Is the decadal variability in the tropical Atlantic a precursor to the NAO?
In the past two decades climate research in the tropical Atlantic with respect to the inter-hemispheric gradient of sea surface temperature (SST) emphasized the predominance of decadal-scale variability. Our results show that this mode of variability is prevalent only for part of the last 130-years...
| Published in: | Annales Geophysicae |
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| Main Authors: | , , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Copernicus Publications
2008
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| Subjects: | |
| Online Access: | https://doi.org/10.5194/angeo-26-4075-2008 https://noa.gwlb.de/receive/cop_mods_00030806 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00030760/angeo-26-4075-2008.pdf https://angeo.copernicus.org/articles/26/4075/2008/angeo-26-4075-2008.pdf |
| Summary: | In the past two decades climate research in the tropical Atlantic with respect to the inter-hemispheric gradient of sea surface temperature (SST) emphasized the predominance of decadal-scale variability. Our results show that this mode of variability is prevalent only for part of the last 130-years record (the 1880s, the 1920s and, especially, the 1970s). There is a lag of a few months between the decadal variations of the inter-hemispheric gradient of SST and the decadal variability of the North Atlantic Oscillation (NAO). This seems to indicate that the 10-year variability first develops in the tropics and then propagates polewards. The inter-hemispheric gradient of SST mode should be thought as episodic and not as a periodic oscillation. |
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