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Deep-dwelling foraminifera as thermocline temperature recorders 5
Cleroux, Caroline; Cortijo, Elsa; Duplessy, Jean-claude; Zahn, Rainer.
We measured the oxygen isotopic composition of the deep-dwelling foraminiferal species G. inflata, G. truncatulinoides dextral and sinistral, and P. obliquiloculata in 29 modern core tops raised from the North Atlantic Ocean. We compared calculated isotopic temperatures with atlas temperatures and defined ecological models for each species. G. inflata and G. truncatulinoides live preferentially at the base of the seasonal thermocline. Under temperature stress, i.e., when the base of the seasonal thermocline is warmer than 16 degrees C, G. inflata and G. truncatulinoides live deeper in the main thermocline. P. obliquiloculata inhabits the seasonal thermocline in warm regions. We tested our model using 10 cores along the Mauritanian upwelling and show that...
Tipo: Text Palavras-chave: Deep-dwelling foraminifera; Depth habitat; Isotopic temperature; Thermocline; North Atlantic; Mauritanian upwelling; Ecological prediction; Stable isotopes; Micropaleontology.
Ano: 2007 URL: https://archimer.ifremer.fr/doc/00236/34727/33178.pdf
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High-resolution sea surface reconstructions off Cape Hatteras over the last 10 ka 5
Cleroux, Caroline; Debret, Maxime; Cortijo, Elsa; Duplessy, Jean-claude; Dewilde, Fabien; Reijmer, John; Massei, Nicolas.
This study presents high-resolution foraminiferal-based sea surface temperature, sea surface salinity and upper water column stratification reconstructions off Cape Hatteras, a region sensitive to atmospheric and thermohaline circulation changes associated with the Gulf Stream. We focus on the last 10,000 years (10 ka) to study the surface hydrology changes under our current climate conditions and discuss the centennial to millennial time scale variability. We observed opposite evolutions between the conditions off Cape Hatteras and those south of Iceland, known today for the North Atlantic Oscillation pattern. We interpret the temperature and salinity changes in both regions as co-variation of activities of the subtropical and subpolar gyres. Around 8.3...
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Ano: 2012 URL: https://archimer.ifremer.fr/doc/00266/37681/36613.pdf
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Mg/Ca and Sr/Ca ratios in planktonic foraminifera: Proxies for upper water column temperature reconstruction 5
Cleroux, Caroline; Cortijo, Elsa; Anand, Pallavi; Labeyrie, Laurent; Bassinot, Franck; Caillon, Nicolas; Duplessy, Jean-claude.
[1] Reliable temperature estimates from both surface and subsurface ocean waters are needed to reconstruct past upper water column temperature gradients and past oceanic heat content. This work examines the relationships between trace element ratios in fossil shells and seawater temperature for surface-dwelling foraminifera species, Globigerinoides ruber (white) and Globigerina bulloides, and deep-dwelling species, Globorotalia inflata, Globorotalia truncatulinoides (dextral and sinistral) and Pulleniatina obliquiloculata. Mg/Ca and Sr/Ca ratios in shells picked in 29 modern core tops from the North Atlantic Ocean are calibrated using calculated isotopic temperatures. Mg/Ca ratios on G. ruber and G. bulloides agree with published data and relationships....
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Ano: 2008 URL: https://archimer.ifremer.fr/doc/00237/34806/33325.pdf
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What caused G. truncatulinoides to calcify in shallower water during the early Holocene in the western Atlantic/Gulf of Mexico? 5
Cleroux, Caroline; Lynch-stieglitz, Jean.
In a recent paper we reconstructed the calcification depth of G. truncatulinoides since the last deglaciation in the Florida Straits. We highlighted a significantly different calcification depth between 8-10 ka and the late Holocene. This migration was found in three different cores over the western North Atlantic American continental margin. This paper presents new Mg/Ca ratio data on G. truncatulinoides in the Florida Strait and new stable isotopic measurements on G. crassaformis in the Gulf of Mexico. Preliminary interpretation to understand the cause of G. truncatulinoides migration in the water column at the beginning of the Holocene is given.
Tipo: Text
Ano: 2010 URL: https://archimer.ifremer.fr/doc/00496/60752/65139.pdf
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