Palaeolimnological records of regime shifts from marine-to-lacustrine system in a coastal Antarctic lake in response to post-glacial isostatic uplift

Badanal Siddaiah Mahesh, Abhilash Nair, Anish Kumar Warrier, Anirudha Avadhani, Rahul Mohan, Manish Tiwari

Research output: Contribution to journalArticle

Abstract

Low altitude coastal lakes along the Antarctic margin often contain both marine and lacustrine sediments as a result of relative sea level changes due to deglaciation. The sediments also record changes in regional climate. A sediment core from a coastal lake in Larsemann Hills, East Antarctica, viz. Stepped Lake (Heart Lake), records distinct changes in C, N, C/Natomic ratio, δ 13COM, δ 15NOM and diatom abundance during the mid-Holocene (8.3 to 4.6 kyr BP). Lower values (Corg ~1%; C/N 8, 13COM ~ -18‰) during the early Holocene (8.3-4 kyr BP) are consistent with marine conditions, while higher values [Corg 6%; C/N 12; 13COM ~ -12‰) suggest a shift to lacustrine conditions (5.5-4.6 kyr BP). The diatom community shows similar shift with the major part of Holocene (8.3- 5.5 kyr BP) dominated by sea-ice and open-ocean diatoms while the core-top sections (5.5-4.6 kyr BP) transitions to lacustrine diatoms (Stauroforma inermis). These observations confirm that the basin was marine, and later became isolated as a result of postglacial isostatic uplift after 4.7 kyr BP.

Original languageEnglish
Pages (from-to)1679-1683
Number of pages5
JournalCurrent Science
Volume115
Issue number9
DOIs
Publication statusPublished - 01-11-2018

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Postglacial
diatom
uplift
lake
Holocene
deglaciation
open ocean
sea level change
regional climate
marine sediment
sediment core
lacustrine deposit
sea ice
basin
sediment

All Science Journal Classification (ASJC) codes

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Mahesh, Badanal Siddaiah ; Nair, Abhilash ; Warrier, Anish Kumar ; Avadhani, Anirudha ; Mohan, Rahul ; Tiwari, Manish. / Palaeolimnological records of regime shifts from marine-to-lacustrine system in a coastal Antarctic lake in response to post-glacial isostatic uplift. In: Current Science. 2018 ; Vol. 115, No. 9. pp. 1679-1683.
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Palaeolimnological records of regime shifts from marine-to-lacustrine system in a coastal Antarctic lake in response to post-glacial isostatic uplift. / Mahesh, Badanal Siddaiah; Nair, Abhilash; Warrier, Anish Kumar; Avadhani, Anirudha; Mohan, Rahul; Tiwari, Manish.

In: Current Science, Vol. 115, No. 9, 01.11.2018, p. 1679-1683.

Research output: Contribution to journalArticle

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