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

doi:10.1016/S0031-0182(03)00385-7

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

Geosciences

Research output: Contribution to journal › Article › peer-review

69 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 (C_org), 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 C_org and N are found to be decoupled from surface productivity trend, with significant enrichments in C_org 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 C_org during the LGM.

Original language	English (US)
Pages (from-to)	43-60
Number of pages	18
Journal	Palaeogeography, Palaeoclimatology, Palaeoecology
Volume	197
Issue number	1-2
DOIs	https://doi.org/10.1016/S0031-0182(03)00385-7
State	Published - 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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10.1016/S0031-0182(03)00385-7

Cite this

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title = "Late-Quaternary biogenic productivity and organic carbon deposition in the eastern Arabian Sea",

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.",

keywords = "Arabian Sea, Last Glacial Maximum (LGM), Organic carbon, Sedimentation rate, Southwest monsoon, Surface productivity",

author = "Rajesh Agnihotri and Sarin, {M. M.} and Somayajulu, {B. L.K.} and Jull, {A. J.T.} and Burr, {G. S.}",

note = "Funding Information: This work was partly supported by JGOFS/DOD (Indian program of Department of Ocean Development) and ISRO/GBP of the Department of Space. We thank Mr. V. Ravindranathan, Director CMLRE, Captain and Crew of FORV Sagar Sampada (DOD) for their help. We also thank Prof. S. Krishnaswami for fruitful discussions during the course of the study. B.L.K.S. was a CSIR Emeritus Scientist during this period. We thank Dr. A. Sarkar for his analytical help with hand-picked planktonic foraminifera species. The critical comments provided by anonymous reviewers were of immense help in improving the manuscript. ",

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doi = "10.1016/S0031-0182(03)00385-7",

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pages = "43--60",

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T1 - Late-Quaternary biogenic productivity and organic carbon deposition in the eastern Arabian Sea

AU - Agnihotri, Rajesh

AU - Sarin, M. M.

AU - Somayajulu, B. L.K.

AU - Jull, A. J.T.

AU - Burr, G. S.

N1 - Funding Information: This work was partly supported by JGOFS/DOD (Indian program of Department of Ocean Development) and ISRO/GBP of the Department of Space. We thank Mr. V. Ravindranathan, Director CMLRE, Captain and Crew of FORV Sagar Sampada (DOD) for their help. We also thank Prof. S. Krishnaswami for fruitful discussions during the course of the study. B.L.K.S. was a CSIR Emeritus Scientist during this period. We thank Dr. A. Sarkar for his analytical help with hand-picked planktonic foraminifera species. The critical comments provided by anonymous reviewers were of immense help in improving the manuscript.

PY - 2003/8/15

Y1 - 2003/8/15

N2 - 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.

AB - 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.

KW - Arabian Sea

KW - Last Glacial Maximum (LGM)

KW - Organic carbon

KW - Sedimentation rate

KW - Southwest monsoon

KW - Surface productivity

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JO - Palaeogeography, Palaeoclimatology, Palaeoecology

JF - Palaeogeography, Palaeoclimatology, Palaeoecology

IS - 1-2

ER -

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

Abstract

Keywords

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