# 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/Meekin.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/Meekin.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 transfer function is 1.3 m; hence increase after 1800 likely robust, smaller shifts may not be #------------------ # 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: Meekin Lake # Location: North America>Canada>Ontario # Country: Canada # Northernmost_Latitude: 49.82 # Southernmost_Latitude: 49.82 # Easternmost_Longitude: -94.77 # Westernmost_Longitude: -94.77 # Elevation: 353 m #------------------ # Data_Collection # Collection_Name: Meekin.Laird.2012 # Earliest_Year: 1931.0 # Most_Recent_Year: -59.5 # 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 2009.5 -59.5 12.15 2006.5 -56.5 11.504 2003.3 -53.3 11.838 1999.1 -49.1 10.848 1994.7 -44.7 10.647 1989.7 -39.7 11.119 1983.9 -33.9 10.381 1975.2 -25.2 10.821 1965.9 -15.9 9.647 1960 -10 11.505 1956 -6 11.372 1952 -2 10.605 1948 2 9.548 1944 6 11.342 1940 10 9.518 1936 14 9.128 1932 18 9.561 1928 22 9.463 1924 26 9.726 1920 30 9.435 1916 34 9.419 1912 38 8.736 1908 42 8.986 1904 46 8.868 1900 50 9.078 1896 54 8.054 1892 58 8.498 1888 62 8.385 1884 66 8.973 1880 70 7.682 1861 89 8.008 1842 108 7.872 1823 127 8.992 1804 146 7.794 1785 165 7.374 1766 184 7.024 1747 203 6.797 1728 222 6.983 1709 241 7.759 1690 260 7.387 1671 279 6.456 1652 298 6.813 1633 317 7.609 1614 336 7.108 1595 355 7.411 1576 374 7.37 1557 393 7.048 1538 412 7.484 1519 431 7.624 1500 450 7.243 1481 469 7.352 1462 488 7.632 1443 507 7.45 1424 526 7.626 1405 545 8.117 1386 564 7.328 1367 583 7.828 1348 602 7.225 1329 621 7.37 1310 640 7.795 1291 659 7.738 1272 678 7.223 1253 697 7.796 1234 716 7.523 1215 735 7.775 1196 754 7.241 1177 773 7.451 1158 792 6.926 1139 811 7.173 1120 830 7.441 1103.75 846.25 6.761 1087.5 862.5 6.792 1071.25 878.75 7.064 1055 895 6.559 1038.75 911.25 6.666 1022.5 927.5 6.461 1006.25 943.75 6.486 990 960 6.816 973.75 976.25 6.98 957.5 992.5 6.814 941.25 1008.75 6.477 925 1025 6.823 908.75 1041.25 6.883 892.5 1057.5 6.813 876.25 1073.75 7.814 860 1090 7.545 843.75 1106.25 7.37 827.5 1122.5 7.614 811.25 1138.75 7.554 795 1155 7.161 778.75 1171.25 7.412 762.5 1187.5 7.631 746.25 1203.75 6.94 730 1220 7.634 713.75 1236.25 7.183 697.5 1252.5 8.308 681.25 1268.75 6.667 665 1285 7.106 648.75 1301.25 7.762 632.5 1317.5 7.079 616.25 1333.75 7.083 600 1350 7.777 583.75 1366.25 7.317 567.5 1382.5 6.668 551.25 1398.75 8.337 535 1415 8.239 518.75 1431.25 8.379 502.5 1447.5 8.952 486.25 1463.75 8.601 470 1480 8.069 461.5 1488.5 8.313 453 1497 8.62 445 1505 7.876 437 1513 8.063 429 1521 7.977 421 1529 7.968 413 1537 8.184 405 1545 8.282 397 1553 7.831 389 1561 7.618 381 1569 7.829 373 1577 7.306 365 1585 6.885 357 1593 7.54 349 1601 7.627 341 1609 7.283 333 1617 7.781 325 1625 7.694 317 1633 7.547 309 1641 7.494 301 1649 7.457 293 1657 7.6 285 1665 7.525 277 1673 8.042 269 1681 7.198 261 1689 8.385 253 1697 7.533 245 1705 7.226 237 1713 7.677 229 1721 7.871 221 1729 7.078 213 1737 8.135 196 1754 7.289 179 1771 6.961 171 1779 8.243 163 1787 7.952 155 1795 7.217 147 1803 7.688 139 1811 7.045 131 1819 7.203 123 1827 7.436 115 1835 7.355 107 1843 6.452 99 1851 7.69 91 1859 7.154 83 1867 8.643 75 1875 7.312 67 1883 8.36 59 1891 8.156 51 1899 8.41 43 1907 7.947 35 1915 7.834 27 1923 7.606 19 1931 7.856