Data

Palaeoclimate Analysis of Sediment Cores from the Fjords and Lakes of the Vestfold Hills

Name: Palaeoclimate Analysis of Sediment Cores from the Fjords and Lakes of the Vestfold Hills
Published: 2000-08-07

Australian Antarctic Data Centre

MCMINN, ANDREW ; ROBERTS, DONNA

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ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=info:doi10.4225/15/58464d7d6d3f6&rft.title=Palaeoclimate Analysis of Sediment Cores from the Fjords and Lakes of the Vestfold Hills&rft.identifier=10.4225/15/58464d7d6d3f6&rft.publisher=Australian Antarctic Data Centre&rft.description=From the abstracts of some of the referenced papers: The relationship between surface sediment diatom assemblages and measured limnological variables in 33 coastal Antarctic lakes was examined by constructing a diatom-water chemistry dataset. Canonical correspondence analysis revealed that salinity and silicate each explain significant amounts of variation in the distribution and abundance of the surface sediment diatom taxa. Salinity has the strongest influence, revealing its value for limnological inference models in this coastal Antarctic region. A comprehensive diatom stratigraphy is used to calculate a palaeosalinity history for an Antarctic lake via an established diatom-salinity transfer function for the Vestfold Hills, Antarctica. A sediment core taken from Ace Lake in 1995 shows three distinct changes in diatom assemblage constituents: initial benthic hyposaline - freshwater taxa are replaced by marine planktonic and sea-ice taxa with these taxa in turn replaced by the benthic hypersaline taxa dominant in the lake today. These changes in assemblage composition enable the lakewater salininty of each stage to be determined, and the Holocene evolution of the lake to be refined. Deglaciation of the Vestfold Hills at the beginning of the Holocene exposed Ace Lake basin; following this, fresh lacustrine diatoms were deposited from ~11 380 to ~8110 corrected 14C yrBP. Relative sea-level rise after this time led to the progressive marine inundation of the lake and the deposition of marine diatom taxa. Marine taxa were dominant in the sediment for more than 6000 years. Isostatic rebound and stabilisation of the sea-level isolated Ace Lake and at ~1480 corrected 14C yrBP saline lacustrine diatoms became the dominant taxa, indicative of the concentration of dissolved salts through evaporation after isolation.&rft.creator=MCMINN, ANDREW &rft.creator=ROBERTS, DONNA &rft.date=2000&rft.coverage=northlimit=-68.37895; southlimit=-68.76214; westlimit=77.86548; eastLimit=78.8269; projection=WGS84&rft.coverage=northlimit=-68.37895; southlimit=-68.76214; westlimit=77.86548; eastLimit=78.8269; projection=WGS84&rft_rights=This data set conforms to the CCBY Attribution License (http://creativecommons.org/licenses/by/4.0/). Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_784 when using these data.&rft_subject=climatologyMeteorologyAtmosphere&rft_subject=geoscientificInformation&rft_subject=oceans&rft_subject=EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > SURFACE WATER > SURFACE WATER FEATURES > LAKES/RESERVOIRS&rft_subject=EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > FRESHWATER ECOSYSTEMS > LAKE/POND&rft_subject=SALINE LAKES&rft_subject=EARTH SCIENCE&rft_subject=BIOSPHERE&rft_subject=AQUATIC ECOSYSTEMS&rft_subject=LAKES&rft_subject=BIOMASS DYNAMICS&rft_subject=ECOLOGICAL DYNAMICS&rft_subject=ECOSYSTEM FUNCTIONS&rft_subject=DIATOMS&rft_subject=BIOLOGICAL CLASSIFICATION&rft_subject=PLANTS&rft_subject=MICROALGAE&rft_subject=SEDIMENTS&rft_subject=PALEOCLIMATE&rft_subject=OCEAN/LAKE RECORDS&rft_subject=WATER QUALITY/WATER CHEMISTRY&rft_subject=TERRESTRIAL HYDROSPHERE&rft_subject=EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > SOLIDS > TOTAL DISSOLVED SOLIDS&rft_subject=DISSOLVED GASES&rft_subject=ALKALINITY&rft_subject=ABUNDANCE&rft_subject=ACE LAKE&rft_subject=ANTARCTIC&rft_subject=CALCIUM&rft_subject=ANTARCTICA&rft_subject=CALCIUM CARBONATE&rft_subject=CHLORINE&rft_subject=ELEVATION&rft_subject=HYPERSALINE&rft_subject=FRESH&rft_subject=HOLOMICTIC&rft_subject=MAGNESIUM&rft_subject=MEROMICTIC&rft_subject=HYPOSALINE&rft_subject=LATITUDE&rft_subject=POTASSIUM&rft_subject=SILICA&rft_subject=SULPHUR&rft_subject=LONGITUDE&rft_subject=MARINE&rft_subject=NITRATE&rft_subject=PHOSPHATE&rft_subject=SALINITY&rft_subject=SPECIES&rft_subject=SODIUM&rft_subject=VESTFOLD HILLS&rft_subject=SEDIMENT CORERS&rft_subject=FIELD SURVEYS&rft_subject=CONTINENT > ANTARCTICA > Vestfold Hills&rft_subject=GEOGRAPHIC REGION > POLAR&rft_place=Hobart&rft.type=dataset&rft.language=English Access the data

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This data set conforms to the CCBY Attribution License (http://creativecommons.org/licenses/by/4.0/). Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_784 when using these data.

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Brief description

From the abstracts of some of the referenced papers:

The relationship between surface sediment diatom assemblages and measured limnological variables in 33 coastal Antarctic lakes was examined by constructing a diatom-water chemistry dataset. Canonical correspondence analysis revealed that salinity and silicate each explain significant amounts of variation in the distribution and abundance of the surface sediment diatom taxa. Salinity has the strongest influence, revealing its value for limnological inference models in this coastal Antarctic region.

A comprehensive diatom stratigraphy is used to calculate a palaeosalinity history for an Antarctic lake via an established diatom-salinity transfer function for the Vestfold Hills, Antarctica. A sediment core taken from Ace Lake in 1995 shows three distinct changes in diatom assemblage constituents: initial benthic hyposaline - freshwater taxa are replaced by marine planktonic and sea-ice taxa with these taxa in turn replaced by the benthic hypersaline taxa dominant in the lake today. These changes in assemblage composition enable the lakewater salininty of each stage to be determined, and the Holocene evolution of the lake to be refined. Deglaciation of the Vestfold Hills at the beginning of the Holocene exposed Ace Lake basin; following this, fresh lacustrine diatoms were deposited from ~11 380 to ~8110 corrected 14C yrBP. Relative sea-level rise after this time led to the progressive marine inundation of the lake and the deposition of marine diatom taxa. Marine taxa were dominant in the sediment for more than 6000 years. Isostatic rebound and stabilisation of the sea-level isolated Ace Lake and at ~1480 corrected 14C yrBP saline lacustrine diatoms became the dominant taxa, indicative of the concentration of dissolved salts through evaporation after isolation.

Issued: 2000-08-07

Data time period: 1995-10-01 to 1996-03-31

This dataset is part of a larger collection

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text: northlimit=-68.37895; southlimit=-68.76214; westlimit=77.86548; eastLimit=78.8269; projection=WGS84

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AU-ANL:PEAU : http://nla.gov.au/nla.party-617536 NLA Link

Identifiers

global : 9ab4ed6f-a96a-4e92-b156-57dd3178a749
DOI : 10.4225/15/58464d7d6d3f6
Local : ASAC_784
URI : https://data.aad.gov.au/metadata/records/ASAC_784
URI : https://data.aad.gov.au/metadata/records/ASAC_784

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