The Annual Peak in the SST Anomaly Spectrum

Möller, Jens, Dommenget, Dietmar and Semenov, Vladimir (2008) The Annual Peak in the SST Anomaly Spectrum Journal of Climate, 21 (12). pp. 2810-2823. DOI 10.1175/2007JCLI2025.1.

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The manner in which monthly mean sea surface temperature anomalies (SSTAs) show enhanced variance at the annual period in the extratropics (an annual peak in the variance spectrum) is illustrated by observations and model simulations. A mechanism, related to the reemergence of winter SST anomalies, is proposed to explain the annual peak in SST spectrum. The idea is supported by the analysis of a hierarchy of models, including Intergovernmental Panel on Climate Change model simulations.

The results of the model experiments further suggest that the annual peak is either weak or absent if decadal SST variability is forced by local air–sea interaction. However, if ocean subsurface temperature variability forces decadal SST variability, the annual peak is much stronger. Strong annual peaks may therefore be seen as an indication of ocean-forced decadal SST variability in the extratropics.

Document Type: Article
Keywords: Sea surface temperature; Air-sea interaction; Mixed layer
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-ME Maritime Meteorology
OceanRep > Leibniz Institute of Marine Sciences
Refereed: Yes
DOI etc.: 10.1175/2007JCLI2025.1
ISSN: 0894-8755
Projects: SFB460
Date Deposited: 14 Jan 2009 13:55
Last Modified: 24 Aug 2017 10:35

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