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| Titel |
Regional impacts of ocean color on tropical Pacific variability |
| VerfasserIn |
W. Anderson, A. Gnanadesikan, A. Wittenberg |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 5, no. 3 ; Nr. 5, no. 3 (2009-08-20), S.313-327 |
| Datensatznummer |
250002581
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| Publikation (Nr.) |
 copernicus.org/os-5-313-2009.pdf |
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| Zusammenfassung |
| The role of the penetration length scale of shortwave radiation into the
surface ocean and its impact on tropical Pacific variability is investigated
with a fully coupled ocean, atmosphere, land and ice model. Previous work has
shown that removal of all ocean color results in a system that tends strongly
towards an El Niño state. Results from a suite of surface chlorophyll
perturbation experiments show that the mean state and variability of the
tropical Pacific is highly sensitive to the concentration and distribution
of ocean chlorophyll. Setting the near-oligotrophic regions to contain
optically pure water warms the mean state and suppresses variability in the
western tropical Pacific. Doing the same above the shadow zones of the tropical
Pacific also warms the mean state but enhances the variability. It is shown
that increasing penetration can both deepen the pycnocline (which tends to
damp El Niño) while shifting the mean circulation so that the wind response
to temperature changes is altered. Depending on what region is involved this
change in the wind stress can either strengthen or weaken ENSO variability. |
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