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| Lankhorst, Matthias; Fratantoni, David; Ollitrault, Michel; Richardson, Philip; Send, Uwe; Zenk, Walter. |
| A comprehensive analysis of velocity data from subsurface floats in the northwestern tropical Atlantic at two depth layers is presented: one representing the Antarctic Intermediate Water (AAIW, pressure range 600-1050dbar), the other the upper North Atlantic Deep Water (uNADW, pressure range 1200-2050dbar). New data from three independent research programs are combined with previously available data to achieve blanket coverage in space for the AAIW layer, while coverage in the uNADW remains more intermittent. Results from the AAIW` mainly confirm previous studies on the mean flow, namely the equatorial zonal and the boundary currents, but clarify details on pathways, mostly by virtue of the spatial data coverage that sets float observations apart from e.g.... |
| Tipo: Text |
Palavras-chave: Equatorial currents; North Atlantic Deep Water; Antarctic Intermediate Water; Tropical Atlantic; Floats. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-6815.pdf |
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| Durand, Axel; Chase, Zanna; Noble, Taryn L.; Bostock, Helen; Jaccard, Samuel L.; Townsend, Ashley T.; Bindoff, Nathaniel L.; Neil, Helen; Jacobsen, Geraldine. |
| To investigate changes in oxygenation at intermediate depths in the southwest Pacific between the Last Glacial Maximum (LGM) and the Holocene, redox sensitive elements uranium and rhenium were measured in 12 sediment cores located on the Campbell and Challenger plateaux offshore from New Zealand. The core sites are currently bathed by Subantarctic Mode Water (SAMW), Antarctic Intermediate Water (AAIW) and Upper Circumpolar Deep Water (UCDW). The sedimentary distributions of authigenic uranium and rhenium reveal reduced oxygen content at intermediate depths (800-1500 m) during the LGM compared to the Holocene. In contrast, data from deeper waters (>= 1500 m) indicate higher oxygen content during the LGM compared to the Holocene. These data, together with... |
| Tipo: Text |
Palavras-chave: Oceanic deoxygenation; Redox sensitive elements; Ventilation; Antarctic Intermediate Water; New Zealand; Circulation changes. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00495/60703/83612.pdf |
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