Data

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

Australian Antarctic Division
McMinn, A. and Roberts, D. ; MCMINN, ANDREW ; ROBERTS, DONNA
Viewed: [[ro.stat.viewed]] Cited: [[ro.stat.cited]] Accessed: [[ro.stat.accessed]]
ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=http://data.aad.gov.au/metadata/ASAC_784&rft.title=Palaeoclimate Analysis of Sediment Cores from the Fjords and Lakes of the Vestfold Hills&rft.identifier=http://data.aad.gov.au/metadata/ASAC_784&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.Progress Code: completedStatement: Dates provided in temporal coverage are approximate only.&rft.creator=McMinn, A. and Roberts, D. &rft.creator=MCMINN, ANDREW &rft.creator=ROBERTS, DONNA &rft.date=2000&rft.coverage=westlimit=77.86548; southlimit=-68.76214; eastlimit=78.8269; northlimit=-68.37895&rft.coverage=westlimit=77.86548; southlimit=-68.76214; eastlimit=78.8269; northlimit=-68.37895&rft.coverage=uplimit=13; downlimit=-28&rft.coverage=uplimit=13; downlimit=-28&rft.coverage=uplimit=60; downlimit=3&rft.coverage=uplimit=60; downlimit=3&rft_rights=The dataset is publicly available for download from the provided URL.&rft_rights=Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/legalcode&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_rights=This metadata record is publicly available.&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=EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > FRESHWATER ECOSYSTEMS > LAKE/POND > SALINE LAKES&rft_subject=EARTH SCIENCE > BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > BIOMASS DYNAMICS&rft_subject=EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > PLANTS > MICROALGAE > DIATOMS&rft_subject=EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > PROTISTS > DIATOMS&rft_subject=EARTH SCIENCE > PALEOCLIMATE > OCEAN/LAKE RECORDS > SEDIMENTS&rft_subject=EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY&rft_subject=EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > SOLIDS > TOTAL DISSOLVED SOLIDS&rft_subject=EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > GASES > DISSOLVED GASES&rft_subject=EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > WATER CHARACTERISTICS > ALKALINITY&rft_subject=ABUNDANCE&rft_subject=ACE LAKE&rft_subject=ALKALINITY&rft_subject=ANTARCTIC&rft_subject=CALCIUM&rft_subject=ANTARCTICA&rft_subject=CALCIUM CARBONATE&rft_subject=CHLORINE&rft_subject=ELEVATION&rft_subject=DIATOMS&rft_subject=HYPERSALINE&rft_subject=FRESH&rft_subject=LAKES&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=CEOS&rft_subject=AMD/AU&rft_subject=AMD&rft_subject=CONTINENT > ANTARCTICA > Vestfold Hills&rft_subject=GEOGRAPHIC REGION > POLAR&rft.type=dataset&rft.language=English Access the data
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The dataset is publicly available for download from the provided URL.

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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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.

Lineage

Progress Code: completed
Statement: Dates provided in temporal coverage are approximate only.

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

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78.8269,-68.37895 78.8269,-68.76214 77.86548,-68.76214 77.86548,-68.37895 78.8269,-68.37895

78.34619,-68.570545

text: westlimit=77.86548; southlimit=-68.76214; eastlimit=78.8269; northlimit=-68.37895

text: uplimit=13; downlimit=-28

text: uplimit=60; downlimit=3

Subjects
ABUNDANCE | ACE LAKE | ALKALINITY | AMD | AMD/AU | ANTARCTIC | ANTARCTICA | CALCIUM | CALCIUM CARBONATE | CEOS | CHLORINE | CONTINENT > ANTARCTICA > Vestfold Hills | DIATOMS | EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > PLANTS > MICROALGAE > DIATOMS | EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > PROTISTS > DIATOMS | EARTH SCIENCE > BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > BIOMASS DYNAMICS | EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > FRESHWATER ECOSYSTEMS > LAKE/POND | EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > FRESHWATER ECOSYSTEMS > LAKE/POND > SALINE LAKES | EARTH SCIENCE > PALEOCLIMATE > OCEAN/LAKE RECORDS > SEDIMENTS | EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > SURFACE WATER > SURFACE WATER FEATURES > LAKES/RESERVOIRS | EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY | EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > GASES > DISSOLVED GASES | EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > SOLIDS > TOTAL DISSOLVED SOLIDS | EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > WATER CHARACTERISTICS > ALKALINITY | ELEVATION | FIELD SURVEYS | FRESH | GEOGRAPHIC REGION > POLAR | HOLOMICTIC | HYPERSALINE | HYPOSALINE | LAKES | LATITUDE | LONGITUDE | MAGNESIUM | MARINE | MEROMICTIC | NITRATE | PHOSPHATE | POTASSIUM | SALINITY | SEDIMENT CORERS | SILICA | SODIUM | SPECIES | SULPHUR | VESTFOLD HILLS | climatologyMeteorologyAtmosphere | geoscientificInformation | oceans |

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Other Information
Download point for the data (GET DATA > DIRECT DOWNLOAD)

url : https://data.aad.gov.au/eds/1320/download

Public information for ASAC project 784 (PROJECT HOME PAGE)

url : https://projects.aad.gov.au/search_projects_results.cfm?project_no=784

Citation reference for this metadata record and dataset (VIEW RELATED INFORMATION)

url : http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_784

Identifiers
  • global : ASAC_784
ACN 633 798 857