# Comparison of published versus recalibrated age models for Jacka Lake, Victoria #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # NOTE: Please cite original publication, online resource and date accessed when using this data. # If there is no publication information, please cite Investigator, title, online resource and date accessed. # # Description/Documentation lines begin with # # Data lines have no # # # Online_Resource: https://www.ncdc.noaa.gov/paleo/study/21731 # Description: NOAA Landing Page # Online_Resource: http://www1.ncdc.noaa.gov/pub/data/paleo/pages2k/dixon2017australasia/dixon2017jackalake.txt # Description: NOAA location of the template # # # Archive: Ostracod salinity reconstruction # # Parameter_Keywords: #--------------------------------------- # Contribution_Date # Date: 2017-12-11 #--------------------------------------- # File_Last_Modified_Date # Date: 2017-12-11 #--------------------------------------- # Title # Study_Name: Comparison of published versus recalibrated age models for Jacka Lake, Victoria #--------------------------------------- # Investigators # Investigators: Dixon, Bronwyn C.; Tyler, Jonathan J.; Lorrey, Andrew M; Goodwin, Ian D; Gergis, Joelle; Drysdale, Russell N #--------------------------------------- # Description_Notes_and_Keywords # Description: # Provided Keywords: age modelling, Bayesian #--------------------------------------- # Publication # Authors: Dixon, Bronwyn C.; Tyler, Jonathan J.; Lorrey, Andrew M; Goodwin, Ian D; Gergis, Joelle; Drysdale, Russell N # Published_Date_or_Year: 2017 # Published_Title: Low-resolution Australasian palaeoclimate records of the last 2000 years # Journal_Name: Climate of the Past # Volume: # Edition: # Issue: # Pages: # Report Number: # DOI: # Online_Resource: # Full_Citation: # Abstract: Non-annually resolved palaeoclimate records in the Australasian region were compiled to facilitate investigations of decadal to centennial climate variability over the past 2000 years. A total of 661 lake/wetland, geomorphic, marine, and speleothem records were identified and then assessed against a set of a priori criteria based on temporal resolution, record length, dating methods, and confidence of the proxy-climate relationship over the Common Era. A high quality subset of 22 records across Australasia met the criteria and they are endorsed for subsequent analyses. New chronologies based on progressive Bayesian techniques were constructed for the high quality records to ensure a consistent approach to age modelling and quantification of age uncertainties. Chronological uncertainty was the primary reason why records did not meet the selection criteria. Despite present limitations, existing proxies and reconstruction techniques that successfully capture climate variability in the region show potential to address spatial gaps and expand the range of climate variables covering the last 2000 years from the Australasian region. #--------------------------------------- # Publication # Authors: Kemp, J; Radke, LC; Olley, J; Juggins, S; De Deckker, P # Published_Date_or_Year: 2012 # Published_Title: Holocene lake salinity changes in the Wimmera, southeastern Australia, provide evidence for millennial-scale climate variability # Journal_Name: Quaternary Research # Volume: 77 # Edition: # Issue: # Pages: 1 # Report Number: 65-76 # DOI: # Online_Resource: 10.1016/j.yqres.2011.09.013 # Full_Citation: Kemp, J., Radke, L. C., Olley, J., Juggins, S. & De