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dc.contributor.authorSaraswat, R.
dc.contributor.authorKhare, N.
dc.date.accessioned2010-07-30T09:35:53Z
dc.date.available2010-07-30T09:35:53Z
dc.date.issued2010
dc.identifier.citationJournal of Foraminiferal Research, vol.40(3); 220-230
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/3677
dc.description.abstractThe water depth at which the planktic foraminiferal species Globigerina bulloides calcifies its shell has been deciphered based on the oxygen isotopic composition of its shells in surface sediment samples collected from the southwestern Indian Ocean. The seawater temperature for water depths ranging from 0-200 m was estimated from G. bulloides delta sup(18)O by using various paleotemperature equations. Out of several paleotemperature equations, the one given by Epstein and others (1953) provided the best-fit results. Similarly, the estimated seawater salinity was calculated using the seawater delta sup(18)O calculated from G. bulloides delta sup(18)O, and measured seawater temperature taken from the Levitus database. A comparison of seawater salinity and temperature estimated from G. bulloides d delta sup(18)O, with the measured seawater salinity and temperature at different water depths, shows that the calcification depth of G. bulloides varies latitudinally. From the equator to approx. 15 degrees S, the calcification depth of G. bulloides was inferred to be approx. 75 m. Between 15 degrees S and approx. 43 degrees S, the estimated seawater temperature matched well with the seawater temperature at approx. 200 m water depth, indicating that the G. bulloides calcification depth was comparatively deeper in this region. Farther south of approx. 43 degrees S, however, the calcification depth appears to be considerably shallower than in the northern part of the study area. The comparison also showed that irrespective of latitudinal region, the estimated seawater temperature matches well with the seawater temperature during the austral spring season suggesting that G. bulloides is abundant at that time. The findings will help in paleoclimatic reconstruction studies based on characteristics of G. bulloides
dc.language.isoen
dc.publisherCushman Foundation for Foraminiferal Research
dc.rightsAn edited version of this paper was published by The Cushman Foundation for Foraminiferal Research, Copyright [2010]. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository.
dc.subjectGlobigerina bulloides
dc.subjectplanktic foraminiferal
dc.subjectforaminiferal species
dc.subjectIndian Ocean
dc.titleDeciphering the modern calcification depth of Globigerina bulloides in the southwestern Indian Ocean from its oxygen isotopic composition
dc.typeJournal Article


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