Deep-dwelling forminifera as thermocline temperature recorders
Cléroux, Caroline (Laboratoire des Sciences du Climat et de l'Environnement)
Cortijo, Elsa (Laboratoire des Sciences du Climat et de l'Environnement)
Duplessy, Jean-Claude (Laboratoire des Sciences du Climat et de l'Environnement)
Zahn, Rainer (Universitat Autònoma de Barcelona. Institut de Ciència i Tecnologia Ambientals)

Date:	2007
Abstract:	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°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 the comparison of δ¹⁸O variations registered by the surficial species G. ruber and G. bulloides and the deep-dwelling species G. inflata evidences significant glacial-interglacial shifts of the Mauritanian upwelling cells.
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Deep-dwelling foraminifera ; Depth habitat ; Isotopic temperature ; Mauritanian upwelling ; North Atlantic ; Thermocline
Published in:	Geochemistry, geophysics, geosystems, Vol. 8, Issue 4 (April 2007) , ISSN 1525-2027

DOI: 10.1029/2006GC001474

19 p, 1.6 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Institut de Ciència i Tecnologia Ambientals (ICTA)
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Articles > Published articles