Early deglacial (∼19-17 ka) strengthening of the northeast monsoon

Manish Tiwari; R. Ramesh; B. L.K. Somayajulu; A. J.T. Jull; G. S. Burr

doi:10.1029/2005GL024070

Early deglacial (∼19-17 ka) strengthening of the northeast monsoon

Manish Tiwari, R. Ramesh, B. L.K. Somayajulu, A. J.T. Jull, G. S. Burr

Geosciences

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48 Scopus citations

Abstract

Earlier studies that mostly relied on bulk ¹⁴C dating indicated a weaker Southwest monsoon (SWM) and a stronger than present Northeast monsoon (NEM) during the Last Glacial Maximum (LGM, ∼18000 ¹⁴C years or ∼21000 calendar years ago). We have analyzed a sediment core from the equatorial Indian Ocean, where planktonic foraminifera were dated by Accelerator Mass Spectrometry (AMS ¹⁴C). δ¹⁸O analysis of three species of foraminifera viz. Globigerinoides ruber, Globigerinoides sacculifer, and Globorotalia menardii reveals that the NEM strengthened during the early deglacial period (∼15000 ¹⁴C years ago or ∼18000 calendar years ago) relative to the present and not during the LGM as surmised earlier.

Original language	English (US)
Article number	L19712
Pages (from-to)	1-4
Number of pages	4
Journal	Geophysical Research Letters
Volume	32
Issue number	19
DOIs	https://doi.org/10.1029/2005GL024070
State	Published - Oct 16 2005

ASJC Scopus subject areas

Geophysics
General Earth and Planetary Sciences

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title = "Early deglacial (∼19-17 ka) strengthening of the northeast monsoon",

abstract = "Earlier studies that mostly relied on bulk 14C dating indicated a weaker Southwest monsoon (SWM) and a stronger than present Northeast monsoon (NEM) during the Last Glacial Maximum (LGM, ∼18000 14C years or ∼21000 calendar years ago). We have analyzed a sediment core from the equatorial Indian Ocean, where planktonic foraminifera were dated by Accelerator Mass Spectrometry (AMS 14C). δ18O analysis of three species of foraminifera viz. Globigerinoides ruber, Globigerinoides sacculifer, and Globorotalia menardii reveals that the NEM strengthened during the early deglacial period (∼15000 14C years ago or ∼18000 calendar years ago) relative to the present and not during the LGM as surmised earlier.",

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AU - Tiwari, Manish

AU - Ramesh, R.

AU - Somayajulu, B. L.K.

AU - Jull, A. J.T.

AU - Burr, G. S.

PY - 2005/10/16

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AB - Earlier studies that mostly relied on bulk 14C dating indicated a weaker Southwest monsoon (SWM) and a stronger than present Northeast monsoon (NEM) during the Last Glacial Maximum (LGM, ∼18000 14C years or ∼21000 calendar years ago). We have analyzed a sediment core from the equatorial Indian Ocean, where planktonic foraminifera were dated by Accelerator Mass Spectrometry (AMS 14C). δ18O analysis of three species of foraminifera viz. Globigerinoides ruber, Globigerinoides sacculifer, and Globorotalia menardii reveals that the NEM strengthened during the early deglacial period (∼15000 14C years ago or ∼18000 calendar years ago) relative to the present and not during the LGM as surmised earlier.

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Early deglacial (∼19-17 ka) strengthening of the northeast monsoon

Abstract

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