Accession Number : AD0818165

Title :   A VOLUME SCATTERING AND OCEANOGRAPHIC STUDY OF AN AREA IN THE EASTERN GULF OF MEXICO.

Descriptive Note : Informal rept.,

Corporate Author : NAVAL OCEANOGRAPHIC OFFICE NSTL STATION MS

Personal Author(s) : Van Schuyler, Peter ; Hunger, Arthur A.

Report Date : MAY 1967

Pagination or Media Count : 48

Abstract : Volume reverberation data from the deep scattering layer and oceanographic data, for June 1966, are presented for an area located in the Gulf of Mexico. Volume scattering strength values are presented for one-third octave bands between 2.5 kHz and 20 kHz. Values of scattering strength range from a minimum of -69db at 2.5 kHz to a maximum of -48 db at 5 kHz. Diurnal variations of scattering strength with frequency are shown; the values decreasing with increasing frequency. Echo sounder records of scattering layers resonant at 12 kHz are examined for one station and the apparent migration rates and layer thicknesses discussed. Oceanographic data, collected coincident with the acoustic data, indicate that the area under investigation is located within Florida Current water. Historical oceanographic data shows that water laying off the west coast of Florida forms a boundary with the Florida current water and that this boundary zone can be expected to approach or transverse the area occasionally. Both the collected acoustic and oceanographic data show little variation from location to location. (Author)

Descriptors :   (*ECHO RANGING, MEXICO GULF), (*OCEAN CURRENTS, MEXICO GULF), UNDERWATER SOUND, SOUND TRANSMISSION, AUDIO FREQUENCY, VERY LOW FREQUENCY, DIURNAL VARIATIONS, FLORIDA, BACKSCATTERING, SALINITY, BATHYTHERMOGRAPH DATA, DEEP WATER, THERMOCLINES, OXYGEN, PHOSPHATES, SILICATES.

Subject Categories : Physical and Dynamic Oceanography
      Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE