Seasonal Changes in the North Atlantic Subtropical Gyre.

Stramma, Lothar and Siedler, Gerold (1988) Seasonal Changes in the North Atlantic Subtropical Gyre. Open Access Journal of Geophysical Research: Oceans, 93 (C7). pp. 8111-8118. DOI 10.1029/JC093iC07p08111.

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The eastern part of the North Atlantic subtropical gyre is found in the region between the Azores and the Cape Verde Islands. A study of the gyre structure in the area east of 35°W between 8°N and 41°N is presented. The geostrophic flow field determined from historical temperature-salinity data sets by objective analysis indicates seasonal variations in shape but no significant changes in the magnitude of volume transports. The eastern part of the gyre has a larger east-west and smaller north-south extension in summer compared with the winter season. The center shifts by about 2° latitude to the south from winter to summer. Long-term temperature time series (6.5 years) from a mooring near the Azores are consistent with these results, showing always a consistent temperature increase at the beginning of the year which is apparently due to the displacement of the northeastern part of the gyre. A comparison between the mean flow fields and fields obtained from individual zonal sections indicates large deviations north and south of the gyre but small deviations within the gyre.

Document Type: Article
Keywords: Physical oceanography
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-PO Physical Oceanography
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1029/JC093iC07p08111
ISSN: 2169-9275
Date Deposited: 25 Sep 2012 12:23
Last Modified: 26 Sep 2017 11:04

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