Late Quaternary 13 C gradients and carbonate accumulation in the western equatorial Atlantic

Details Late Quaternary 13 C gradients and carbonate accumulation in the western equatorial Atlantic Late Quaternary 13 C gradients and carbonate accumulation in the western equatorial Atlantic

Feb 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998e%26psl.155..237m&link_type=abstract

Earth and Planetary Science Letters, vol. 155, Issue 3-4, pp.237-249

Computer Science

4

C-13/C-12, Equatorial Atlantic, Foraminifera, Globorotalia Truncatulinoides, Globigerinoides Sacculifer, Productivity

Scientific paper

We investigated glacial-interglacial changes in vertical 13 C gradients in the western equatorial Atlantic using the carbon isotopic composition of planktonic and benthonic foraminifera. Core top measurements show that the 13 C difference between shallow-dwelling G. sacculifer and thermocline-dwelling G. truncatulinoides is an indicator of the vertical nutrient gradient in the upper water column. In the western equatorial Atlantic, the 13 C differences between G. sacculifer and G. truncatulinoides are reduced during glacials and cold substages of interglacials, while the 13 C differences between G. truncatulinoides and the benthonic species C. wuellerstorfi are increased. This indicates that nutrients were depleted in the thermocline and enriched in deep waters during cold substages. Covariance between the 13 C records of G. truncatulinoides from the western equatorial Atlantic and C. wuellerstorfi from Caribbean intermediate water suggests that the upper part of the western equatorial Atlantic water column was largely composed of nutrient-poor central and intermediate waters of northern origin. This pattern might have been the result of a circulation mode in which subantarctic surface waters formed nutrient-rich deep waters rather than intermediate waters. Lower 230 Th-normalized carbonate accumulation rates during cold substages imply that the decreased nutrient content of subsurface waters induced a lower primary productivity in the western equatorial Atlantic.

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