Blue Lake, South Australia 6,000 Year Ostracod Geochemical Data Gouramanis, C.; Wilkins, D.; De Deckker, P. Gouramanis, C. Wilkins, D. De Deckker, P. earth science/paleoclimate/paleolimnology (strontium/calcium,ostracod,null,mole per mole,null,paleolimnology,null,inductively-coupled plasma mass spectrometry,N,ostracod G. australica; Relative Standard Deviation; <5%; values for each species at each depth cannot be averaged due to lack of normalisation of geochemistry across species) earth science/paleoclimate/paleolimnology (strontium/calcium,ostracod,null,mole per mole,null,paleolimnology,null,inductively-coupled plasma mass spectrometry,N,ostracod C. novaezelandiae; Relative Standard Deviation; <5%; values for each species at each depth cannot be averaged due to lack of normalisation of geochemistry across species) earth science/paleoclimate/paleolimnology (strontium/calcium,ostracod,null,mole per mole,null,paleolimnology,null,inductively-coupled plasma mass spectrometry,N,ostracod I. smaragdinus; Relative Standard Deviation; <5%; values for each species at each depth cannot be averaged due to lack of normalisation of geochemistry across species) earth science/paleoclimate/paleolimnology (sodium/calcium,ostracod,null,mole per mole,null,paleolimnology,null,inductively-coupled plasma mass spectrometry,N,ostracod L. mowbrayensis; Relative Standard Deviation; <5%; values for each species at each depth cannot be averaged due to lack of normalisation of geochemistry across species) earth science/paleoclimate/paleolimnology (magnesium/calcium,ostracod,null,mole per mole,null,paleolimnology,null,inductively-coupled plasma mass spectrometry,N,ostracod I. smaragdinus; Relative Standard Deviation; <5%; values for each species at each depth cannot be averaged due to lack of normalisation of geochemistry across species) earth science/paleoclimate/paleolimnology (strontium/calcium,ostracod,null,mole per mole,null,paleolimnology,null,inductively-coupled plasma mass spectrometry,N,ostracod L. dorsosicula; Relative Standard Deviation; <5%; values for each species at each depth cannot be averaged due to lack of normalisation of geochemistry across species) earth science/paleoclimate/paleolimnology (sodium/calcium,ostracod,null,mole per mole,null,paleolimnology,null,inductively-coupled plasma mass spectrometry,N,ostracod G. australica; Relative Standard Deviation; <5%; values for each species at each depth cannot be averaged due to lack of normalisation of geochemistry across species) earth science/paleoclimate/paleolimnology (sodium/calcium,ostracod,null,mole per mole,null,paleolimnology,null,inductively-coupled plasma mass spectrometry,N,ostracod I. smaragdinus; Relative Standard Deviation; <5%; values for each species at each depth cannot be averaged due to lack of normalisation of geochemistry across species) earth science/paleoclimate/paleolimnology (delta 18O,ostracod,null,per mil VPDB,null,paleolimnology,null,isotope ratio mass spectrometry,N,ostracod C. novaezelandiae; error 0.08 per mil; values for each species at each depth cannot be averaged due to lack of normalisation of geochemistry across species) earth science/paleoclimate/climate reconstructions|paleolimnology (salinity,lake water|ostracod assemblage,null,milligram per liter,null,climate reconstructions|paleolimnology,null,modern analogue technique,N,Root Mean Square Error: 0.23 bootstrapped R2: 0.84; training set based on 537 modern samples; weighted average of 10 modern analogues) earth science/paleoclimate/climate reconstructions|paleolimnology (age,null,null,calendar year before present,null,climate reconstructions|paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (magnesium/calcium,ostracod,null,mole per mole,null,paleolimnology,null,inductively-coupled plasma mass spectrometry,N,ostracod L. dorsosicula; Relative Standard Deviation; <5%; values for each species at each depth cannot be averaged due to lack of normalisation of geochemistry across species) earth science/paleoclimate/paleolimnology (sodium/calcium,ostracod,null,mole per mole,null,paleolimnology,null,inductively-coupled plasma mass spectrometry,N,ostracod L. dorsosicula; Relative Standard Deviation; <5%; values for each species at each depth cannot be averaged due to lack of normalisation of geochemistry across species) earth science/paleoclimate/paleolimnology (magnesium/calcium,ostracod,null,mole per mole,null,paleolimnology,null,inductively-coupled plasma mass spectrometry,N,ostracod G. australica; Relative Standard Deviation; <5%; values for each species at each depth cannot be averaged due to lack of normalisation of geochemistry across species) earth science/paleoclimate/paleolimnology (magnesium/calcium,ostracod,null,mole per mole,null,paleolimnology,null,inductively-coupled plasma mass spectrometry,N,ostracod C. novaezelandiae; Relative Standard Deviation; <5%; values for each species at each depth cannot be