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Stalagmite Based High Resolution ?18O Record of Indian Summer Monsoon Activity in Lesser Himalaya during the late Holocene | OMICS International | Abstract
ISSN: 2157-7617

Journal of Earth Science & Climatic Change
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Stalagmite Based High Resolution ?18O Record of Indian Summer Monsoon Activity in Lesser Himalaya during the late Holocene

Waseem Raza1, Syed Masood Ahmad2*, Mahjoor Ahmad Lone3, Drona Srinivasa Sarma1, EVSSK Babu1 and Chuan-Chou Shen3
1CSIR-National Geophysical Research Institute, Hyderabad, India
2Department of Geography, Jamia Millia Islamia, New Delhi, India
3Department of Geosciences, National Taiwan University, Taipei 10617, Taiwan
*Corresponding Author: Syed Masood Ahmad, Department of Geography, Jamia Millia Islamia, New Delhi, India, Email: [email protected]

Received Date: Oct 30, 2019 / Accepted Date: Jan 23, 2020 / Published Date: Feb 01, 2020

Citation: Raza W, Ahmad SM, Lone MA, Sarma DS, Babu EVSSK, et al. (2020) Stalagmite Based High Resolution δ18O Record of Indian Summer Monsoon Activity in Lesser Himalaya during the late Holocene. J Earth Sci Clim Change 11:527

Copyright: © 2020 Raza W, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

 
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Abstract

The oxygen isotopic (δ18O) records from speleothems, particularly stalagmites, provide very valuable information to reconstruct paleomonsoon history. Here we present a high-resolution record of Indian summer monsoon (ISM) precipitation for the 2,851 and 677 year BP using a U-Th dated stalagmite sample from lesser Himalayan cave. The stalagmite (BGR1) may have been developed under the isotopic equilibrium condition as revealed by its almost identical δ18O values of selected growth layers (Hendy test). X-ray diffraction analysis of BGR1 stalagmite shows predominance of calcite mineral. The δ18O values exhibit significant changes (ranging from -6.92 to -10.24‰ vs. VPDB) during the studied time interval. Based on our δ18O record, the climatic activity in lesser Himalaya can be categorized in two distinct phases, (a) a relatively dry period from 2,851 to 1,031 year BP and (b) a moderately wet period between 1,031 and 677 year BP. The spectral analysis of δ18O time series reveals a range of significant periodic components reflecting the control of solar activity on ISM variability.

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