# Lake 30, Kiritimati Geochemistry, d18O, d13C and dD Data since 700 CE #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # Template Version 4.0 # Encoding: UTF-8 # NOTE: Please cite original publication, online resource and date accessed when using this data. # If there is no publication information, please cite Investigator, study title, NOAA Landing Page URL, and date accessed. # # Description/Documentation lines begin with '#' followed by a space # Data lines have no '#' # # NOAA_Landing_Page: https://www.ncei.noaa.gov/access/paleo-search/study/33594 # Landing_Page_Description: NOAA Landing Page of this file's parent study, which includes all study metadata. # # Study_Level_JSON_Metadata: https://www.ncei.noaa.gov/pub/data/metadata/published/paleo/json/noaa-lake-33594.json # Study_Level_JSON_Description: JSON metadata of this data file's parent study, which includes all study metadata. # # Data_Type: Paleolimnology # # Dataset_DOI: 10.25921/2nqb-cp11 # # Science_Keywords: Hydrogen Isotopes, oxygen isotopes, minerology, age control #--------------------------------------- # Resource_Links # # Data_Download_Resource: https://www.ncei.noaa.gov/pub/data/paleo/paleolimnology/pacific/wyman2021/wyman2021-lake30-s-ca.txt # Data_Download_Description: NOAA Template File; K17-30A S/Ca Data # #--------------------------------------- # Contribution_Date # Date: 2021-06-24 #--------------------------------------- # File_Last_Modified_Date # Date: 2025-05-16 #--------------------------------------- # Title # Study_Name: Lake 30, Kiritimati Geochemistry, d18O, d13C and dD Data since 700 CE #--------------------------------------- # Investigators # Investigators: Wyman, D.; Conroy, J.; Osburn, M.; Atwood, A. #--------------------------------------- # Description_Notes_and_Keywords # Description: # Provided Keywords: last millennium, central Pacific #--------------------------------------- # Publication # Authors: Wyman, D.A.,J.L. Conroy, M.R. Osburn, A.R. Atwood # Published_Date_or_Year: 2021-07-01 # Published_Title: Coeval drying across the central tropical Pacific over the last millennium # Journal_Name: Paleoceanography and Paleoclimatology # Volume: 36 # Edition: # Issue: 7 # Pages: # Report_Number: e2021PA004311 # DOI: 10.1029/2021PA004311 # Online_Resource: # Full_Citation: # Abstract: Hydroclimatic variability in the tropical Pacific reflects large-scale ocean-atmosphere processes that imprint on global climate, but tropical Pacific hydroclimate variability over the last millennium remains uncertain. Here we present a multi-proxy reconstruction from a lacustrine sediment record on Kiritimati Atoll that spans the last millennium. A lake salinity reconstruction from the δ2H values of total lipid extracts, combined with changes in sediment mineralogy and the stable isotopic composition of inorganic carbonates, indicate the presence of several distinct hydrologic regimes on Kiritimati, including a period of persistent aridity from 960–1030 CE, shorter episodes of aridity from 1030–1370 CE, and extreme aridity throughout the latter half of the last millennium, from 1370–1970 CE, that drove complete evaporation of the lake. A period of wetter, variable conditions defines recent decades. Compound-specific lipid biomarker δ2H values indicate that shifts in microbial community structure occurred in the past, from a community dominated by photoautotrophic and chemoautotrophic organisms in more arid periods to a more metabolically diverse community in the recent period. Comparison of this record with nearby sediment records from Washington Island reveals a similar pattern of aridity through the last millennium, followed by wetter conditions in the modern period. These coherent changes in hydroclimate in the central Pacific are inconsistent with a migration of the Pacific Intertropical Convergence Zone within these latitudes. Rather, past aridity was caused by reduced El Niño-Southern Oscillation variability, observed through the low-pass filter of lacustrine records, or by multidecadal to multi-century strengthening of the Pacific Walker Circulation. