# 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/Gall.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/Gall.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 2.7 m; hence only large-scale trends are 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: Gall Lake # Location: North America>Canada>Ontario # Country: Canada # Northernmost_Latitude: 50.23 # Southernmost_Latitude: 50.23 # Easternmost_Longitude: -91.45 # Westernmost_Longitude: -91.45 # Elevation: 365 m #------------------ # Data_Collection # Collection_Name: Gall.Laird.2012 # Earliest_Year: 1933.0 # Most_Recent_Year: -59.0 # 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 2009 -59 12.731 2004 -54 9.963 1999 -49 12.158 1994 -44 11.535 1988 -38 12.499 1982 -32 10.834 1975 -25 11.906 1967 -17 12.482 1959 -9 11.683 1951 -1 12.001 1942 8 11.1 1932 18 12.517 1922 28 11.685 1910 40 11.435 1896 54 11.864 1881 69 11.534 1866 84 10.761 1850 100 11.027 1833 117 10.472 1816 134 11.365 1797 153 11.679 1778 172 10.664 1759 191 10.763 1739 211 12.058 1718 232 11.869 1697 253 11.024 1675 275 10.709 1653 297 11.464 1630 320 10.816 1607 343 10.161 1584 366 10.371 1560 390 10.448 1536 414 10.632 1512 438 10.491 1487 463 11.353 1463 487 10.154 1438 512 9.837 1413 537 8.789 1387 563 10.444 1362 588 10.943 1337 613 11.053 1312 638 10.825 1286 664 9.513 1261 689 10.481 1236 714 9.762 1211 739 9.485 1186 764 9.931 1161 789 9.681 1137 813 9.682 1113 837 8.946 1089 861 9.39 1065 885 10.197 1042 908 9.419 1019 931 10.572 996 954 8.643 974 976 9.452 953 997 10.173 932 1018 10.02 911 1039 10.045 891 1059 10.017 871 1079 10.53 851 1099 10.424 832 1118 10.27 812 1138 10.37 792 1158 10.784 772 1178 9.896 752 1198 10.247 732 1218 10.383 712 1238 10.413 693 1257 12.145 673 1277 11.124 653 1297 11.399 633 1317 11.241 613 1337 10.125 593 1357 10.714 573 1377 11.236 554 1396 11.437 534 1416 10.392 514 1436 10.699 494 1456 11.524 474 1476 11.312 454 1496 10.908 434 1516 11.068 415 1535 11.086 395 1555 10.556 375 1575 10.903 355 1595 11.95 335 1615 9.475 315 1635 11.619 295 1655 10.137 276 1674 12.261 256 1694 11.449 236 1714 11.104 216 1734 10.18 196 1754 11.471 176 1774 11.802 156 1794 10.51 137 1813 10.786 117 1833 11.146 97 1853 10.804 77 1873 10.773 57 1893 10.421 37 1913 9.478 17 1933 9.596