Impact of Antarctic climate during the Late Quaternary: Records from Zub Lake sedimentary archives from Schirmacher Hills, East Antarctica

Badanal Siddaiah Mahesh, Anish Kumar Warrier, Rahul Mohan, Manish Tiwari

Research output: Contribution to journalArticle

Abstract

The Antarctic continental margin is marked with ice-free areas which are host to numerous freshwater lakes. These lacustrine systems are rich in sedimentary deposits which archive in them the regional and general climatic variations. These lakes respond to the seasonal variations in climate over glacial-interglacial timescales and can be inferred from the sedimentary proxies. In this study, a 79-cm-long radiocarbon dated sediment core retrieved from a peri-glacial lake is analysed for elementary (Corg%, Norg%), isotopic (δ13COM, δ15NOM) and particle size (sand, silt, clay). The radiocarbon dated sections (0–65 cm) extends up to 43 kyr BP. The time-series of sedimentary organic matter (OM) proxies (Corg ~ 3.5 ± 3%, C/Natomic ratio ~ 11 ± 3 and δ13COM ~ −14 ± 4‰) indicate that the OM in this lake sedimentary record is an admixture of terrestrial and lacustrine biomass. Distinctly higher (lower) values during the Holocene (LGM) suggests presence of terrestrial and aquatic (aquatic) biomass indicating ice-free (ice-cover) and warm (cold) Holocene (glacial) conditions which would result in an increased (decreased) lake-productivity and fluvial (wind) input of sand and clay (silt). Higher sand content (~30, ~24 and ~15 kyr BP), silt content (~24 kyr BP), Corg and Norg (~24 kyr BP) within the Last Glacial Stage (LGS) indicates intermittent warming period in coherence with the Antarctic Isotope Maximum (AIM). The transition in values (Corg, Norg, C/N ratio, δ13COM, sand content) starting at 16.6 kyr BP closely following Antarctic deglaciation to reach Holocene optimum values at 11.3 kyr BP documents the influence of Antarctic climate on regional areas.

LanguageEnglish
Pages398-406
Number of pages9
JournalPalaeogeography, Palaeoclimatology, Palaeoecology
Volume514
DOIs
Publication statusPublished - 15-01-2019

Fingerprint

Antarctica
climate
lakes
silt
sand
lake
Holocene
ice
organic matter
clay
glacial lake
biomass
Last Glacial
deglaciation
ice cover
interglacial
sediment core
continental margin
seasonal variation
warming

All Science Journal Classification (ASJC) codes

  • Oceanography
  • Ecology, Evolution, Behavior and Systematics
  • Earth-Surface Processes
  • Palaeontology

Cite this

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title = "Impact of Antarctic climate during the Late Quaternary: Records from Zub Lake sedimentary archives from Schirmacher Hills, East Antarctica",
abstract = "The Antarctic continental margin is marked with ice-free areas which are host to numerous freshwater lakes. These lacustrine systems are rich in sedimentary deposits which archive in them the regional and general climatic variations. These lakes respond to the seasonal variations in climate over glacial-interglacial timescales and can be inferred from the sedimentary proxies. In this study, a 79-cm-long radiocarbon dated sediment core retrieved from a peri-glacial lake is analysed for elementary (Corg{\%}, Norg{\%}), isotopic (δ13COM, δ15NOM) and particle size (sand, silt, clay). The radiocarbon dated sections (0–65 cm) extends up to 43 kyr BP. The time-series of sedimentary organic matter (OM) proxies (Corg ~ 3.5 ± 3{\%}, C/Natomic ratio ~ 11 ± 3 and δ13COM ~ −14 ± 4‰) indicate that the OM in this lake sedimentary record is an admixture of terrestrial and lacustrine biomass. Distinctly higher (lower) values during the Holocene (LGM) suggests presence of terrestrial and aquatic (aquatic) biomass indicating ice-free (ice-cover) and warm (cold) Holocene (glacial) conditions which would result in an increased (decreased) lake-productivity and fluvial (wind) input of sand and clay (silt). Higher sand content (~30, ~24 and ~15 kyr BP), silt content (~24 kyr BP), Corg and Norg (~24 kyr BP) within the Last Glacial Stage (LGS) indicates intermittent warming period in coherence with the Antarctic Isotope Maximum (AIM). The transition in values (Corg, Norg, C/N ratio, δ13COM, sand content) starting at 16.6 kyr BP closely following Antarctic deglaciation to reach Holocene optimum values at 11.3 kyr BP documents the influence of Antarctic climate on regional areas.",
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Impact of Antarctic climate during the Late Quaternary : Records from Zub Lake sedimentary archives from Schirmacher Hills, East Antarctica. / Mahesh, Badanal Siddaiah; Warrier, Anish Kumar; Mohan, Rahul; Tiwari, Manish.

In: Palaeogeography, Palaeoclimatology, Palaeoecology, Vol. 514, 15.01.2019, p. 398-406.

Research output: Contribution to journalArticle

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