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: US National Science Foundation # Grant: EAR 1602590 #--------------------------------------- # Site_Information # Site_Name: Lake 30, Kiritimati # Location: Kiribati # Northernmost_Latitude: 1.9 # Southernmost_Latitude: 1.9 # Easternmost_Longitude: -157.4 # Westernmost_Longitude: -157.4 # Elevation_m: #--------------------------------------- # Data_Collection # Collection_Name: K17-30A S/Ca Wyman2021 # First_Year: 714 # Last_Year: 2014 # Time_Unit: year Common Era # Core_Length_m: 0.91 # Parameter_Keywords: geochemistry # Notes: #--------------------------------------- # Chronology_Information # Chronology: Radiocarbon # Chronology_Download_Resource: https://www.ncei.noaa.gov/pub/data/paleo/templates/noaa-wds-paleo-14c-terms.csv # Chronology_Download_Description: Radiocarbon terms and definitions. # Chronology_Notes: # Rejection_Rationale: # Reservoir_Method: A reservoir effect of 58 (±50) years was determined from the core top sample and applied to all measurements # Calibration_Method: Modern dates were calibrated using CALIBomb with the IntCal13 pre-bomb calibration curve (Reimer et al., 2013) and the NHZ3 calibration data set (Hua et al., 2013). # Age_Model_Method: Bacon 2.3.7 (Blaauw & Christen, 2011) # Missing_Values: # Chronology_Table: # lab_name lab_code core_id material_dated age_14C_BP1950 age_14C_1s_yr age_calib_BP1950 age_calib_1s_yr depth_raw_cm depth_cm calib_curve res_age_yr res_age_uncert_yr # Illinois Geological Survey/University of California-Irvine ISGSA3470 K614-1A-1P Organics (Core Top) NA NA -64 1 0 1 none 0 0 # Illinois Geological Survey/University of California-Irvine ISGSA4702 K614-1B-1P Organics NA NA -56 5 6 16.9398686503301 none 0 0 # Direct AMS D-AMS 030330 K17-30A Organics NA NA -55 5 15 15 none 0 0 # Illinois Geological Survey/University of California-Irvine ISGSA3591 K614-1B-1P Microbial Mat 660 15 NA NA 27.5 29.8127593305307 IntCal13 58 50 # Illinois Geological Survey/University of California-Irvine ISGSA4703 K614-2C-1L Microbial Mat 665 20 NA NA 5.4 30.7 IntCal13 58 50 # Illinois Geological Survey/University of California-Irvine ISGSA4704 K17-30A Microbial Mat 675 20 NA NA 26 26.1 IntCal13 58 50 # Illinois Geological Survey/University of California-Irvine ISGSA3432 K614-1A-1P Seed 835 15 NA NA 45.5 41.5502907868651 IntCal13 0 0 # Illinois Geological Survey/University of California-Irvine ISGSA4705 K17-30A Microbial Mat 845 20 NA NA 44 43.6 IntCal13 58 50 # Illinois Geological Survey/University of California-Irvine ISGSA3590 K614-2C-1L Microbial Mat 850 15 NA NA 16 43.4375 IntCal13 58 50 # Illinois Geological Survey/University of California-Irvine ISGSA4394 K17-30A Microbial Mat 980 15 NA NA 57 57 IntCal13 58 50 # Illinois Geological Survey/University of California-Irvine ISGSA3506 K614-2D-1B Microbial Mat 1210 15 NA NA 23 73.794 IntCal13 58 50 # Illinois Geological Survey/University of California-Irvine ISGSA4395 K17-30A Microbial Mat 1305 20 NA NA 85 85 IntCal13 58 50 # Direct AMS D-AMS 030331 K17-30A Microbial Mat 1307 20 NA NA 73 73 IntCal13 58 50 #--------------------------------------- # Variables # PaST_Thesaurus_Download_Resource: https://www.ncei.noaa.gov/access/paleo-search/skos/past-thesaurus.rdf # PaST_Thesaurus_Download_Description: Paleoenvironmental Standard Terms (PaST) Thesaurus terms, definitions, and relationships in SKOS format. # # Data variables follow that are preceded by "##" in columns one and two. # Variables list, one per line, shortname-tab-var components: what, material, error, units, seasonality, data type, detail, method, C or N for Character or Numeric data) # ## depth_cm depth,,,centimeter,,paleolimnology,,,N, ## age_AD age,,,year Common Era,,paleolimnology,,,N, ## S/Ca sulfur/calcium,sediment,,dimensionless,,paleolimnology,,X-ray fluorescence spectroscopy,N, #------------------------ # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing_Values: NaN depth_cm age_AD S/Ca 1 2014 0.007 2 2013 0.005 3 2011 0.005 4 2009 0.005 5 2008 0.004 6 2006 0.004 7 2004 0.004 8 2003 0.004 9 2001 0.003 10 1999 0.003 11 1998 0.004 12 1996 0.005 13 1994 0.005 14 1993 0.005 15 1991 0.006 16 1988 0.006 17 1988 0.006 18 1986 0.006 19 1983 0.005 20 1983 0.005 21 1981 0.006 22 1978 0.005 23 1978 0.005 24 1976 0.006 25 1375 0.005 26 1367 0.011 27 1359 0.021 28 1351 0.018 29 1343 0.008 30 1335 0.004 31 1326 0.005 32 1317 0.006 33 1308 0.004 34 1298 0.004 35 1289 0.007 36 1280 0.049 37 1271 0.033 38 1261 0.043 39 1252 0.021 40 1243 0.052 41 1235 0.016 42 1226 0.006 43 1218 0.005 44 1210 0.008 45 1202 0.039 46 1192 0.035 47 1182 0.012 48 1173 0.010 49 1163 0.015 50 1153 0.021 51 1144 0.012 52 1134 0.015 53 1124 0.023 54 1114 0.020 55 1104 0.018 56 1093 0.006 57 1083 0.007 58 1072 0.007 59 1061 0.022 60 1051 0.026 61 1038 0.049 62 1025 0.044 63 1012 0.046 64 1000 0.045 65 987 0.058 66 974 0.032 67 961 0.014 68 948 0.006 69 935 0.006 70 922 0.006 71 909 0.004 72 896 0.007 73 883 0.007 74 871 0.006 75 858 0.005 76 848 0.006 77 838 0.005 78 827 0.005 79 817 0.005 80 807 0.005 81 798 0.005 82 789 0.007 83 780 0.006 84 771 0.005 85 762 0.005 86 753 0.005 87 743 0.005 88 734 0.005 89 725 0.004 90 715 0.005