Hydrochemical and stable isotopic characteristics of waters in and around an eutrophic lake—Ooty, Tamil Nadu, India

Parthasarathy, P.; Swain, Sujit Kumar; Balu, Gowtham

doi:10.1007/s12517-021-06686-3

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“…The differences in the δD of SWM and NEM at GNIP stations varied from 9‰ to 26‰. The δD of stream water at Ootacamund during July (−32‰) and October (−59‰) (Parthasarathy et al, 2021), gave an estimate of the δD of rainfall during the SWM and NEM, respectively. Isotopic variability in the Nilgiri Plateau.…”

Section: The Isotopic Characteristics Of the Modern-day Rainfallmentioning

confidence: 99%

Holocene precipitation hydrogen isotopic values on Nilgiri Plateau (southern India) suggest a combined effect of precipitation amount and transport paths

et al. 2023

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Paleoclimate investigations of the peat deposits in the Nilgiri Plateau, an important paleoclimate archive of India, are mainly restricted to the carbon isotope composition ((δ13C) of plant-derived materials and pollen studies. However, it is unclear whether these proxies reflect past variability in temperature or hydrology. Here, we report the hydrogen and carbon isotopic variability of n-alkanoic acid of chain length 28 (δDC28 and δ13CC28, respectively) and demonstrate that the peatland leaf wax hydrogen isotopes provide a sensitive record of past hydrology. The decoupling of δ13CC28 and δD of vegetation-corrected rain during the Holocene indicate that δD of the leaf wax compounds mainly respond to past hydrological variability whereas δ13C variations might reflect the temperature-controlled variability of C3 and C4 vegetation. Conforming with the other paleoclimate records from the region, the δDC28 variations showed a reducing precipitation trend since the early Holocene. However, a large amplitude of reconstructed δD of rain (~44‰) during the Holocene indicated changes in the moisture source and trajectory could be an additional factor contributing to the orbital-scale δD variability of proxies from the Indian region.

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Section: The Isotopic Characteristics Of the Modern-day Rainfallmentioning

confidence: 99%