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| Maxson, Charles; Bostock, Helen; Mackintosh, Andrew; Mikaloff‐fletcher, Sara; Mccave, Nick; Neil, Helen. |
| Carbon stable isotopes (δ13C) in modern sea water samples and planktic foraminifera Globigerina bulloides from core top and down core sediments are used to estimate the distribution of δ13C of dissolved inorganic carbon (DIC) in the surface waters of the southwest Pacific in the modern, pre‐industrial (PI) and over the last 25 kyr. The predicted δ13C distribution in the modern (δ13CDIC), PI (δ13CPI) and late Holocene (from planktic foraminifera Globigerina bulloides (temperature corrected ‐ δ13CG.bulloidesTC) from core tops) display a broad peak at the Subtropical Front (STF) and subantarctic surface waters (SASW) due to the combination of high biological productivity and thermodynamic air‐sea gas exchange of CO2 in this region. The estimated δ13CPI values... |
| Tipo: Text |
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| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00488/59919/63103.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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