# Comparison of published versus recalibrated age models for Kau Bay, Indonesia #----------------------------------------------------------------------- # 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/dixon2017kaubay.txt # Description: NOAA location of the template # # Original_Source_URL: https://www.ncdc.noaa.gov/cdo/f?p=519:1:0::::P1_STUDY_ID:8676 # Description: # # Archive: Sediment d15N # # 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 Kau Bay, Indonesia #--------------------------------------- # 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: Langton, SJ; Linsley BK; Robinson, RS; Rosenthal, Y; Oppo, DW; Eglinton, TI; Howe, SS; Djajadihardja, YS; Syamsudin, F # Published_Date_or_Year: 2008 # Published_Title: 3500 year record of centennial-scale climate variability from the Western Pacific Warm Pool # Journal_Name: Geology # Volume: 36 # Edition: # Issue: 10 # Pages: 795-798 # Report Number: # DOI: 10.1130/g24926a.1 # Online_Resource: # Full_Citation: Langton, S. J., Linsley, B. K., Robinson, R. S., Rosenthal, Y., Oppo, D. W., Eglinton, T. I., Howe, S. S., Djajadihardja, Y. S. & Syamsudin, F. 2008. 3500 yr record of centennial-scale climate variability from the Western Pacific Warm Pool. Geology, 36, 795-798. # Abstract: We use geochemical data from a sediment core in the shallow-silled and intermittently dysoxic Kau Bay in Halmahera (Indonesia, lat 1 degrees N, long 127.5 degrees E) to reconstruct century-scale climate variability within the Western Pacific Warm Pool over the past similar to 3500 yr. Downcore variations in bulk sedimentary delta N-15 appear to reflect century-scale variability in basin ventilation, attributed to changes in oceanographic conditions related to century-scale fluctuations in El Nino Southern Oscillation (ENSO). We infer an increase in century-scale El Nino activity beginning ca. 1700 yr B.P. with peaks in El Nino activity ca. 1500 yr B.P., 1150 yr B.P., and ca. 700 yr B.P. The Kau Bay results suggest that there was diminished ENSO amplitude or frequency, or a departure from El Nino-like conditions during the Medieval Warm Period, and distinctive, but steadily decreasing, El Nino activity during and after the Little Ice Age. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: # Grant: #--------------------------------------- # Site Information # Site_Name: Kau Bay # Location: # Country: # Northernmost_Latitude: 1 # Southernmost_Latitude: 1 # Easternmost_Longitude: 127.5 # Westernmost_Longitude: 127.5 # Elevation: -377 #--------------------------------------- # Data_Collection # Collection_Name: 102GGC (gravity core) # First_Year: 3385 # Last_Year: 176 YBP # Time_Unit: years # Core_Length: 4.25 # Notes: #--------------------------------------- # Chronology_Information # Chronology: # 300 year reservoir correction applied to all dates; Calibrated using Fairbanks(2005) calibration curve # Lab ID OS-57842 OS-53225 OS-50536 OS-57841 OS-53236 OS-53237 OS-53238 OS-57847 OS-50537 # Dated material pteropod Creseis acicula pteropod Creseis acicula pteropod Creseis acicula pteropod Creseis acicula pteropod Creseis acicula pteropod Creseis acicula pteropod Creseis acicula pteropod Creseis acicula pteropod Creseis acicula # depth_bot (mm) NaN NaN NaN NaN NaN NaN NaN NaN NaN # depth_top (mm) 20 40 72 153 200 264 312 361 424 # age (bp) NaN NaN NaN NaN NaN NaN NaN NaN NaN # age14C (bp) 690 805 1130 1520 1790 2120 2400 2600 3460 # age_error (years) 30 35 40 30 40 35 30 30 35 # calibrated age (cal BP) NaN NaN NaN NaN NaN NaN NaN NaN NaN # 2-sigma error of cal age (years) NaN NaN NaN NaN NaN NaN NaN NaN NaN # cal_age_range_old (bp) NaN NaN NaN NaN NaN NaN NaN NaN NaN # cal_age_range_young (2_s) 333 528 728 1157 1372 1752 2076 