# 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/Dixie.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/Dixie.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 1.4 m; hence only larger trends likely significant #------------------ # 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: Dixie Lake # Location: North America>Canada>Ontario # Country: Canada # Northernmost_Latitude: 49.83 # Southernmost_Latitude: 49.83 # Easternmost_Longitude: -93.95 # Westernmost_Longitude: -93.95 # Elevation: 398 m #------------------ # Data_Collection # Collection_Name: Dixie.Laird.2012 # Earliest_Year: 1948.38 # Most_Recent_Year: -59.6 # 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 2009.6 -59.6 13.002 2008.26 -58.26 12.748 2007.01 -57.01 12.738 2005.51 -55.51 12.567 2003.84 -53.84 13.163 2001.85 -51.85 12.895 1999.47 -49.47 12.592 1996.85 -46.85 12.155 1993.57 -43.57 11.166 1989.43 -39.43 11.752 1984.22 -34.22 11.503 1979.01 -29.01 11.411 1972.26 -22.26 10.687 1965.51 -15.51 11.268 1956 -6 11.649 1947 3 12.465 1934.98 15.02 11.748 1922.97 27.03 12.414 1910.95 39.05 11.339 1898.93 51.07 12.027 1886.91 63.09 11.315 1874.9 75.1 11.608 1862.88 87.12 11.359 1850.86 99.14 12.388 1838.84 111.16 11.8 1826.83 123.17 11.383 1814.81 135.19 10.701 1802.79 147.21 11.498 1790.78 159.22 11.288 1778.76 171.24 11.271 1766.74 183.26 11.598 1754.72 195.28 12.683 1742.71 207.29 11.523 1730.69 219.31 13.135 1718.67 231.33 12.148 1706.66 243.34 12.934 1694.64 255.36 12.356 1682.62 267.38 13.586 1670.6 279.4 11.793 1658.59 291.41 13.005 1646.57 303.43 12.464 1634.55 315.45 12.47 1622.53 327.47 11.653 1610.52 339.48 12.953 1598.5 351.5 12.433 1586.48 363.52 12.438 1574.47 375.53 12.183 1562.45 387.55 11.545 1550.43 399.57 11.542 1538.41 411.59 10.891 1526.4 423.6 11.898 1514.38 435.62 11.369 1502.36 447.64 10.713 1490.34 459.66 11.249 1478.33 471.67 10.301 1466.31 483.69 11.015 1454.29 495.71 10.622 1442.28 507.72 10.637 1430.26 519.74 9.847 1418.24 531.76 10.169 1406.22 543.78 10.453 1394.21 555.79 11.633 1382.19 567.81 11.342 1370.17 579.83 9.31 1358.16 591.84 9.721 1346.14 603.86 9.963 1334.12 615.88 9.908 1322.1 627.9 9.845 1310.09 639.91 11.102 1298.07 651.93 10.095 1286.05 663.95 10.088 1274.03 675.97 9.858 1262.02 687.98 9.938 1250 700 9.683 1238.81 711.19 10.372 1227.62 722.38 11.037 1216.43 733.57 10.467 1205.24 744.76 10.542 1194.05 755.95 10.351 1182.86 767.14 10.506 1171.67 778.33 10.021 1160.48 789.52 10.293 1149.29 800.71 10.689 1138.1 811.9 10.137 1126.9 823.1 10.032 1115.71 834.29 10.212 1104.52 845.48 10.345 1093.33 856.67 10.783 1082.14 867.86 10.343 1070.95 879.05 10.677 1059.76 890.24 10.793 1048.57 901.43 10.469 1037.38 912.62 11.062 1026.19 923.81 10.078 1015 935 10.592 1003.81 946.19 10.477 992.62 957.38 9.156 981.43 968.57 9.47 970.24 979.76 9.989 959.05 990.95 9.941 947.86 1002.14 10.15 936.67 1013.33 10.29 925.48 1024.52 10.473 914.29 1035.71 11.577 903.1 1046.9 10.574 891.9 1058.1 11.377 880.71 1069.29 11.701 869.52 1080.48 11.683 858.33 1091.67 11.694 847.14 1102.86 11.93 835.95 1114.05 11.046 824.76 1125.24 11.879 813.57 1136.43 11.435 802.38 1147.62 11.316 791.19 1158.81 10.934 780 1170 11.457 770 1180 11.912 760 1190 12.163 750 1200 11.547 740 1210 12.98 730 1220 12.808 720 1230 14.329 710 1240 13.147 700 1250 13.275 690 1260 13.363 680 1270 13.261 670 1280 13.193 660 1290 12.687 650 1300 11.947 640 1310 12.02 630 1320 11.564 620 1330 11.416 610 1340 11.397 600 1350 11.591 590 1360 11.636 580 1370 12.38 570 1380 12.02 560 1390 12.296 550 1400 11.902 540 1410 12.794 530 1420 11.726 520 1430 13.513 510 1440 13.007 500 1450 12.414 490 1460 12.932 480 1470 12.672 470 1480 12.958 460 1490 12.847 450 1500 13.527 440 1510 13.092 430 1520 12.692 420 1530 13.277 410 1540 13.118 400 1550 12.459 390 1560 12.714 380 1570 13.191 370 1580 12.847 360 1590 12.735 350 1600 12.031 340 1610 11.861 320 1630 12.391 300 1650 11.241 280 1670 11.387 260 1690 11.458 240 1710 11.364 220 1730 10.976 200 1750 12.314 180 1770 11.469 150.27 1799.73 11.985 120.54 1829.46 12.38 90.81 1859.19 12.02 61.08 1888.92 11.107 31.35 1918.65 10.239 1.62 1948.38 10.248