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| Titel |
Trends in coastal upwelling intensity during the late 20th century |
| VerfasserIn |
N. Narayan, A. Paul, S. Mulitza, M. Schulz |
| 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 ; 6, no. 3 ; Nr. 6, no. 3 (2010-09-22), S.815-823 |
| Datensatznummer |
250003588
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| Publikation (Nr.) |
 copernicus.org/os-6-815-2010.pdf |
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| Zusammenfassung |
| This study presents linear trends of coastal upwelling intensity in the later
part of the 20th century (1960–2001) employing various indices of upwelling,
derived from meridional wind stress and sea surface temperature. The analysis
was conducted in the four major coastal upwelling regions in the world, which
are off North-West Africa, Lüderitz, California and Peru. The
trends in meridional wind stress showed a steady increase of intensity from
1960–2001, which was also reflected in the SST index calculated for the same
time period. The steady cooling observed in the instrumental records of SST
off California substantiated this observation further. It was also noted that
the trends in meridional wind stress obtained from different datasets differ
substantially from each other. Correlation analysis showed that basin-scale oscillations like the
Atlantic Multidecadal Oscillation (AMO) and the Pacific Decadal Oscillation (PDO) could not be
directly linked to the observed increase of upwelling intensity off NW Africa
and California respectively. The relationship of the North Atlantic
Oscillation (NAO) with coastal upwelling off NW Africa turned out to be
ambiguous due to a negative correlation between the NAO index and the
meridional wind stress and a lack of correlation with the SST index. Our
results give additional support to the hypothesis that the coastal upwelling
intensity increases globally because of raising greenhouse gas concentrations
in the atmosphere and an associated increase of the land-sea pressure
gradient and meridional wind stress. |
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