Late-Quaternary biogenic productivity and organic carbon deposition in the eastern Arabian Sea

Rajesh Agnihotri, M. M. Sarin, B. L.K. Somayajulu, A. J.T. Jull, G. S. Burr

Research output: Contribution to journalArticle

40 Scopus citations

Abstract

Paleoproductivity variations in the eastern Arabian Sea, during the late Quaternary period (∼42 ka BP to present), have been studied using accumulation rates of sedimentary biogenic components: organic carbon (Corg), nitrogen (N), CaCO3, Sr and Ba. Such a multi-proxy approach reveals decreased surface productivity during the last glacial-interglacial transition. The observed change of surface water productivity during the last glacial-interglacial period is in antiphase to those observed in other low- and mid-latitude upwelling areas, however, consistent with some of the upwelling regions like NW Africa and NW Mexico. Sedimentary Corg and N are found to be decoupled from surface productivity trend, with significant enrichments in Corg and N during the Last Glacial Maximum (LGM). This is interpreted in terms of increase in sedimentation rates (by a factor of 3-4) resulting in the better preservation of Corg during the LGM.

Original languageEnglish (US)
Pages (from-to)43-60
Number of pages18
JournalPalaeogeography, Palaeoclimatology, Palaeoecology
Volume197
Issue number1-2
DOIs
StatePublished - Aug 15 2003

Keywords

  • Arabian Sea
  • Last Glacial Maximum (LGM)
  • Organic carbon
  • Sedimentation rate
  • Southwest monsoon
  • Surface productivity

ASJC Scopus subject areas

  • Oceanography
  • Ecology, Evolution, Behavior and Systematics
  • Earth-Surface Processes
  • Palaeontology

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