The coupling of Orbulina universa diameter with the warming and cooling events in the Arabian Sea over the past 40,000 years

P. M. Nimmy; N. Rajeshwara Rao; K. Neelavannan; S. M. Hussain; S. R. Mahapatra

doi:10.18520/cs/v120/i4/694-698

The coupling of Orbulina universa diameter with the warming and cooling events in the Arabian Sea over the past 40,000 years

P. M. Nimmy^*
, N. Rajeshwara Rao
, K. Neelavannan
, S. M. Hussain
, S. R. Mahapatra

^*Corresponding author for this work

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

3 Scopus citations

Abstract

A 40 ky record of variations in the average diameter of Orbulina universa from a 5.4 m core (SK-322) in the Arabian Sea, off Goa, India has been analysed in this study. The chronology of the upper 1.00 m of the core was documented by AMS radiocarbon dates. Fifty specimens of O. universa were hand-picked from each of the 50 subsamples. In all, 2500 specimens were measured for their diameter. Downcore variations in the average diameter of O. universa were in excellent agreement with the curve representing the Iberian Margin temperature index, with the peak representing the Bolling-Allerod transition and the troughs reflecting Heinrich Event I and Younger Dryas. The lower part of the core examined in this study (between 58 and 100 cm), which is the equivalent of 30,000-40,000 years BP, is marked by closely spaced peaks and troughs that are interpreted as representing the Dans- gaard-Oeschger cycles that were dominant in the Northern Hemisphere between 60,000 and 30,000 years BP.

Original language	English
Pages (from-to)	694-698
Number of pages	5
Journal	Current Science
Volume	120
Issue number	4
DOIs	https://doi.org/10.18520/cs/v120/i4/694-698
State	Published - 25 Feb 2021

Bibliographical note

Funding Information:
ACKNOWLEDGEMENTS. P.M.N. thanks the Department of Science and Technology, Government of India for financial support (DST/INSPIRE Fellowship/2013; IF 140848). K.N. thanks the Director, National Center for Polar and Ocean Research (NCPOR), Goa, and Dr P. John Kurien (NCPOR) and Dr Abhishek Tyagi (NCPOR) for giving the opportunity to participate in the oceanographic cruise program to collect the sediment core samples. We thank the authorities of the University of Madras, Chennai for providing the necessary facilities to carry out this work.

Publisher Copyright:
© 2021. All rights reserved.

Keywords

Average diameter
Orbulina universa
Palaeoclimate
planktic foraminifera

ASJC Scopus subject areas

General

Access to Document

10.18520/cs/v120/i4/694-698

Cite this

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title = "The coupling of Orbulina universa diameter with the warming and cooling events in the Arabian Sea over the past 40,000 years",

abstract = "A 40 ky record of variations in the average diameter of Orbulina universa from a 5.4 m core (SK-322) in the Arabian Sea, off Goa, India has been analysed in this study. The chronology of the upper 1.00 m of the core was documented by AMS radiocarbon dates. Fifty specimens of O. universa were hand-picked from each of the 50 subsamples. In all, 2500 specimens were measured for their diameter. Downcore variations in the average diameter of O. universa were in excellent agreement with the curve representing the Iberian Margin temperature index, with the peak representing the Bolling-Allerod transition and the troughs reflecting Heinrich Event I and Younger Dryas. The lower part of the core examined in this study (between 58 and 100 cm), which is the equivalent of 30,000-40,000 years BP, is marked by closely spaced peaks and troughs that are interpreted as representing the Dans- gaard-Oeschger cycles that were dominant in the Northern Hemisphere between 60,000 and 30,000 years BP.",

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note = "Funding Information: ACKNOWLEDGEMENTS. P.M.N. thanks the Department of Science and Technology, Government of India for financial support (DST/INSPIRE Fellowship/2013; IF 140848). K.N. thanks the Director, National Center for Polar and Ocean Research (NCPOR), Goa, and Dr P. John Kurien (NCPOR) and Dr Abhishek Tyagi (NCPOR) for giving the opportunity to participate in the oceanographic cruise program to collect the sediment core samples. We thank the authorities of the University of Madras, Chennai for providing the necessary facilities to carry out this work. Publisher Copyright: {\textcopyright} 2021. All rights reserved.",

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AU - Hussain, S. M.

AU - Mahapatra, S. R.

N1 - Funding Information: ACKNOWLEDGEMENTS. P.M.N. thanks the Department of Science and Technology, Government of India for financial support (DST/INSPIRE Fellowship/2013; IF 140848). K.N. thanks the Director, National Center for Polar and Ocean Research (NCPOR), Goa, and Dr P. John Kurien (NCPOR) and Dr Abhishek Tyagi (NCPOR) for giving the opportunity to participate in the oceanographic cruise program to collect the sediment core samples. We thank the authorities of the University of Madras, Chennai for providing the necessary facilities to carry out this work. Publisher Copyright: © 2021. All rights reserved.

PY - 2021/2/25

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N2 - A 40 ky record of variations in the average diameter of Orbulina universa from a 5.4 m core (SK-322) in the Arabian Sea, off Goa, India has been analysed in this study. The chronology of the upper 1.00 m of the core was documented by AMS radiocarbon dates. Fifty specimens of O. universa were hand-picked from each of the 50 subsamples. In all, 2500 specimens were measured for their diameter. Downcore variations in the average diameter of O. universa were in excellent agreement with the curve representing the Iberian Margin temperature index, with the peak representing the Bolling-Allerod transition and the troughs reflecting Heinrich Event I and Younger Dryas. The lower part of the core examined in this study (between 58 and 100 cm), which is the equivalent of 30,000-40,000 years BP, is marked by closely spaced peaks and troughs that are interpreted as representing the Dans- gaard-Oeschger cycles that were dominant in the Northern Hemisphere between 60,000 and 30,000 years BP.

AB - A 40 ky record of variations in the average diameter of Orbulina universa from a 5.4 m core (SK-322) in the Arabian Sea, off Goa, India has been analysed in this study. The chronology of the upper 1.00 m of the core was documented by AMS radiocarbon dates. Fifty specimens of O. universa were hand-picked from each of the 50 subsamples. In all, 2500 specimens were measured for their diameter. Downcore variations in the average diameter of O. universa were in excellent agreement with the curve representing the Iberian Margin temperature index, with the peak representing the Bolling-Allerod transition and the troughs reflecting Heinrich Event I and Younger Dryas. The lower part of the core examined in this study (between 58 and 100 cm), which is the equivalent of 30,000-40,000 years BP, is marked by closely spaced peaks and troughs that are interpreted as representing the Dans- gaard-Oeschger cycles that were dominant in the Northern Hemisphere between 60,000 and 30,000 years BP.

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KW - Palaeoclimate

KW - planktic foraminifera

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JO - Current Science

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ER -

The coupling of Orbulina universa diameter with the warming and cooling events in the Arabian Sea over the past 40,000 years

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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