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| Titel |
Multiparametric analysis of water masses across Drake Passage during austral summer 2006 |
| VerfasserIn |
J. Sudre, V. Garçon, N. Sennechael, C. Provost, O. Huhn |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250025459
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| Zusammenfassung |
| A multiparametric analysis is applied on the ANT XXIII-3 expedition data to determine the
spreading and mixing of water masses across Drake Passage during January-February 2006,
focusing our interest on the flow of the deep water masses. The method utilizes all
information from the hydrographical data set including temperature, salinity, dissolved
oxygen, nutrients, and3He fields. Mixing proportions are quantified along both the southward
and northward journeys between the tip of South America and the Antarctic Peninsula. The
method is sensitive enough to detect a marked variability of the flow pathway of the
Circumpolar Deep Waters, the Southeast Pacific Deep Waters and the Weddell Sea Deep
Waters at the intersection of the Shackleton Fracture Zone (SFZ) and the West Scotia Ridge
(WSR) between the outward and inward journeys. Indeed seamounts of the SFZ and off the
southern flank of the WSR probably induce a strong sporadic perturbation in the flow field
preventing a normal vertical stacking of water masses as it was the case during the
outward journey. An enhanced δ3He signature is confined to north of the Polar Front
between 55.5Ë S and 56.5Ë S in the 1500-2200 m depth range. It clearly indicates the
signature of the core of the Southeast Pacific Deep Slope Waters. This high δ3He
signal was observed very close to the South American slope during the WOCE A21
expedition in 1990. During the ANT XXIII-3 expedition, the SPDSW followed an entry
pathway in the ACC more detached from the continental slope of South America. |
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