On multidecadal and quasi-decadal North Atlantic variability.

Alvarez-Garcia, F., Latif, Mojib and Biastoch, Arne (2008) On multidecadal and quasi-decadal North Atlantic variability. Open Access Journal of Climate, 21 (14). pp. 3433-3452. DOI 10.1175/2007JCLI1800.1.

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Observed sea surface temperatures (SSTs) in the North Atlantic from 1958 through 2000, as well as data from an ocean model simulation driven with the atmospheric variability observed during the same period, are examined using multichannel singular spectrum analysis. The two leading oscillatory modes are associated with a multidecadal and a quasi-decadal period. The former is connected to a basinwide uniform SST pattern and changes in the deep North Atlantic meridional overturning circulation. The quasi-decadal mode involves a tripolar SST anomaly pattern forced by atmospheric variability with a spatial structure resembling that of the North Atlantic Oscillation (NAO). The upper ocean’s dynamical response to this NAO variability provides an instantaneous positive feedback to the SST pattern, while a delayed negative feedback is due to shallow overturning circulation anomalies.

Document Type: Article
Keywords: Meteorology; Climatology; North Atlantic climate variability, sea surface temperature, overturning circulation, wind-driven circulation, North Atlantic Oscillation, forced ocean simulation, multichannel singular spectrum analysis
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-TM Theory and Modeling
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-ME Maritime Meteorology
Kiel University
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
Open Access Journal?: No
Publisher: AMS (American Meteorological Society)
Projects: Future Ocean, ENSEMBLES, DYNAMITE, SFB460
Date Deposited: 23 Apr 2009 15:20
Last Modified: 23 Sep 2019 22:36
URI: https://oceanrep.geomar.de/id/eprint/7533

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