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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/21877
Title: Inconsistent change in surface hydrography of the eastern Arabian Sea during the last four glacial-interglacial intervals
Authors: Saraswat R.
Kurtarkar S.R.
Yadav R.
Mackensen A.
Singh, Dharmendra Pratap
Bhadra S.
Singh A.D.
Tiwari M.
Prabhukeluskar S.P.
Bandodkar S.R.
Pandey D.K.
Clift P.D.
Kulhanek D.K.
Bhishekar K.
Nair S.
Published in: Geological Magazine
Abstract: The eastern Arabian Sea is influenced by both the advection of upwelled water from the western Arabian Sea and winter convective mixing. Therefore, sediments collected from the eastern Arabian Sea can help to understand the long-term seasonal hydrographic changes. We used the planktonic foraminifera census and stable isotopic ratio (δ18O) from sediments drilled during the International Ocean Discovery Program Expedition 355 to reconstruct surface hydrographic changes in the eastern Arabian Sea during the last 350 kyr. The increased abundance of Globigerina bulloides suggests enhanced advection of upwelled water during the latter half of MIS7 and the beginning of MIS6, as a result of a strengthened summer monsoon. A large drop in upwelling and/or advection of upwelled water from the western Arabian Sea is inferred during the subsequent interval of MIS6, based on the rare presence of G. bulloides. The comparable relative abundance of Neogloboquadrina dutertrei, G. bulloides and Globigerinoides ruber suggests that during the early part of MIS5, hydrographic conditions were similar to today. The upwelling decreased and winter convection increased with the progress of the glacial interval. A good coherence between planktonic foraminiferal assemblage-based monsoon stacks from both the eastern and western Arabian Sea suggests a coeval response of the entire northern Arabian Sea to the glacial-interglacial changes. The glacial-interglacial difference in δ18Osw-ivc was at a maximum with 4-5 psu change in salinity during Termination 2 and 3, and a minimum during Termination 4. The significantly reduced regional contribution to the glacial-interglacial change in δ18Osw-ivc during Termination 4 suggests a lesser change in the monsoon. © Cambridge University Press 2019.
Citation: Geological Magazine: 989-1000
URI: https://doi.org/10.1017/S0016756819001122
http://repository.iitr.ac.in/handle/123456789/21877
Issue Date: 2020
Publisher: Cambridge University Press
Keywords: Arabian Sea
census
foraminifera
hydrography
planktonic
Quaternary
δ18O
ISSN: 167568
Author Scopus IDs: 9249722600
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57196195935
7407707038
9535425800
57218863476
57218862603
57217627320
7004449923
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57218862497
7402726305
Author Affiliations: Saraswat, R., Micropaleontology Laboratory, Geological Oceanography Division, National Institute of Oceanography, Goa, India
Kurtarkar, S.R., Micropaleontology Laboratory, Geological Oceanography Division, National Institute of Oceanography, Goa, India
Yadav, R., Micropaleontology Laboratory, Geological Oceanography Division, National Institute of Oceanography, Goa, India
Mackensen, A., Alfred Wegner Institute for Polar and Marine Science, Bremerhaven, Germany
Singh, D.P., Micropaleontology Laboratory, Geological Oceanography Division, National Institute of Oceanography, Goa, India
Bhadra, S., Micropaleontology Laboratory, Geological Oceanography Division, National Institute of Oceanography, Goa, India
Singh, A.D., Banaras Hindu University, Varanasi, India
Tiwari, M., National Centre for Polar and Ocean Research, Goa, India
Prabhukeluskar, S.P., Micropaleontology Laboratory, Geological Oceanography Division, National Institute of Oceanography, Goa, India
Bandodkar, S.R., Micropaleontology Laboratory, Geological Oceanography Division, National Institute of Oceanography, Goa, India
Pandey, D.K., National Centre for Polar and Ocean Research, Goa, India
Clift, P.D., Department of Geology and Geophysics, Louisiana State University, E253 Howe-Russell-Kniffen Geoscience Complex, Baton Rouge, LA 70803, United States
Kulhanek, D.K., International Ocean Discovery Program, Texas AandM University, College Station, United States
Bhishekar, K., Micropaleontology Laboratory, Geological Oceanography Division, National Institute of Oceanography, Goa, India
Nair, S., Micropaleontology Laboratory, Geological Oceanography Division, National Institute of Oceanography, Goa, India
Corresponding Author: Saraswat, R.; Micropaleontology Laboratory, India; email: rsaraswat@nio.org
Appears in Collections:Journal Publications [ES]

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