Seasonal variations in the western tropical Atlantic: Surface circulation from Geosat altimetry and WOCE model results

Didden, Norbert and Schott, Friedrich (1992) Seasonal variations in the western tropical Atlantic: Surface circulation from Geosat altimetry and WOCE model results Journal of Geophysical Research: Oceans, 97 (C3). p. 3529. DOI 10.1029/91JC02860.

[img] Text
Didden und Schott.pdf - Published Version

Download (2504Kb)

Supplementary data:

Abstract

Sea level variations and geostrophic circulation in the western tropical Atlantic are studied in an intercomparison of Geosat altimetry and the World Ocean Circulation Experiment community model effort high‐resolution model forced with climatological windstress. Overall, the annual cycles of geostrophic current fields of both products compare very well. Special comparison areas are the western North Equatorial Countercurrent (NECC) and the North Brazil Current (NBC) region. Meridional profiles of zonal velocity anomalies show a seasonal meridional migration of the NECC core centered at 5°N and a weaker eastward maximum during fall at 9°N in both products. The Geosat and model seasonal cycles of the NECC core velocity in the region 35°–45°W are highly correlated and agree with respect to the onset of eastward current acceleration and deceleration in May and December, respectively. Geosat time series from November 1986 to June 1989 show year to year differences, in particular an anomalous early NECC acceleration phase in 1987. In the NBC region 54°–58°W, flow anomalies from both Geosat and the model have two westward maxima, in March and June, which appear to be associated with eastward anomalies further offshore.

Document Type: Article
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-PO Physical Oceanography
Refereed: Yes
DOI etc.: 10.1029/91JC02860
ISSN: 2169-9275
Projects: SFB133
Date Deposited: 21 Mar 2018 08:30
Last Modified: 21 Mar 2018 08:30
URI: http://eprints.uni-kiel.de/id/eprint/42311

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...