Advanced search
Start date
Betweenand
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Holocene shifts of the Subtropical Shelf Front off southeastern South America controlled by high and low latitude atmospheric forcings

Full text
Author(s):
Bender, Vera B. [1] ; Hanebuth, Till J. J. [1] ; Chiessi, Cristiano M. [2]
Total Authors: 3
Affiliation:
[1] Univ Bremen, MARUM Ctr Marine Environm Sci, DE-28359 Bremen - Germany
[2] Univ Sao Paulo, Escola Artes Ciencias & Humanidades, Sao Paulo - Brazil
Total Affiliations: 2
Document type: Journal article
Source: PALEOCEANOGRAPHY; v. 28, n. 3, p. 481-490, SEP 2013.
Web of Science Citations: 12
Abstract

Over the Uruguayan shelf and uppermost slope, the coalescence of northward flowing Subantarctic Shelf Water and southward flowing Subtropical Shelf Water forms a distinct thermohaline front termed the Subtropical Shelf Front (STSF). Running in a SW direction diagonally across the shelf from the coastal waters at 32 degrees S toward the shelf break at ca. 36 degrees S, the STSF represents the shelfward extension of the Brazil-Malvinas Confluence zone. This study reconstructs latitudinal STSF shifts during the Holocene based on benthic foraminifera O-18 and C-13, total organic carbon, carbonate contents, Ti/Ca, and grain size distribution from a high-accumulation sedimentary record located at an uppermost continental-slope terrace. Our data provide direct evidence for: (1) a southern STSF position (to the South of the core site) at the beginning of the early Holocene (>9.4calka BP) linked to a more southerly position of the Southern Westerly Winds in combination with restricted shelf circulation intensity due to lower sea level; (2) a gradual STSF northward migration (bypassing the core site toward the North) primarily forced by the northward migration of the Southern Westerly Winds from 9.4calka BP onward; (3) a relatively stable position of the front in the interval between 7.2 and 4.0calka BP; (4) millennial-scale latitudinal oscillations close to 36 degrees S of the STSF after 4.0calka BP probably linked to the intensification in El Nino Southern Oscillation; and (5) a southward migration of the STSF during the last 200years possibly linked to anthropogenic influences on the atmosphere. (AU)

FAPESP's process: 11/50394-0 - Variability of the South American monsoon system of the last three millennia integrating lake, speleothem and marine records
Grantee:Francisco William da Cruz Junior
Support type: Research Program on Global Climate Change - Regular Grants
FAPESP's process: 10/09983-9 - Sea surface temperature changes in the Western South Atlantic and precipitation variability in southeastern South America since the Last Glacial Maximum
Grantee:Cristiano Mazur Chiessi
Support type: Regular Research Grants
FAPESP's process: 12/17517-3 - Response of the Western Atlantic Ocean to changes in the Atlantic meridional overturning circulation: from millennial to seasonal variability
Grantee:Cristiano Mazur Chiessi
Support type: Research Program on Global Climate Change - Young Investigators