Stable isotope ratios of planktonic foraminifera from North Atlantic surface sediments

DOI

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 d18O 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.

Supplement to: Cléroux, Caroline; Cortijo, Elsa; Duplessy, Jean-Claude; Zahn, Rainer (2007): Deep-dwelling foraminifera as thermocline temperature recorders. Geochemistry, Geophysics, Geosystems, 8(4), Q04N11

Identifier
DOI https://doi.org/10.1594/PANGAEA.832181
Related Identifier IsSupplementTo https://doi.org/10.1029/2006GC001474
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.832181
Provenance
Creator Cléroux, Caroline; Cortijo, Elsa; Duplessy, Jean-Claude; Zahn, Rainer
Publisher PANGAEA
Publication Year 2007
Rights Creative Commons Attribution 3.0 Unported; https://creativecommons.org/licenses/by/3.0/
OpenAccess true
Representation
Resource Type Supplementary Dataset; Dataset
Format text/tab-separated-values
Size 2051 data points
Discipline Earth System Research
Spatial Coverage (-92.566W, 17.430S, -8.534E, 66.600N); Atlantic; La Salle Basin; Blake Plateau, Atlantic Ocean; Meriadzec; Barra fan; Iceland; Gibbs fracture; Namoc; Porto Seamount; Cape Hateras; North Atlantic Ocean
Temporal Coverage Begin 1977-11-17T00:00:00Z
Temporal Coverage End 2003-05-31T23:30:00Z