# Mount Logan, Yukon Ice Core 600 Year Mercury Data #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program # National Centers for Environmental Information (NCEI) #----------------------------------------------------------------------- # # 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/18877 # Online_Resource: http://www1.ncdc.noaa.gov/pub/data/paleo/icecore/trop/mtlogan/logan2015hg.txt # # Original_Source_URL: # # Description/Documentation lines begin with # # Data lines have no # # # Archive: Ice Cores # # Parameter_Keywords: mercury, trace metal, pollution #-------------------- # Contribution_Date # Date: 2015-06-12 #-------------------- # Title # Study_Name: Mount Logan, Yukon Ice Core 600 Year Mercury Data #-------------------- # Investigators # Investigators: Beal, S.; Osterberg, E.; Zdanowicz, C.; Fisher, D. #-------------------- # Description_and_Notes # Description: Total mercury concentrations and fluxes for discrete sections of the PRCol ice core from Mount Logan between AD 1410 and 1998 #-------------------- # Publication # Authors: Samuel A. Beal, Erich C. Osterberg, Christian M. Zdanowicz, and David A. Fisher # Published_Date_or_Year: 2015-05-26 # Published_Title: Ice Core Perspective on Mercury Pollution during the Past 600 Years # Journal_Name: Environmental Science and Technology # Volume: # Edition: # Issue: # Pages: # Report_Number: # DOI: 10.1021/acs.est.5b01033 # Online_Resource: http://pubs.acs.org/doi/abs/10.1021%2Facs.est.5b01033 # Full_Citation: # Abstract: Past emissions of the toxic metal mercury (Hg) persist in the global environment, yet these emissions remain poorly constrained by existing data. Ice cores are high-resolution archives of atmospheric deposition that may provide crucial insight into past atmospheric Hg levels during recent and historical time. Here we present a record of total Hg (HgT) in an ice core from the pristine summit plateau (5340 m asl) of Mount Logan, Yukon, Canada, representing atmospheric deposition from AD 1410 to 1998. The Colonial Period (~1603-1850) and North American "Gold Rush" (1850-1900) represent minor fractions (8% and 14%, respectively) of total anthropogenic Hg deposition in the record, with the majority (78%) occurring during the 20th Century. A period of maximum HgT fluxes from 1940 to 1975 coincides with estimates of enhanced anthropogenic Hg emissions from commercial sources, as well as with industrial emissions of other toxic metals. Rapid declines in HgT fluxes following peaks during the Gold Rush and the mid-20th Century indicate that atmospheric Hg deposition responds quickly to reductions in emissions. Increasing HgT fluxes from 1993 until the youngest samples in 1998 may reflect the resurgence of Hg emissions from unregulated coal burning and small-scale gold mining. #------------------ # Funding_Agency # Funding_Agency_Name: US National Science Foundation # Grant: BCS-123284 #------------------ # Site_Information # Site_Name: Mount Logan # Location: North America>Canada>Yukon Territory # Country: Canada # Northernmost_Latitude: 60.58 # Southernmost_Latitude: 60.58 # Easternmost_Longitude: -140.50 # Westernmost_Longitude: -140.50 # Elevation: 5340 m #------------------ # Data_Collection # Collection_Name: Logan2015Hg # Earliest_Year: 1410 # Most_Recent_Year: 1998 # Time_Unit: AD # Core_Length: m # Notes: #------------------ # Chronology_Information # Chronology: Chronology from Osterberg et al., 2008, Ice core record of rising lead pollution in the North Pacific atmosphere, # Geophysical Research Letters, 35, L05810, doi:10.1029/2007GL032680 # #---------------- # Variables # # Data variables follow are preceded by "##" in columns one and two. # Data line variables format: Variables list, one per line, shortname-tab-longname-tab-longname components (9 components: what, material, error, units, seasonality, archive, detail, method, C or N for Character or Numeric data) # ## depth_top_m depth top, , , m, , , , ,N ## depth_bot_m depth bottom, , , m, , , , ,N ## depth_m depth, , , m, , , median, ,N ## age_ADtop age, , , AD, , , , ,N ## age_ADbot age, , , AD, , , , ,N ## age_AD age, , , AD, , , , ,N ## Hg.pg/g Mercury concentration, , , pg/g, ,ice core, Samples below detection limit designated as less-than sign and detection limit for that sample, EPA 1631E CVAFS,N ## Hg.pg/g1S Mercury concentration 1S error, , , pg/g, ,ice core, , ,N ## Hgflux Mercury total flux, , , ug/m/yr, ,ice core, , ,N ## Hgflux1s Mercury total flux 1S error, , , ug/m/yr, ,ice core, , ,N ## Hgflux-sm Mercury total flux Loess Smoother (delta 0.25), , , ug/m/yr, ,ice core, , ,N # #---------------- # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Values: N/A # depth_top_m depth_bot_m depth_m age_ADtop age_ADbot age_AD Hg.pg/g Hg.pg/g1S Hgflux Hgflux1S Hgflux-sm 3.27 3.58 3.42 1998.33 1997.98 1998.15 0.501 0.012 0.189 0.004 0.358 3.58 3.79 3.68 1997.98 1997.74 1997.86 0.547 0.088 0.207 0.033 0.346 3.79 4.03 3.91 1997.74 1997.47 1997.60 0.660 0.106 0.249 0.040 0.336 6.35 6.57 6.46 1994.94 1994.56 1994.75 0.809 0.148 0.243 0.045 0.242 6.57 6.80 6.69 1994.56 1994.15 1994.36 1.183 0.085 0.521 0.037 0.231 6.80 7.06 6.93 1994.15 1993.78 1993.97 1.398 0.073 0.615 0.032 0.221 8.40 8.76 8.58 1992.20 1991.61 1991.91 0.720 0.014 0.200 0.004 0.179 8.76 9.05 8.91 1991.61 1991.06 1991.34 0.312 0.014 0.093 0.004 0.171 9.05 9.35 9.20 1991.06 1990.50 1990.78 0.258 0.018 0.077 0.005 0.164 9.35 9.59 9.47 1990.50 1990.05 1990.27 0.448 0.072 0.133 0.021 0.158 9.59 9.89 9.74 1990.05 1989.49 1989.77 0.167 0.029 0.050 0.009 0.152 12.94 13.27 13.11 1984.87 1984.38 1984.63 0.341 0.052 0.129 0.020 0.149 13.27 13.47 13.37 1984.38 1984.09 1984.24 0.342 0.061 0.171 0.030 0.151 13.47 13.66 13.57 1984.09 1983.82 1983.96 0.585 0.088 0.293 0.044 0.153 15.17 15.48 15.32 1981.53 1980.90 1981.21 0.808 0.016 0.224 0.005 0.254 15.48 15.79 15.63 1980.90 1980.27 