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Bidecadal sea level modes in the North and South Atlantic Oceans
Citation
Vianna, ML and Menezes, V, Bidecadal sea level modes in the North and South Atlantic Oceans, Geophysical Research Letters, 40, (22) pp. 5926-5931. ISSN 0094-8276 (2013) [Refereed Article]
Copyright Statement
Copyright 2013 American Geophysical Union
Abstract
The relationship between the North and South Atlantic bidecadal sea level (SL) oscillations during the twentieth century is investigated for the first time using Simple Ocean Data Assimilation reanalysis. Complex empirical orthogonal function analysis of the bidecadal band gives two dominant modes: the first dominating from 1915 to 1965 and the second from 1970 onward. The long-term time-dependent change of mode dominance suggests a structural-type regime shift. The first mode is characterized by states with North and South Atlantic subtropical gyres in phase, while tropical and subpolar regions are in opposite phase relative to them. The second mode is characterized by the subpolar gyre and North subtropical gyre almost in quadrature, with North and South subtropical gyres out of phase. Thermal Rossby waves are very clear only in the second mode. These waves seem to be influenced by bottom topography. Known Atlantic meridional overturning circulation (AMOC) sea level fingerprints and AMOC strength indices are discussed in the bidecadal oscillations context.
Item Details
Item Type: | Refereed Article |
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Research Division: | Earth Sciences |
Research Group: | Oceanography |
Research Field: | Physical oceanography |
Objective Division: | Environmental Management |
Objective Group: | Marine systems and management |
Objective Field: | Measurement and assessment of marine water quality and condition |
UTAS Author: | Menezes, V (Ms Viviane Menezes) |
ID Code: | 91426 |
Year Published: | 2013 |
Web of Science® Times Cited: | 16 |
Deposited By: | IMAS Research and Education Centre |
Deposited On: | 2014-05-19 |
Last Modified: | 2014-06-03 |
Downloads: | 0 |
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