Deckker, P. 2012. Holocene lake salinity changes in the Wimmera, southeastern Australia, provide evidence for millennial-scale climate variability. Quaternary Research, 77, 65-76. # Abstract: 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 Compylodiscus clypeus (diatom), charophyte oogonia. Coxiella striata (gastropod), Elphidium sp. (foraminifera). Daphniopsis sp. ephippia (Cladocera), and brine shrimp (Parartemia zietziana) faecal pellets, the 8180 of ostracods, and >130 pm 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 surfacewater to groundwater dominance. Short-lived, low-salinity events at 8800, 7200, 5900, 480(1, 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. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: # Grant: #--------------------------------------- # Site Information # Site_Name: Jacka Lake # Location: # Country: # Northernmost_Latitude: -36.8 # Southernmost_Latitude: -36.8 # Easternmost_Longitude: 141.8 # Westernmost_Longitude: 141.8 # Elevation: 132 #--------------------------------------- # Data_Collection # Collection_Name: JL # First_Year: 7721 # Last_Year: 0 # Time_Unit: Cal Yr BP # Core_Length: 150 # Notes: Collected in 1994 #--------------------------------------- # Species # Species_Name: NA # Common_Name: NA # Tree_Species_Code: #--------------------------------------- # Chronology_Information # Chronology: # Reservoir age of 490 ±160 year applied to all 14C dates; OSL dates have been converted from years before 2000 to years BP (1950) # Lab ID ANU-9805 JL23 JL46 ANU-9806 JL66 ANU-9807 JL139 JL150 # Dated material Bulk sediment quartz sand quartz sand bulk sediment quartz sand bulk sediment quartz sand quartz sand # depth_bot (mm) 23 23 46 59 66 138 139 150 # depth_top (mm) NaN NaN NaN NaN NaN NaN NaN NaN # age (bp) NaN -21 565 NaN 935 NaN 7450 6950 # age14C (bp) 460 NaN NaN 1350 NaN 5430 NaN NaN # age_error (years) 140 15 130 130 85 170 1000 1000 # calibrated age (cal BP) NaN NaN NaN NaN NaN NaN NaN NaN # 2-sigma error of cal age (years) NaN NaN NaN NaN NaN NaN NaN NaN # cal_age_range_old (bp) 632 NaN NaN 1385 NaN 6395 NaN NaN # cal_age_range_young (2_s) 317 NaN NaN 1191 NaN 5999 NaN NaN # depth (mm) NaN NaN NaN NaN NaN NaN NaN NaN # thickness (mm) NaN NaN NaN NaN NaN NaN NaN NaN # notes Jacka Lake Jacka Lake Jacka Lake Jacka Lake Jacka Lake Jacka Lake Jacka Lake Jacka Lake # #--------------------------------------- # Variables # Data variables follow that are preceded by "##" in columns one and two. # Variables list, one per line, shortname-tab-longname components (9 components: what, material, error, units, seasonality, archive, detail, method, C or N for Character or Numeric data) ## Depth_cm ,Depth in the core,NA,,cm,NA,NA,NA,NA,N ## PublishedAge_YBP ,Ages from original record publication,NA,,Years before present (present=1950),NA,NA,NA,NA,N ## BACON0.05CI ,5% confidence interval age as calculated in BACON age modelling software,NA,,Years before present (present=1950),NA,NA,NA,NA,N ## BACON0.95CI ,95% confidence interval age as calculated in BACON age modelling software,NA,,Years before present (present=1950),NA,NA,NA,NA,N ## BACONmedian ,median sample age as calculated in BACON age modelling software,NA,,Years before present (present=1950),NA,NA,NA,NA,N ## BACONwmean ,weighted mean age as calculated in BACON age modelling software,NA,,Years before present (present=1950),NA,NA,NA,NA,N ## log salinity_g/L ,log Salinity,reconstruction