1980.58 1.488 0.018 0.412 0.005 0.287 18.86 19.16 19.01 1975.36 1974.84 1975.10 0.133 0.019 0.051 0.007 0.558 19.16 19.43 19.29 1974.84 1974.38 1974.61 1.128 0.006 0.432 0.002 0.574 20.10 20.46 20.28 1973.23 1972.48 1972.86 3.516 0.232 1.057 0.070 0.639 20.46 20.78 20.62 1972.48 1971.80 1972.14 2.755 0.021 0.911 0.007 0.660 24.01 24.18 24.10 1965.94 1965.64 1965.79 0.772 0.032 0.276 0.012 0.747 24.18 24.34 24.26 1965.64 1965.35 1965.49 1.040 0.036 0.637 0.022 0.747 24.34 24.50 24.42 1965.35 1965.07 1965.21 0.804 0.030 0.492 0.018 0.746 27.10 27.33 27.22 1961.14 1960.64 1960.89 2.090 0.005 0.691 0.002 0.632 27.33 27.66 27.50 1960.64 1959.89 1960.26 2.716 0.005 1.155 0.002 0.621 29.52 29.80 29.66 1956.37 1955.79 1956.08 1.395 0.045 0.508 0.016 0.555 29.80 30.13 29.96 1955.79 1955.10 1955.45 0.429 0.043 0.208 0.021 0.543 32.38 32.57 32.48 1951.29 1950.95 1951.12 0.498 0.014 0.236 0.006 0.466 32.57 32.76 32.67 1950.95 1950.64 1950.80 0.318 0.014 0.151 0.006 0.461 32.76 32.95 32.86 1950.64 1950.31 1950.47 0.363 0.013 0.156 0.005 0.457 35.52 35.79 35.66 1945.77 1945.25 1945.51 2.293 0.042 1.011 0.018 0.379 35.79 36.10 35.95 1945.25 1944.73 1944.99 0.867 0.042 0.468 0.023 0.372 38.41 38.61 38.51 1940.67 1940.33 1940.50 0.846 0.013 0.370 0.006 0.327 38.61 38.80 38.70 1940.33 1940.00 1940.16 0.345 0.016 0.212 0.010 0.323 38.80 39.00 38.90 1940.00 1939.63 1939.81 0.140 0.013 0.086 0.008 0.319 42.55 42.82 42.68 1933.19 1932.75 1932.97 <0.13 N/A N/A N/A N/A 42.82 43.10 42.96 1932.75 1932.29 1932.52 <0.13 N/A N/A N/A N/A 44.23 44.48 44.35 1929.69 1929.20 1929.44 0.313 0.042 0.130 0.017 0.192 44.48 44.75 44.61 1929.20 1928.64 1928.92 0.161 0.043 0.067 0.018 0.187 45.64 45.71 45.68 1926.42 1926.26 1926.34 <0.06 N/A N/A N/A N/A 45.71 45.81 45.76 1926.26 1926.03 1926.15 <0.06 N/A N/A N/A N/A 45.81 45.87 45.84 1926.03 1925.84 1925.94 <0.06 N/A N/A N/A N/A 45.87 45.99 45.93 1925.84 1925.54 1925.69 0.081 0.023 0.027 0.008 0.152 45.99 46.06 46.03 1925.54 1925.34 1925.44 <0.06 N/A N/A N/A N/A 48.11 48.21 48.16 1921.26 1920.99 1921.12 0.144 0.027 0.055 0.010 0.112 48.21 48.32 48.27 1920.99 1920.73 1920.86 0.169 0.031 0.064 0.012 0.111 48.32 48.59 48.46 1920.73 1920.11 1920.42 1.062 0.015 0.429 0.006 0.110 49.70 49.85 49.78 1916.99 1916.55 1916.77 <0.04 N/A N/A N/A N/A 49.85 49.95 49.90 1916.55 1916.26 1916.40 0.065 0.018 0.023 0.006 0.115 49.95 50.08 50.02 1916.26 1915.89 1916.07 0.065 0.018 0.023 0.006 0.115 55.41 55.59 55.50 1905.55 1905.25 1905.40 0.076 0.008 0.021 0.002 0.078 55.59 55.70 55.65 1905.25 1905.07 1905.16 0.150 0.073 0.042 0.021 0.078 55.70 55.93 55.82 1905.07 1904.40 1904.73 0.068 0.011 0.019 0.003 0.079 58.30 58.41 58.35 1898.99 1898.57 1898.78 0.330 0.056 0.081 0.014 0.120 58.41 58.49 58.45 1898.57 1898.27 1898.42 0.064 0.022 0.031 0.010 0.122 58.49 58.65 58.57 1898.27 1897.82 1898.05 0.861 0.139 0.413 0.067 0.124 59.13 59.23 59.18 1896.74 1896.45 1896.59 0.165 0.032 0.052 0.010 0.131 59.23 59.32 