# Northwest Ontario 2,000 Year Lake Depth Data #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program # National Centers for Environmental Information (NCEI) #----------------------------------------------------------------------- # Template Version 3.0 # Encoding: UTF-8 # NOTE: Please cite Publication, and Online_Resource and date accessed when using these data. # If there is no publication information, please cite Investigators, Title, and Online_Resource and date accessed. # # Online_Resource: https://www.ncdc.noaa.gov/paleo/study/23094 # Description: NOAA Landing Page # # Online_Resource: https://www1.ncdc.noaa.gov/pub/data/paleo/pages2k/NAm2kHydro-2017/noaa-templates/data-version-1.0.0/ELA239.Laird.2012.txt # Online_Resource_Description: This file. NOAA WDS Paleo formatted metadata and data for version 1.0.0 of this dataset. # # Online_Resource: https://www1.ncdc.noaa.gov/pub/data/paleo/pages2k/NAm2kHydro-2017/data-version-1.0.0/ELA239.Laird.2012.lpd # Online_Resource_Description: Linked Paleo Data (LiPD) formatted file containing the same metadata and data as this file, for version 1.0.0 of this dataset. # # Original_Source_URL: this study # Description/Documentation lines begin with # # Data lines have no # # # Archive: Lake Level Reconstruction # Parameter_Keywords: # Dataset_DOI: # #------------------ # Contribution_Date # Date: 2017-11-15 #------------------ # File_Last_Modified_Date # Modified_Date: 2017-11-15 #------------------ # Title # Study_Name: Northwest Ontario 2,000 Year Lake Depth Data #------------------ # Investigators # Investigators: Laird, K.R.; Haig, H.A.; Ma, S.; Kingsbury, M.V.; Brown, T.A.; Lewis, C.F.M.; Oglesby, R.J.; Cumming, B.F. #------------------ # Description_Notes_and_Keywords # Description: Note added by NAm2k hydroclimate authors: Large directional shifts (ca 300, 1470 yr BP) probably robust; smaller high-frequency changes in depth likely outside precision of the model (explicit error estimates not presented in paper) #------------------ # Publication # Authors: Kathleen R. Laird, Heather A. Haig, Susan Ma, Melanie V. Kingsbury, Thomas A. Brown, C.F. Michael Lewis, Robert J. Oglesby and Brian F. Cumming # Published_Date_or_Year: 2012 # Published_Title: Expanded spatial extent of the Medieval Climate Anomaly revealed in lake-sediment records across the boreal region in northwest Ontario # Journal_Name: Global Change Biology # Volume: 18 # Edition: # Issue: 9 # Pages: 2869-2881 # Report: # DOI: 10.1111/j.1365-2486.2012.02740.x # Online_Resource: http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2486.2012.02740.x/full # Full_Citation: # Abstract: Multi-decadal to centennial-scale shifts in effective moisture over the past two millennia are inferred from sedimentary records from six lakes spanning a ~250 km region in northwest Ontario. This is the first regional application of a technique developed to reconstruct drought from drainage lakes (open lakes with surface outlets). This regional network of proxy drought records is based on individual within-lake calibration models developed using diatom assemblages collected from surface sediments across a water-depth gradient. Analysis of diatom assemblages from sediment cores collected close to the near-shore ecological boundary between benthic and planktonic diatom taxa indicated this boundary shifted over time in all lakes. These shifts are largely dependent on climate-driven influences, and can provide a sensitive record of past drought. Our lake-sediment records indicate two periods of synchronous signals, suggesting a common large-scale climate forcing. The first is a period of prolonged aridity during the Medieval Climate Anomaly (MCA, c. 900-1400 CE). Documentation of aridity across this region expands the known spatial extent of the MCA megadrought into a region that historically has not experienced extreme droughts such as those in central and western north America. The second synchronous period is the recent signal of the past ~100 years, which indicates a change to higher effective moisture that may be related to anthropogenic forcing on climate. This approach has the potential to fill regional gaps, where many previous paleo-lake