averaged due to lack of normalisation of geochemistry across species) earth science/paleoclimate/paleolimnology (sodium/calcium,ostracod,null,mole per mole,null,paleolimnology,null,inductively-coupled plasma mass spectrometry,N,ostracod C. novaezelandiae; Relative Standard Deviation; <5%; values for each species at each depth cannot be averaged due to lack of normalisation of geochemistry across species) earth science/paleoclimate/paleolimnology (delta 18O,ostracod,null,per mil VPDB,null,paleolimnology,null,isotope ratio mass spectrometry,N,ostracod G. australica; error 0.08 per mil; values for each species at each depth cannot be averaged due to lack of normalisation of geochemistry across species) earth science/paleoclimate/paleolimnology (delta 18O,ostracod,null,per mil VPDB,null,paleolimnology,null,isotope ratio mass spectrometry,N,ostracod I. smaragdinus; error 0.08 per mil; values for each species at each depth cannot be averaged due to lack of normalisation of geochemistry across species) earth science/paleoclimate/paleolimnology (strontium/calcium,ostracod,null,mole per mole,null,paleolimnology,null,inductively-coupled plasma mass spectrometry,N,ostracod L. mowbrayensis; Relative Standard Deviation; <5%; values for each species at each depth cannot be averaged due to lack of normalisation of geochemistry across species) earth science/paleoclimate/climate reconstructions|paleolimnology (total dissolved solids,ostracod assemblage,null,milligram per liter,null,climate reconstructions|paleolimnology,null,modern analogue technique,N,Root Mean Square Error: 0.23 bootstrapped R2: 0.84; training set based on 537 modern samples; weighted average of 10 modern analogues) earth science/paleoclimate/climate reconstructions|paleolimnology (depth,null,null,centimeter,null,climate reconstructions|paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (magnesium/calcium,ostracod,null,mole per mole,null,paleolimnology,null,inductively-coupled plasma mass spectrometry,N,ostracod L. mowbrayensis; Relative Standard Deviation; <5%; values for each species at each depth cannot be averaged due to lack of normalisation of geochemistry across species) earth science/paleoclimate/paleolimnology earth science/paleoclimate/paleolimnology earth science/paleoclimate/paleolimnology (Blue Lake SA>LATITUDE -37.014087>LONGITUDE 140.012913) A 4 m long core taken from the freshwater Blue Lake crater near the township of Mount Gambier in southeastern South Australia provided a high-resolution palaeoclimatic record for the last six millennia. Accelerator Mass Spectrometry (AMS) radiocarbon (14C) dates were obtained from organic plant fibres and biogenic carbonates from the laminated sequence of the core and from a modern water sample. Large discrepancies between the radiocarbon ages determined from plant fibres and biogenic carbonates indicate the presence of a time-variable lacustrine reservoir, which is consistent with what is known of the lake's hydrology. Ostracod assemblages, associated with stable isotope (d13C, d18O) analyses and, in combination with Mg/Ca, Sr/Ca and Na/Ca analyses done on ostracod valves, infer salinity, temperature and water level changes in Blue Lake over the last 6 millenia. The influence of local aquifers through time has also been determined from the Na/Ca of ostracod valves. Approximately 900 year cycles are evident in the d13C record from 5.4 ka to 1.8 ka. The history of Blue Lake records an initial period of high hydrological variability around 6 ka, becoming increasingly deeper as groundwater flowed into the basin. By 4 ka, the lake had reached steady state with the lake level fluctuating by as much as 9 m, although significant geochemical variations represent temperature fluctuations until European settlement near the lake in 1839. STUDY NOTES: Ostracod geochemical (Mg/Ca, Sr/Ca, Na/Ca) and stable isotope (d18O, d13C) data and reconstructed salinity for the past 6,000 years from sediments collected in Blue Lake, South Australia. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Gouramanis, C. Investigator : Wilkins, D. Investigator : De Deckker, P. 2017-07-10 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/22411 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/australia/blue2010ostracod.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/australia/blue2010ostracod.txt English https://www.ncdc.noaa.gov/paleo/study/22411 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/australia/blue2010ostracod.txt Chris Gouramanis, Daniel Wilkins, Patrick De Deckker20116000 years of environmental changes recorded in Blue Lake, South Australia, based on ostracod ecology and valve chemistryPalaeogeography, Palaeoclimatology, Palaeoecology2971223-23710.1016/j.palaeo.2010.08.005http://www.sciencedirect.com/science/article/pii/S0031018210004955 START YEAR: 5690 cal yr BP * END YEAR: 5 cal yr BP 140.012913 -37.014087 140.012913 -37.014087