Wimmera Lakes, Australia Holocene Ostracod Salinity Reconstruction Kemp, J.; Radke, L.C.; Olley, J.; Juggins, S.; De Deckker, P. Kemp, J. Radke, L.C. Olley, J. Juggins, S. De Deckker, P. hydrology earth science/paleoclimate/climate reconstructions|paleolimnology (age,null,null,year Common Era,null,climate reconstructions|paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (depth,null,null,centimeter,null,paleolimnology,null,null,N,null) earth science/paleoclimate/climate reconstructions|paleolimnology (salinity,lake water|ostracod assemblage,null,gram per liter,null,climate reconstructions|paleolimnology,null,null,N,log salinity; r2 between observed and estimated log salinity r2=0.91; root mean square error=0.167log10 units; root mean square error prediction =0.27log10 units; salinity relationship of ecological assemblage based on modern ostracod training set) 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 (delta 18O,ostracod,null,per mil VPDB,null,paleolimnology,null,isotope ratio mass spectrometry,N,D. compacta ostracod test) earth science/paleoclimate/paleolimnology (sand,dry sediment,null,count per gram,null,paleolimnology,null,null,N,quartz sand grain/dry weight sediment <130um) earth science/paleoclimate/paleolimnology (age,null,null,year Common Era,null,paleolimnology,null,null,N,null) earth science/paleoclimate/climate reconstructions|paleolimnology (depth,null,null,centimeter,null,climate reconstructions|paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (delta 18O,foraminifer,null,per mil VPDB,null,paleolimnology,null,isotope ratio mass spectrometry,N,Elphidium foram test) earth science/paleoclimate/paleolimnology (age,null,null,calendar year before present,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (delta 18O,ostracod,null,per mil VPDB,null,paleolimnology,null,isotope ratio mass spectrometry,N,Reticypris ostracod test) earth science/paleoclimate/paleolimnology earth science/paleoclimate/paleolimnology earth science/paleoclimate/paleolimnology (Jacka Lake>LATITUDE -36.8>LONGITUDE 141.8) Palaeosalinity records for groundwater-influenced lakes in the southwest Murray Basin were constructed from an ostracod-based, weighted-averaging transfer function, supplemented with evidence from Campylodiscus clypeus (diatom), charophyte oogonia, Coxiella striata (gastropod), Elphidium sp. (foraminifera), Daphniopsis sp. ephippia (Cladocera), and brine shrimp (Parartemia zietziana) faecal pellets, the d18O of ostracods, and > 130 um quartz sand counts. The chronology is based on optically stimulated luminescence and calibrated radiocarbon ages. Relatively wet conditions are marked by lower salinities between 9600 yr and 5700 yr ago, but mutually exclusive high- and low-salinity ostracod communities suggest substantial variability in effective precipitation in the early Holocene. A drier climate was firmly in place by 4500 yr and is marked at the groundwater-dominated NW Jacka Lake by an increase in aeolian quartz and at Jacka Lake, by a switch from surface-water to groundwater dominance. Short-lived, low-salinity events at 8800, 7200, 5900, 4800, 2400, 1300 and 400 yr are similar in timing and number to those recorded on Australia's southern continental shelf, and globally, and provide evidence for the existence of the ~ 1500-yr cycle in mainland southern Australia. We surmise that these are cool events associated with periodic equatorward shifts in the westerly wind circulation. STUDY NOTES: Wimmera Lakes, Victoria, Australia Ostracod Holocene physical properties and d18O data and salinity reconstruction. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Kemp, J. Investigator : Radke, L.C. Investigator : Olley, J. Investigator : Juggins, S. Investigator : De Deckker, P. 2017-07-16 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/22414 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/australia/jacka2012.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/australia/nw-jacka2012.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/australia/nw-jacka2012iso.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/australia/jacka2012.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/australia/nw-jacka2012.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/australia/nw-jacka2012iso.txt English https://www.ncdc.noaa.gov/paleo/study/22414 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/australia/jacka2012.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/australia/nw-jacka2012.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/australia/nw-jacka2012iso.txt Justine Kemp, Lynda C. Radke, Jon Olley, Steve Juggins, Patrick De Deckker 2012Holocene lake salinity changes in the Wimmera, southeastern Australia, provide evidence for millennial-scale climateQuaternary Research77165-7610.1016/j.yqres.2011.09.013 START YEAR: 11394 cal yr BP * END YEAR: -50 cal yr BP 141.8 -36.8 141.8 -36.8