flow energy transfers related to nonlinear Gulf Stream instability mechanisms. ONR Contract N00014-89-J1139, 'Acoustic Velocity Profiling in SYNOP', supported the development of upward looking Acoustic Doppler Current Profilers (ADCPs) within the SYNOP Central Array to obtain long time series of the upper ocean currents, and subsequent analysis of the data. Technical results from the program regarding the use of upward-looking ADCPs to sample strong near-surface flows were very encouraging.

Descriptors :   *OCEAN CURRENTS, *ACOUSTIC VELOCITY, TIME SERIES ANALYSIS, EDDIES(FLUID MECHANICS), BACKSCATTERING, VORTICES, FLOATS, ACOUSTIC ARRAYS, GULF STREAM, FLOWMETERS, MOORING, ACOUSTIC TRACKING, CAPE HATTERAS.

Subject Categories : Physical and Dynamic Oceanography
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE