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| Titel |
Decadal variability and trends of the Benguela upwelling system as simulated in a high-resolution ocean simulation |
| VerfasserIn |
N. Tim, E. Zorita, B. Hünicke |
| 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 ; 11, no. 3 ; Nr. 11, no. 3 (2015-06-30), S.483-502 |
| Datensatznummer |
250117230
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| Publikation (Nr.) |
 copernicus.org/os-11-483-2015.pdf |
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| Zusammenfassung |
| Detecting the atmospheric drivers of the Benguela upwelling systems is
essential to understand its present variability and its past and future
changes. We present a statistical analysis of a high-resolution
(0.1°) ocean-only simulation driven by observed atmospheric fields
over the last 60 years with the aim of identifying the large-scale
atmospheric drivers of upwelling variability and trends. The simulation is
found to reproduce well the seasonal cycle of upwelling intensity, with a
maximum in the June–August season in North Benguela and in the
December–February season in South Benguela. The statistical analysis of
the interannual variability of upwelling focuses on its relationship to
atmospheric variables (sea level pressure, 10 m wind, wind stress).
The relationship between upwelling and the atmospheric variables differ
somewhat in the two regions, but generally the correlation patterns reflect
the common atmospheric pattern favouring upwelling: southerly wind/wind
stress, strong subtropical anticyclone, and an ocean–land sea level pressure
gradient. In addition, the statistical link between upwelling and large-scale
climate variability modes was analysed. The El Niño–Southern Oscillation
and the Antarctic Oscillation exert some influence on austral summer
upwelling velocities in South Benguela. The decadal evolution and the
long-term trends of simulated upwelling and of ocean-minus-land air pressure
gradient do not agree with Bakun's hypothesis that anthropogenic climate
change should generally intensify coastal upwelling. |
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