from ostracod assemblage,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,grams/litre,NA,NA,NA,salinity relationship of ecological assemblage, based on modern ostracod training set,N ## sand(g/dwt(<130um)) ,Sand ,quartz sand grain,NA,grams/dry weight, sediment <130um,NA,quartz sand grain,,NA,N #------------------------ # Data # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Value: NA Jacka Lake Depth_cm PublishedAge_YBP BACON0.05CI BACON0.95CI BACONmedian BACONwmean log salinity_g/L sand(g/dwt(<130um)) 0 -50 -44 35 -30 -23 1.7162 16.43 6.5 -42 -12 157 47 54 1.732 8.46 10 -37 11 219 89 96 1.7345 6.89 12.5 -34 32 262 119 127 1.7269 2.06 18.5 -27 77 362 192 199 1.7129 37.84 23.5 -2 118 445 253 262 1.7115 697.23 28.5 110 199 564 354 364 1.4474 211.89 30 144 224 603 386 396 NA 30.66 31 167 245 625 407 416 1.3522 21 32 189 259 652 428 437 NA 28.23 33.5 223 287 685 459 469 1.3016 15.92 35 257 314 720 491 501 1.338 222.48 36 279 331 746 512 522 1.3605 407.77 37.5 313 361 780 544 554 1.3447 1269.72 38 324 369 796 554 565 1.3715 30 39.5 358 400 829 586 596 1.1143 146.28 40.5 380 419 854 606 616 NA 74.68 41 391 429 865 617 627 1.2912 0 42 414 448 893 638 648 NA 123.91 43 436 471 914 659 669 NA 53.41 44 459 489 940 679 690 NA 157.23 45 481 512 959 700 711 NA 84.67 46 504 527 982 719 731 0.9585 113.83 47 526 551 1006 744 755 1.2931 14.18 48 549 569 1038 766 779 0.95 5.62 49 571 592 1067 791 804 0.9332 6.43 50 594 608 1103 815 830 1.3048 8.93 51 616 633 1131 841 856 NA 12.99 52 639 650 1163 867 882 NA 7.83 53 661 673 1191 892 907 0.9868 0.72 54 684 693 1222 918 933 NA 22.76 55 706 717 1252 944 959 NA 2.71 56 729 736 1287 970 985 1.2634 13.7 57 751 761 1316 996 1010 NA 23.93 59 796 804 1375 1046 1061 1.2746 5.16 60 819 824 1410 1071 1087 1.2891 85.02 61 841 852 1447 1101 1117 1.2851 0.63 62 863 872 1502 1129 1147 1.3064 22.3 63 886 899 1535 1157 1176 NA 1.65 64 908 918 1584 1185 1205 0.9784 1.51 65 931 945 1621 1214 1235 0.9347 5.41 66 953 964 1664 1242 1265 0.8515 120.93 68 1125 1026 1779 1325 1349 NA 178.04 70 1268 1106 1928 1441 1463 0.7921 26.32 72 1412 1186 2077 1555 1579 0.7938 16.8 74 1555 1271 2222 1669 1692 NA 76.67 76 1699 1348 2355 1778 1804 NA 95.4 77.5 1806 1421 2449 1867 1890 0.8458 109.15 78.5 1878 1464 2519 1925 1947 NA 118.43 81 2057 1581 2681 2070 2090 NA 32.73 83 2200 1671 2817 2188 2205 NA 66.33 84.5 2308 1738 2926 2274 2293 NA 0 86.5 2451 1833 3055 2392 2410 NA 23.88 89 2631 1962 3209 2539 2555 0.8528 2.84 91.5 2810 2084 3368 2685 2699 1.228 10.91 93 2917 2159 3459 2770 2785 1.0253 15.94 95 3061 2260 3575 2883 2897 1.2712 75.49 97 3204 2362 3693 3000 3012 NA 5.84 99 3348 2467 3813 3116 3127 NA 1.81 101 3491 2573 3941 3232 3243 NA 3.38 102.5 3599 2649 4039 3318 3330 0.8024 37.04 105 3778 2775 4179 3464 3474 NA 0 107 3921 2887 4295 3580 3588 NA 7.08 110 4136 3045 4480 3756 3762 NA 0 113 4351 3213 4641 3929 3934 0.7693 6.77 117 4638 3430 4864 4160 4164 NA 0 120 4853 3595 5044 4337 4338 NA 5.67 123.5 5104 3797 5230 4542 4541 NA 12.74 125 5212 3878 5314 4629 4626 NA 3 130 5570 4148 5592 4920 4911 0.9594 2.02 134 5857 4377 5804 5153 5141 NA 33.83 138 6144 4598 5999 5389 5367 NA 2.16 139 6216 4661 6043 5446 5424 NA 375.33 140 6287 4708 6101 5503 5481 NA 1204.71 141 6359 4756 6155 5552 5530 NA 1181.89 142 6431 4799 6222 5599 5578 NA 3194.07 144 6574 4885 6348 5692 5673 NA 3066.67 146.5 6753 5001 6479 5810 5792 NA 453.98 150 7004 5153 6681 5972 5960 NA 1110.86 156 7721 5299 6945 6150 6146 NA 434.6