Sudden warming epochs during 42 to 28 ky BP in the Himalayan region from stable 
isotope record of sediment column from a relict lake in Goting, Garhwal, North 
India

Ghosh, P.; Bhattacharya, S. K.

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Sudden warming epochs during 42 to 28 ky BP in the Himalayan region from stable isotope record of sediment column from a relict lake in Goting, Garhwal, North India

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Ghosh, P.
Service Facility Stable Isotope/Gas Analytics, Dr. W. A. Brand, Max Planck Institute for Biogeochemistry, Max Planck Society;

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http://www.currentscience.ac.in/Downloads/download_pdf.php?titleid=id_085_01_0060_0067_0
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Citation

Ghosh, P., & Bhattacharya, S. K. (2003). Sudden warming epochs during 42 to 28 ky BP in the Himalayan region from stable isotope record of sediment column from a relict lake in Goting, Garhwal, North India. Current Science, 85(1), 60-67.

Cite as: https://hdl.handle.net/11858/00-001M-0000-000E-D04E-E

Abstract

O-18/O-16 variations of the precipitation recorded in carbonate sediments of a high-altitude Himalayan lake have been investigated by analysing samples from a varve deposit in Goting, Garhwal Himalaya. C-14 ages of four samples from different depths suggest that the sedimentation in the lake started similar to 42 ky BP and continued till similar to 28 ky BP. Fluctuations in delta(18)O values are interpreted in terms of water-source variations. A trend showing the enrichment of delta(18)O values between 32 and 28 ka indicates slow cooling as one approaches the Last Glacial Maximum (LGM). There are six strong delta(18)O excursions (depleted ratios) coinciding with low delta(13)C values at around 40.2, 38.2, 36.2, 34.2, 32.8 and 29.4 ky BP, denoting enhancement of the southwest monsoon. In addition, three positive shifts at around 40.7, 37.2 and 35.2 ky BP were observed, which indicate weakening of the southwest monsoon. Fourier analysis of the delta(18)O time series shows a significant similar to 740 year periodicity, similar to that reported in the Arabian Sea and the South China Sea.