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  Holocene environmental magnetic records of Indian monsoon fluctuations

Basavaiah, N., Seetharamaiah, J., Appel, E., Juyal, N., Prasad, S., Rao, K. N., Khadkikar, A., Nowaczyk, N., Brauer, A. (2022): Holocene environmental magnetic records of Indian monsoon fluctuations. - In: Kumaran, N., Damodara, P. (Eds.), Holocene Climate Change and Environment, Amsterdam : Elsevier, 229-247.
https://doi.org/10.1016/B978-0-323-90085-0.00004-8

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 Creators:
Basavaiah, N.1, Author
Seetharamaiah, J.1, Author
Appel, Erwin1, Author
Juyal, Navin1, Author
Prasad, Sushma1, Author
Rao, K. Nageswara1, Author
Khadkikar, A.S.1, Author
Nowaczyk, N.2, Author              
Brauer, A.2, Author              
Affiliations:
1External Organizations, ou_persistent22              
24.3 Climate Dynamics and Landscape Evolution, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146046              

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Free keywords: Sediment mineral magnetism Magnetic properties Holocene monsoon Stacked S-ratio proxy
 Abstract: Holocene history of the Indian monsoon reconstruction using environmental magnetism has emerged as an effective paleoclimate proxy with its fast, efficient, and repeatable measuring procedures. In this chapter, we have made an attempt to provide a broad synthesis of the available sediment magnetic records obtained from the loess-paleosols (central Himalaya), lake (western India), delta and lagoon sequences (eastern coast Godavari and Iskapalli). Variations in magnetomineralogical S-ratio values of sediment archives were combined and stacked as a surrogate for Holocene paleomonsoon change. High S-ratio results from low weathering rates were attributed to more wet conditions, while low S-ratios were related to dry conditions from intense low temperature oxidation. Combining the S-ratio data from diverse environments collectively revealed three broad climate phases with minor oscillations during the past 20 ka. These are (i) a step-wise intensification of the SW monsoon since the Last Glacial Maximum with its peak level at ∼9.0 ka, (ii) the prevalence of a prolonged dry spell along the eastern coast and western India at ∼3.5 ka that led to the collapse of the Harappan civilization, and (iii) reduction of monsoon rainfall during the period of global cooling events such as Last Glacial Maximum, Younger Dryas, and Little Ice Age. We observed that instead of the concentration-specific magnetic susceptibility (χ), the combined remanence S-ratio seems to be a more sensitive proxy responding to the monsoon variability both at centennial and millennial time scales.

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Language(s):
 Dates: 20212022
 Publication Status: Finally published
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/B978-0-323-90085-0.00004-8
GFZPOF: p4 T2 Ocean and Cryosphere
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Title: Holocene Climate Change and Environment
Source Genre: Book
 Creator(s):
Kumaran, Navnith, Editor
Damodara, Padmalal, Editor
Affiliations:
-
Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 229 - 247 Identifier: ISBN: 978-0-323-90085-0