2334 2285 # #--------------------------------------- # 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,NA,cm,NA,NA,NA,NA,N ## PublishedAge_YBP ,Ages from original record publication,NA,NA,years before present (present=1950CE),NA,NA,NA,NA,N ## BACON0.05CI ,5% confidence interval age as calculated in BACON age modelling software,NA,NA,years before present (present=1950CE),NA,NA,NA,NA,N ## BACON0.95CI ,95% confidence interval age as calculated in BACON age modelling software,NA,NA,years before present (present=1950CE),NA,NA,NA,NA,N ## BACONmedian ,median sample age as calculated in BACON age modelling software,NA,NA,years before present (present=1950CE),NA,NA,NA,NA,N ## BACONwmean ,weighted mean age as calculated in BACON age modelling software,NA,NA,years before present (present=1950CE),NA,NA,NA,NA,N ## d15N ,d15N of bulk sediment,Sediment (<63um),± 0.25‰,per mille (‰) deviations relative to N in air,Boreal Winter,Sediment (<63um),,Elemental analyzer,N ## C/N ,Carbon to Nitrogen ratio,Sediment (<63um),,per mille (‰) (VSMOW),Boreal Winter,Sediment (<63um),,,N ## d13Cacid ,d13C of terrestrial plant waxes,Sediment,,per mille (‰) (VSMOW),Boreal Winter,Sediment,Used to determine possible terrestrial influence on d15N,,N #------------------------ # Data # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Value: N/A d15N Depth PublishedAge_YBP BACON0.05CI BACON0.95CI BACONmedian BACONwmean d15N C/N d13Cacid 0 110 -16 319 182 176 3.28 11.7 -21.75 8 173 76 357 241 236 3.77 N/A N/A 16 244 196 395 300 301 3.76 N/A N/A 24 319 277 436 355 357 3.99 N/A N/A 32 397 316 476 404 403 4.47 N/A N/A 40 475 367 516 452 450 5.09 N/A N/A 48 525 414 600 501 504 5.06 13.2 -22.06 56 575 453 658 555 557 5.08 N/A N/A 64 625 509 704 611 610 5.59 N/A N/A 72 675 566 749 666 665 4.75 N/A N/A 80 717 601 810 706 708 4.66 N/A N/A 88 760 637 861 744 748 3.76 N/A N/A 96 802 673 913 788 791 4.13 N/A N/A 104 844 707 960 830 832 3.66 N/A N/A 112 887 739 1005 870 873 3.68 N/A N/A 120 929 779 1044 913 914 3.6 N/A N/A 128 972 825 1083 955 956 4.08 N/A N/A 130 NA 838.7 1087.8 965.1 966.2 NA 14 -22.32 136 1014 871 1112 997 997 4.08 N/A N/A 144 1056 922 1149 1039 1039 4.65 N/A N/A 152 1099 976 1178 1081 1080 4.02 N/A N/A 160 1136 1019 1215 1123 1122 3.97 N/A N/A 168 1173 1057 1268 1165 1165 4.37 N/A N/A 176 1209 1099 1323 1209 1210 4.24 N/A N/A 184 1246 1139 1370 1254 1255 4.11 N/A N/A 190 NA 1180.8 1397.8 1285.7 1287 NA 13.9 -21.66 192 1282 1190 1412 1296 1298 4.06 N/A N/A 200 1319 1251 1459 1336 1341 3.97 N/A N/A 208 1367 1297 1502 1382 1387 3.69 N/A N/A 216 1414 1326 1563 1428 1434 3.63 N/A N/A 224 1462 1362 1614 1477 1481 3.61 N/A N/A 232 1509 1401 1670 1527 1530 3.81 N/A N/A 240 1557 1444 1718 1576 1578 3.74 N/A N/A 248 1604 1492 1758 1625 1626 3.19 N/A N/A 256 1652 1541 1797 1671 1673 2.74 N/A N/A 264 1699 1605 1832 1718 1720 2.74 N/A N/A 272 1753 1655 1880 1767 1768 2.56 N/A N/A 280 1807 1697 1948 1818 1820 2.48 N/A N/A 288 1861 1739 2008 1869 1871 2.68 N/A N/A 296 1915 1782 2055 1920 1923 2.16 N/A N/A 304 1969 1840 2102 1973 1974 2.72 N/A N/A 312 2023 1907 2145 2025 2026 2.3 N/A N/A 320 2065 1974 2193 2076 2080 2.65 N/A N/A 328 2107 2014 2283 2129 2134 2.61 N/A N/A 336 2149 2059 2360 2180 2188 2.45 N/A N/A 344 2191 2100 2428 2229 2240 2.53 N/A N/A 352 2234 2149 2506 2279 2294 2.5 N/A N/A 360 2276 2203 2579 2326 2347 2.46 15.3 -22.19 368 2398 2269 2648 2370 2402 2.37 N/A N/A 376 2531 2329 2783 2495 2514 2.42 N/A N/A 384 2665 2393 2906 2610 2624 2.68 N/A N/A 392 2798 2471 3024 2719 2731 2.43 N/A N/A 400 2932 2558 3141 2845 2847 2.84 N/A N/A 408 3065 2654 3245 2962 2959 2.61 N/A N/A 416 3199 2756 3328 3085 3075 2.89 N/A N/A 418 3232 N/A N/A N/A N/A NA 15.6 -21.27 424 3332 2864 3399 3207 3190 4.1 N/A N/A