Accession Number : ADA118765

Title :   Sound Speed Structure of the Western South Atlantic Ocean.

Descriptive Note : Final technical note,


Personal Author(s) : Fenner,Don F

Full Text :

Report Date : Jul 1982

Pagination or Media Count : 47

Abstract : The sound speed structure of the western South Atlantic Ocean is far more variable than that found in the North Atlantic or North Indian Oceans, largely due to hemispheric position and a wide variety of surface, near-surface, intermediate depth, and near-bottom water masses. In the South Atlantic, summer is defined as January-March and winter as July-September. The wide variety of temperature and salinity variability throughout the western South Atlantic leads to entirely differently shaped sound speed profiles and entirely different values of the depth of the deep sound channel axis and critical depth. These differences undoubtedly have significant effects on acoustic propagation. This report examines western South Atlantic sound speed variability along three cross-sections for both summer and winter, relates variability in sound speed structures to surface currents, the Antarctic Intermediate Water, Mediterrannean Intermediate Water, and Antarctic Bottom Water core flows west of the Mid-Atlantic Ridge, and defines the number of observations deeper than the depth of the deep sound channel axis during both summer and winter for the entire South Atlantic Ocean between the Equator and 45 S latitude. (Author)

Descriptors :   *Acoustic velocity , Cross sections , South Atlantic Ocean , Underwater sound , Ocean currents , Circulation , Temperature , Salinity , Depth , Profiles , Seasonal variations

Subject Categories : Physical and Dynamic Oceanography

Distribution Statement : APPROVED FOR PUBLIC RELEASE