Acoustic Description of South Atlantic Ocean Warm Core Eddy

This document contains the viewgraph presentation which investigates the thermohaline/baroclinic scales of the meso-scale eddies associated within the Brazil Malvinas (Falkland) Confluence. One of the eddies investigated was a warm core anti-cyclonic eddy centered about 43 deg 50 min S and 54 deg 15...

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Bibliographic Details
Main Authors: Petitpas,Linda S, Browning,David G
Other Authors: NAVAL UNDERWATER SYSTEMS CENTER NEWPORT RI
Format: Text
Language:English
Published: 1986
Subjects:
Acoustics
*EDDIES(FLUID MECHANICS)
*SOUND TRANSMISSION
*SEA WATER
SOURCES
TEMPERATURE
CONDUCTIVITY
EDGES
DEPTH
SURFACES
RECEIVERS
CROSS SECTIONS
DUCTS
CONVERGENCE
EXTERNAL
SALINITY
RAY TRACING
UNDERWATER ACOUSTICS
BATHYTHERMOGRAPH DATA
TRANSMISSION LOSS
BRAZIL
SHALLOW DEPTH
ACOUSTIC CHANNELS
SOUTH ATLANTIC OCEAN
Brazil Malvinas Confluence
Baroclinicity
GRASS model
LPN-NUSC- 733P83
Orleans
Pacific
South Atlantic Ocean
Online Access:http://www.dtic.mil/docs/citations/ADA166323
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA166323
Description
Summary:This document contains the viewgraph presentation which investigates the thermohaline/baroclinic scales of the meso-scale eddies associated within the Brazil Malvinas (Falkland) Confluence. One of the eddies investigated was a warm core anti-cyclonic eddy centered about 43 deg 50 min S and 54 deg 15 min W (18-19 October) with a diameter of 125 km. The XBT's and CTD's taken through the eddy were used with a range dependent acoustic prediction ray model (GRASS) to model a cross section of the eddy at 50 Hz comparing propagation loss with source depths of 25, 150, and 500 m and receiver depths of 25, 150, and 500 m. Comparisons were done propagating through the eddy, from the outer edge to the eddy interior, and from the interior to the outer edge. The results were compared with a no eddy, range independent situation. Results showed that due to the presence of a surface duct in the warm core eddy the greatest impact was found propagating a shallow source with a shallow receiver. No effects were seen below 300 m, similar to the North Pacific and Greeland Sea eddies. Presented at the Ocean Sciences Meeting of the American Geophysical Union and the American Society of Limnology and Oceangraphy, New Orleans, LA, 13-17 Jan 86.

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