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Single foraminifera Mg/Ca analyses of past glacial-interglacial temperatures derived from G. ruber sensu stricto and sensu lato morphotypes ArchiMer
Schmitt, A.; Elliot, M.; Thirumalai, K.; La, C.; Bassinot, F.; Petersen, J.; Movellan, A.; Jorry, Stephan; Borgomano, J..
The ratio of magnesium to calcium (Mg/Ca) in foraminiferal shells is commonly used as a proxy for past ocean temperature. Recent advances in elemental analyses now enable single-specimen measurements of planktic foraminifera and thus, can provide information on past seasonal and interannual variability, owing to the near-monthly lifespan of foraminifera. In this study, we explore the temperature variance recorded by Mg/Ca in tests of foraminifera Globigerinoides ruber, a planktic species that occurs throughout the year in tropical waters. Using LA-ICP-MS, we characterize Mg/Ca variability in single specimens of two morphotypes of G. ruber picked from a sediment core retrieved offshore New Caledonia. We provide an estimate of the range of calcification...
Tipo: Text Palavras-chave: Globigerinoides ruber; Mg/Ca ratio; Sea surface temperature; LA-ICPMS; Seasonality; Quaternary.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00472/58336/60890.pdf
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The role of the Sunda Strait in the glacial to Holocene development of the eastern tropical Indian Ocean hydrography ArchiMer
Setiawan, Riza Yuliratno.
The eastern tropical Indian Ocean (ETIO) off southern Indonesia is a very important region for the global thermohaline circulation as it hosts the exit pathway of the Indonesian Throughflow (ITF). From this region cool and fresh ITF waters are advected by the South Equatorial Current (SEC) to the Indian Ocean. Consequently, the ITF water freshens the Indian Ocean. Nevertheless, the hydrology condition was different during the Last Glacial Maximum (LGM). During this period the sea level was low and the Sunda Shelf was an exposed land. Marine records and simulation study suggest that the exposure of the Sunda Shelf caused a significant reduction in convection over the Indonesian region, resulting arid condition and saltier sea surface condition off south...
Tipo: Text Palavras-chave: Eastern tropical Indian Ocean; Sunda Strait; Mg/Ca ratio; Sunda shelf.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00495/60662/64159.pdf
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