depth methods (based on deeper centrally located cores) were relatively insensitive. By filling regional gaps, a better understanding of past spatial patterns in drought can be used to assess the sensitivity and realism of climate model projections of future climate change. This type of data is especially important for validating high spatial resolution, regional climate models. #------------------ # Funding_Agency # Funding_Agency_Name: NSERC # Grant: #------------------ # Site_Information # Site_Name: ELA Lake 239 # Location: North America>Canada>Ontario # Country: Canada # Northernmost_Latitude: 49.67 # Southernmost_Latitude: 49.67 # Easternmost_Longitude: -93.73 # Westernmost_Longitude: -93.73 # Elevation: 386 m #------------------ # Data_Collection # Collection_Name: ELA239.Laird.2012 # Earliest_Year: 1942.35 # Most_Recent_Year: -54.0 # Time_Unit: Cal. Year BP # Core_Length: # Notes: #------------------ # Chronology: # #------------------ # Variables # # Data variables follow that are preceded by "##" in columns one and two. # Data line variables format: Variables list, one per line, shortname-tab-longname-tab-longname components ( 10 components: what, material, error, units, seasonality, archive, detail, method, C or N for Character or Numeric data, additional_information) # ## age_CE age, , , year CE, , , , ,N, ## age_calBP age, , , calendar years before present, , , , ,N, ## lake_depth_m lake depth, ,,m, , paleolimnology, diatom inferred,within-lake calibration, N, # #------------------ # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header) # Missing_Values: # age_CE age_calBP lake_depth_m 2004 -54 16.509 2001.5 -51.5 16.022 1999 -49 15.684 1996.5 -46.5 16.614 1994 -44 16.643 1991 -41 16.542 1988 -38 12.687 1985 -35 14.391 1982 -32 16.531 1976.5 -26.5 15.524 1971 -21 17.036 1965.5 -15.5 16.649 1960 -10 16.957 1954 -4 15.3 1948 2 15.852 1942 8 17.166 1936 14 16.205 1930 20 16.03 1924 26 14.67 1918 32 18.462 1912 38 15.87 1907.5 42.5 16.669 1903 47 14.403 1898.5 51.5 16.964 1894 56 13.549 1888.5 61.5 15.008 1883 67 13.566 1877.5 72.5 14.164 1872 78 15.368 1866.5 83.5 10.905 1861 89 16.061 1855.5 94.5 16.591 1850 100 15.594 1845.4 104.6 14.932 1840.8 109.2 15.061 1836 114 14.482 1831.4 118.6 15.1 1826.8 123.2 14.643 1822 128 13.383 1804.8 145.2 12.953 1787.6 162.4 15.167 1770.4 179.6 16.702 1753.2 196.8 13.529 1736 214 15.469 1718.8 231.2 15.004 1701.6 248.4 16.259 1684.4 265.6 14.789 1667.2 282.8 14.477 1650 300 17.602 1625.77 324.23 19.767 1601.54 348.46 18.468 1577.31 372.69 19.638 1553.08 396.92 20.232 1528.85 421.15 19.088 1504.62 445.38 19.337 1480.38 469.62 21.485 1456.15 493.85 20.023 1431.92 518.08 18.747 1407.69 542.31 20.046 1383.46 566.54 19.253 1359.23 590.77 18.091 1335 615 20.011 1316.41 633.59 19.54 1297.83 652.17 20.248 1279.24 670.76 19.978 1260.65 689.35 20.086 1242.07 707.93 18.74 1223.48 726.52 18.618 1204.89 745.11 17.724 1186.3 763.7 18.456 1167.72 782.28 16.969 1149.13 800.87 19.262 1130.54 819.46 19.09 1111.96 838.04 15.742 1093.37 856.63 15.844 1074.78 875.22 15.115 1056.2 893.8 16.971 1037.61 912.39 17.542 1019.02 930.98 18.489 1000.43 949.57 18.825 981.85 968.15 19.046 963.26 986.74 16.587 944.67 1005.33 16.849 926.09 1023.91 17.631 907.5 1042.5 18.759 888.91 1061.09 19.401 870.33 1079.67 18.298 851.74 1098.26 17.871 833.15 1116.85 18.871 814.57 1135.43 17.614 795.98 1154.02 19.069 777.39 1172.61 19.247 758.8 1191.2 19.067 740.22 1209.78 19.802 721.63 1228.37 17.926 703.04 1246.96 19.244 684.46 1265.54 18.443 665.87 1284.13 17.837 647.28 1302.72 17.669 628.7 1321.3 19.213 610.11 1339.89 19.63 591.52 1358.48 20.74 572.93 1377.07 19.231 554.35 1395.65 17.465 535.76 1414.24 18.858 517.17 1432.83 17.609 498.59 1451.41 17.955 480 1470 14.839 458.53 1491.47 12.635 437.06 1512.94 14.21 415.59 1534.41 13.091 394.12 1555.88 13.273 372.65 1577.35 13.178 351.18 1598.82 11.692 329.71 1620.29 8.855 308.24 1641.76 11.037 286.76 1663.24 13.577 265.29 1684.71 12.532 243.82 1706.18 15.574 222.35 1727.65 13.192 200.88 1749.12 12.956 179.41 1770.59 13.864 157.94 1792.06 13.731 136.47 1813.53 12.684 115 1835 12.187 93.53 1856.47 13.234 72.06 1877.94 13.537 50.59 1899.41 12.011 29.12 1920.88 13.082 7.65 1942.35 11.788