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| Titel |
Role of non-linear dynamics on the ventilation of the oxygen minimum zone in the eastern tropical South Pacific |
| VerfasserIn |
Yonss José, Andreas Oschlies |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250112517
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| Publikation (Nr.) |
 EGU/EGU2015-12676.pdf |
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| Zusammenfassung |
| We analysed the role of non-linear dynamics on the ventilation of the oxygen minimum zone
(OMZ) of the eastren tropical south Pacific (ETSP) by using a coupled physical-biogeochimical
model. The main result showed that non-linear dynamics increases ventilation of the ETSP
from the Equatorial Current System and the Peru Coastal Current (PCC). Around the Equator,
the non-linear dynamics intensified the Equatorial Under-Current (EUC), increasing the
eastward transport of oxygen-rich waters. This induced a shallowing of the oxygen minimum
and a reduction of the OMZ thickness. By intensifying the northward transport of PCC and
narrowing the Peru-Chie UnderCurrent (PCUC), the non-linear dynamics increased the
northward transport of well ventilated waters from the southern origin. Further, the
non-linear dynamics inhibited the northward extension of the low oxygen waters, by
intensifying the southward transport of the PCUC. The reduction of outgoing flow of low
oxygen waters caused a vertical expansion of the OMZ south of 6°S. These results
emphasize the important role played by non-linear dynamics on the ventilation of the
OMZ. |
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