# 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/LittleRaleigh.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/LittleRaleigh.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: RMSEP of diatom-inferred depth is 1.2 m; hence only directional shift at ca 1000 yr BP is likely robust #------------------ # 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: Little Raleigh # Location: North America>Canada>Ontario # Country: Canada # Northernmost_Latitude: 49.45 # Southernmost_Latitude: 49.45 # Easternmost_Longitude: -91.89 # Westernmost_Longitude: -91.89 # Elevation: 457 m #------------------ # Data_Collection # Collection_Name: LittleRaleigh.Laird.2012 # Earliest_Year: 1952.339 # Most_Recent_Year: -60.0 # 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: nan # age_CE age_calBP lake_depth_m 2010 -60 14.262 2008.75 -58.75 12.851 2007.5 -57.5 13.763 2006.25 -56.25 13.018 2004.95 -54.95 13.093 1999.37 -49.37 12.761 1993.83 -43.83 13.023 1985.99 -35.99 12.819 1978.16 -28.16 12.553 1969.56 -19.56 12.836 1960.95 -10.95 13.39 1948.32 1.68 12.763 1935.7 14.3 12.721 1915.49 34.51 12.249 1895.29 54.71 12.305 1876.92 73.08 12.038 1858.55 91.45 11.385 1834.84 115.16 11.361 1817.83 132.17 12.113 1800.83 149.17 12.781 1783.83 166.17 12.604 1766.83 183.17 11.688 1749.83 200.17 12.413 1732.83 217.17 11.845 1715.83 234.17 10.671 1698.82 251.18 10.882 1681.82 268.18 11.453 1664.82 285.18 12.436 1647.82 302.18 11.801 1630.82 319.18 11.581 1613.82 336.18 13.413 1596.81 353.19 12.56 1579.81 370.19 12.413 1562.81 387.19 11.884 1545.81 404.19 11.444 1528.81 421.19 11.684 1511.81 438.19 12.734 1494.8 455.2 12.487 1477.8 472.2 13.533 1460.8 489.2 12.063 1443.8 506.2 12.762 1426.8 523.2 12.369 1409.8 540.2 12.409 1392.79 557.21 12.407 1375.79 574.21 12.6 1358.79 591.21 13.411 1341.79 608.21 12.124 1324.79 625.21 13.451 1307.79 642.21 13.04 1290.78 659.22 12.028 1273.78 676.22 10.943 1256.78 693.22 11.006 1239.78 710.22 11.51 1222.78 727.22 11.153 1205.78 744.22 10.817 1188.77 761.23 10.999 1171.77 778.23 10.979 1154.77 795.23 10.365 1137.77 812.23 11.316 1120.77 829.23 12.114 1103.77 846.23 11.869 1086.76 863.24 12.879 1069.76 880.24 12.042 1052.76 897.24 12.031 1035.76 914.24 12.055 1018.76 931.24 12.584 1001.76 948.24 12.58 984.755 965.245 11.764 967.753 982.247 12.571 950.752 999.248 13.379 933.75 1016.25 14.104 916.749 1033.251 13.834 899.747 1050.253 13.791 882.745 1067.255 13.686 865.744 1084.256 13.369 848.742 1101.258 14.081 831.74 1118.26 13.577 814.739 1135.261 14.228 797.737 1152.263 13.357 780.736 1169.264 14.111 763.734 1186.266 12.883 746.732 1203.268 13.918 729.731 1220.269 12.794 712.729 1237.271 13.886 695.727 1254.273 13.842 678.726 1271.274 13.982 661.724 1288.276 13.149 644.722 1305.278 14.17 627.721 1322.279 12.753 610.719 1339.281 14.043 593.718 1356.282 14.872 576.716 1373.284 13.635 559.714 1390.286 13.153 542.713 1407.287 13.917 525.711 1424.289 14.147 508.709 1441.291 14.045 491.708 1458.292 13.716 474.706 1475.294 13.849 457.705 1492.295 15.591 440.703 1509.297 14.502 423.701 1526.299 14.897 406.7 1543.3 13.952 389.698 1560.302 14.95 372.696 1577.304 15.149 355.695 1594.305 15.33 338.693 1611.307 14.574 321.692 1628.308 14.653 304.69 1645.31 15.604 287.688 1662.312 15.083 270.687 1679.313 15.243 253.685 1696.315 15.116 236.683 1713.317 14.628 219.682 1730.318 14.712 202.68 1747.32 14.511 185.678 1764.322 15.067 168.677 1781.323 14.332 151.675 1798.325 15.276 134.674 1815.326 15.503 117.672 1832.328 16.416 100.67 1849.33 14.733 83.669 1866.331 16.098 66.667 1883.333 15.641 49.665 1900.335 15.866 32.664 1917.336 15.098 15.662 1934.338 16.02 -2.339 1952.339 15.318