WATER MASS CHARACTERISTICS AND GEOSTROPHIC CIRCULATION IN THE SOUTH BRAZIL BIGHT - SUMMER OF 1991

Citation
Ejd. Campos et al., WATER MASS CHARACTERISTICS AND GEOSTROPHIC CIRCULATION IN THE SOUTH BRAZIL BIGHT - SUMMER OF 1991, J GEO RES-O, 100(C9), 1995, pp. 18537-18550
Citations number
24
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Oceanografhy
Journal title
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
ISSN journal
2169-9275 → ACNP
Volume
100
Issue
C9
Year of publication
1995
Pages
18537 - 18550
Database
ISI
SICI code
2169-9275(1995)100:C9<18537:WMCAGC>2.0.ZU;2-C
Abstract
A hydrographic survey on board the German ship FS Victor Hensen was ca rried out in Brazilian coastal waters between Santos (23 degrees 56'S) and Rio de Janeiro (22 degrees 54'S) from January 15 to January 22, 1 991. Analyses of conductivity-temperature-depth (CTD) data collected d uring this cruise show that the geostrophic flow and water mass struct ure of the Brazil Current in that region have characteristics similar overall to those in the better observed Cabo Frio region. The uppermos t 200 m of the water column is dominated by the warm, highly saline Tr opical Water flowing predominantly to the southwest. This flow directi on appears to persist to approximately 900 m, the maximum depth reache d by the CTD casts. The water lying between 250 and 750 m has the char acteristics of South Atlantic Central Water (SACW). Below 750 m, down to 900 m, the water characteristics are those of Antarctic Intermediat e Water. The. thermohaline structure and geostrophic calculations indi cate the presence of a meandering pattern, with a trough that appears to be the early stage of formation of a cold-core eddy over the upper slope region. This feature extends from the surface down to approximat ely 500 m depth and is apparently associated with the intrusion of SAC W onto the continental shelf. The geostrophic computations (with respe ct to two reference levels, 750 and 900 dbar) yield maximum current va lues in the range 0.6-0.7 m s(-1) The southwestward volume transport, averaged over the entire domain, was approximately 7.3 Sv with respect to 750 dbar and 8.8 Sv with respect to 900 dbar.