Holocene climate variability from lake sediment core in Larsemann Hills,Antarctica |
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| Authors: | Pawan Govil Abhijit Mazumder Anoop Tiwari Sandeep Kumar |
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| Institution: | (1) Department of Environmental Studies, School of Social Information Studies, Otsuma Women’s University, 2-7-1 Karakida, Tama-shi, Tokyo 206-8540, Japan;(2) Institute for Environmental Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan;(3) Research Center for Coastal Lagoon Environments, Shimane University, 1060 Nishikawatsu-cho, Matsue 690-8504, Japan;(4) Department of Chemistry, Faculty of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan;(5) Geological Survey of Japan, AIST Tsukuba Central 7, 1-1-1 Higashi, Tsukuba 305-8567, Japan;(6) Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa 277-8563, Japan;(7) Graduate School of Science, Tohoku University, 6-3 Aramaki, Aoba-ku, Sendai 980-8578, Japan;(8) Center for Chronological Research, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan;(9) National Institute of Polar Research, 10-3 Midori-cho, Tachikawa-shi, Tokyo 190-8518, Japan |
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| Abstract: | A sediment core (L2) from Larsemann Hills, Antarctica was analyzed for Biogenic Silica (BSi), Sand (%) and Total Organic Carbon
(TOC). The 78 cm core length represents the time span of ∼8.3 cal ka BP. The values of BSi from the core show prominent high
productivity from ∼8.3 to ∼6 cal ka BP in comparison to less productivity in mid-late Holocene (∼6 cal ka BP to recent). Moreover,
high sand (%) infers the glacio-fluvial deposition from ∼8.3 to ∼5 cal ka BP TOC shows little variation through out the core,
except in the upper ∼10 cm (∼4 cal ka BP) part wherein it is comparatively high. The increased TOC in the upper part of the
core possibly indicates presence of algal mat due to exposure of the lake to the ice free (glacier free) conditions. |
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