Planktonic foraminiferal δ¹⁸O values and apparent calcification depths of core-top samples along an east-west transect across the tropical Atlantic/Caribbean

DOI

D18O values of nine tropical-subtropical planktonic foraminiferal species with different preferential habitat depths collected from 62 core-top samples along an east-west transect across the tropical Atlantic/Caribbean were used to test the applicability of interspecific d18O gradients for reconstructions of tropical upper ocean stratification. In general, the d18O difference (Delta d18O) between intermediate- and shallow-dwelling species decreases, and Delta d18O between deep and intermediate dwellers increases with increasing thermocline depth towards the west. The statistical significance of regional differences in Delta d18O highlights Delta d18O between the intermediate dwellers (in particular Globorotalia scitula and Globorotalia tumida) and the shallow dweller Globigerinoides ruber pink, as well as Delta d18O between the deep dwellers Globorotalia crassaformis or Globorotalia truncatulinoides dextral and intermediate dwellers as most sensitive to changes in tropical Atlantic thermocline depth. Based on the observed regional variations in interspecific Delta d18O, we propose a multispecies stratification index "STRAtrop" = (d18Ointermediate - d18Oshallow) / (d18Odeep - d18Oshallow) for the tropical ocean. Statistically significant differences in STRAtrop values between the E-Atlantic and the Caribbean suggest that this index may be a useful tool to monitor variations in tropical upper ocean stratification in the geological record.

Supplement to: Steph, Silke; Regenberg, Marcus; Tiedemann, Ralf; Mulitza, Stefan; Nürnberg, Dirk (2009): Stable isotopes of planktonic foraminifera from tropical Atlantic/Caribbean core-tops: Implications for reconstructing upper ocean stratification. Marine Micropaleontology, 71(1-2), 1-19

Identifier
DOI https://doi.org/10.1594/PANGAEA.742421
Related Identifier IsSupplementTo https://doi.org/10.1016/j.marmicro.2008.12.004
Related Identifier References https://doi.org/10.58031/KIEL0089GEMT101
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.742421
Provenance
Creator Steph, Silke; Regenberg, Marcus; Tiedemann, Ralf ORCID logo; Mulitza, Stefan ORCID logo; Nürnberg, Dirk
Publisher PANGAEA
Publication Year 2009
Rights Creative Commons Attribution 3.0 Unported; https://creativecommons.org/licenses/by/3.0/
OpenAccess true
Representation
Resource Type Supplementary Publication Series of Datasets; Collection
Format application/zip
Size 10 datasets
Discipline Earth System Research
Spatial Coverage (-79.422W, -5.842S, -8.650E, 21.324N); Equatorial Atlantic; Guinea Basin; Brazil Basin; Amazon Fan; Midatlantic Ridge; Columbia Basin; Beata Ridge; Bahamas; Venezuela Basin; Aves Ridge; Martinique; Guadeloupe
Temporal Coverage Begin 1989-02-25T00:00:00Z
Temporal Coverage End 2002-06-16T11:50:00Z