Diffuse reflectance spectroscopy of a tropical southern Indian lake sediment core: A window to environmental change

K. Sandeep, R. Shankar, A. K. Warrier, W. Balsam

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Pookot is a small freshwater lake situated in the Sahyadri (the Western Ghat) of southern India. We used diffuse reflectance spectroscopy (DRS) and magnetic parameters to characterize the sediment components present in a core dating back to ~3000 cal. years B.P. DRS data indicate the presence of CaCO3, goethite, hematite/goethite, clay minerals and organic carbon in the lake sediments. Based on the down-core variations of the four components, and the values of xlf (low-field magnetic susceptibility indicative of detrital magnetite) and DRS parameter redness %, we reconstructed the paleoenvironmental history of the region surrounding the lake. The down-core variations of DRS-determined sediment composition and of data obtained from independent analyses (CaCO3, S-ratio, clay % and Corg %) are similar. The pre-2500 cal. years B.P. period was characterized by a stronger monsoon compared to the Present. From 2500-1000 cal. years B.P., the monsoon was weak and steady, but interspersed with brief periods of strong monsoon, whereas from 1000 cal. years B.P. to the Present, rainfall exhibited a fluctuating trend. Rainfall was relatively high during the Medieval Warm Period (1000-600 cal. years B.P.), low during the Little Ice Age (600-350 cal. years B.P.) and from 350 cal. years B.P. to the Present, it exhibited an increasing trend.

Original languageEnglish
Pages (from-to)47-56
Number of pages10
JournalEpisodes
Volume40
Issue number1
DOIs
Publication statusPublished - 01-03-2017

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sediment core
lacustrine deposit
reflectance
environmental change
spectroscopy
monsoon
goethite
Medieval Warm Period
rainfall
Little Ice Age
lake
magnetic susceptibility
hematite
sediment
clay mineral
magnetite
organic carbon
clay
history
parameter

All Science Journal Classification (ASJC) codes

  • Earth and Planetary Sciences(all)

Cite this

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abstract = "Pookot is a small freshwater lake situated in the Sahyadri (the Western Ghat) of southern India. We used diffuse reflectance spectroscopy (DRS) and magnetic parameters to characterize the sediment components present in a core dating back to ~3000 cal. years B.P. DRS data indicate the presence of CaCO3, goethite, hematite/goethite, clay minerals and organic carbon in the lake sediments. Based on the down-core variations of the four components, and the values of xlf (low-field magnetic susceptibility indicative of detrital magnetite) and DRS parameter redness {\%}, we reconstructed the paleoenvironmental history of the region surrounding the lake. The down-core variations of DRS-determined sediment composition and of data obtained from independent analyses (CaCO3, S-ratio, clay {\%} and Corg {\%}) are similar. The pre-2500 cal. years B.P. period was characterized by a stronger monsoon compared to the Present. From 2500-1000 cal. years B.P., the monsoon was weak and steady, but interspersed with brief periods of strong monsoon, whereas from 1000 cal. years B.P. to the Present, rainfall exhibited a fluctuating trend. Rainfall was relatively high during the Medieval Warm Period (1000-600 cal. years B.P.), low during the Little Ice Age (600-350 cal. years B.P.) and from 350 cal. years B.P. to the Present, it exhibited an increasing trend.",
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Diffuse reflectance spectroscopy of a tropical southern Indian lake sediment core : A window to environmental change. / Sandeep, K.; Shankar, R.; Warrier, A. K.; Balsam, W.

In: Episodes, Vol. 40, No. 1, 01.03.2017, p. 47-56.

Research output: Contribution to journalArticle

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AB - Pookot is a small freshwater lake situated in the Sahyadri (the Western Ghat) of southern India. We used diffuse reflectance spectroscopy (DRS) and magnetic parameters to characterize the sediment components present in a core dating back to ~3000 cal. years B.P. DRS data indicate the presence of CaCO3, goethite, hematite/goethite, clay minerals and organic carbon in the lake sediments. Based on the down-core variations of the four components, and the values of xlf (low-field magnetic susceptibility indicative of detrital magnetite) and DRS parameter redness %, we reconstructed the paleoenvironmental history of the region surrounding the lake. The down-core variations of DRS-determined sediment composition and of data obtained from independent analyses (CaCO3, S-ratio, clay % and Corg %) are similar. The pre-2500 cal. years B.P. period was characterized by a stronger monsoon compared to the Present. From 2500-1000 cal. years B.P., the monsoon was weak and steady, but interspersed with brief periods of strong monsoon, whereas from 1000 cal. years B.P. to the Present, rainfall exhibited a fluctuating trend. Rainfall was relatively high during the Medieval Warm Period (1000-600 cal. years B.P.), low during the Little Ice Age (600-350 cal. years B.P.) and from 350 cal. years B.P. to the Present, it exhibited an increasing trend.

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