59.27 1896.45 1896.17 1896.31 <0.06 N/A N/A N/A N/A 59.32 59.41 59.36 1896.17 1895.87 1896.02 <0.06 N/A N/A N/A N/A 60.67 60.80 60.73 1892.07 1891.75 1891.91 0.263 0.046 0.092 0.016 0.154 60.80 60.88 60.84 1891.75 1891.50 1891.62 0.723 0.117 0.252 0.041 0.155 60.88 61.05 60.97 1891.50 1891.02 1891.26 0.326 0.056 0.187 0.032 0.155 62.26 62.47 62.37 1888.83 1888.24 1888.53 0.090 0.024 0.030 0.008 0.145 62.47 62.64 62.55 1888.24 1887.84 1888.04 0.148 0.030 0.081 0.017 0.141 64.69 64.77 64.73 1883.62 1883.44 1883.53 0.422 0.047 0.171 0.019 0.112 64.77 64.88 64.82 1883.44 1883.18 1883.31 0.565 0.093 0.317 0.052 0.112 64.88 64.95 64.91 1883.18 1882.99 1883.08 <0.07 N/A N/A N/A N/A 64.95 65.07 65.01 1882.99 1882.77 1882.88 0.330 0.058 0.185 0.032 0.111 65.07 65.25 65.16 1882.77 1882.44 1882.61 <0.07 N/A N/A N/A N/A 67.60 67.69 67.65 1877.18 1877.01 1877.09 0.208 0.040 0.061 0.012 0.127 67.69 67.80 67.75 1877.01 1876.62 1876.81 0.095 0.028 0.028 0.008 0.128 67.80 67.89 67.85 1876.62 1876.31 1876.46 <0.07 N/A N/A N/A N/A 67.89 67.97 67.93 1876.31 1876.06 1876.18 0.151 0.033 0.058 0.013 0.128 70.76 70.87 70.82 1868.51 1868.17 1868.34 0.651 0.077 0.197 0.023 0.123 70.87 71.06 70.96 1868.17 1867.56 1867.87 0.541 0.088 0.164 0.027 0.122 71.06 71.13 71.09 1867.56 1867.31 1867.44 0.477 0.078 0.202 0.033 0.121 72.52 72.62 72.57 1863.61 1863.35 1863.48 <0.08 N/A N/A N/A N/A 72.62 72.69 72.65 1863.35 1863.18 1863.26 <0.08 N/A N/A N/A N/A 72.69 72.73 72.71 1863.18 1863.04 1863.11 0.136 0.034 0.051 0.013 0.108 72.73 72.84 72.78 1863.04 1862.75 1862.90 0.089 0.030 0.033 0.011 0.108 74.63 74.76 74.70 1858.38 1858.06 1858.22 <0.07 N/A N/A N/A N/A 74.76 74.91 74.83 1858.06 1857.58 1857.82 <0.07 N/A N/A N/A N/A 74.91 74.98 74.95 1857.58 1857.35 1857.47 0.124 0.030 0.055 0.014 0.092 74.98 75.15 75.06 1857.35 1856.88 1857.11 <0.06 N/A N/A N/A N/A 75.15 75.32 75.24 1856.88 1856.43 1856.65 0.212 0.033 0.095 0.015 0.089 75.89 75.99 75.94 1855.01 1854.77 1854.89 0.033 0.009 0.017 0.005 0.084 75.99 76.10 76.04 1854.77 1854.54 1854.66 <0.02 N/A N/A N/A N/A 76.10 76.32 76.21 1854.54 1854.04 1854.29 <0.02 N/A N/A N/A N/A 77.61 77.88 77.74 1850.85 1850.07 1850.46 <0.02 N/A N/A N/A N/A 77.88 78.01 77.94 1850.07 1849.80 1849.94 0.149 0.015 0.088 0.009 0.072 79.24 79.38 79.31 1847.13 1846.82 1846.98 <0.12 N/A N/A N/A N/A 79.38 79.51 79.45 1846.82 1846.47 1846.65 <0.12 N/A N/A N/A N/A 79.51 79.61 79.56 1846.47 1846.24 1846.36 <0.12 N/A N/A N/A N/A 79.61 79.65 79.63 1846.24 1846.14 1846.19 <0.12 N/A N/A N/A N/A 80.39 80.50 80.45 1844.12 1843.76 1843.94 <0.07 N/A N/A N/A N/A 80.50 80.59 80.54 1843.76 1843.48 1843.62 <0.07 N/A N/A N/A N/A 80.59 80.70 80.64 1843.48 1843.07 1843.27 <0.07 N/A N/A N/A N/A 80.70 80.86 80.78 1843.07 1842.73 1842.90 <0.06 N/A N/A N/A N/A 80.86 81.02 80.94 1842.73 1842.36 1842.55 <0.06 N/A N/A N/A N/A 83.67 83.82 83.74 1835.80 1835.24 1835.52 <0.24 N/A N/A N/A N/A 83.82 84.02 83.92 1835.24 1834.49 1834.87 <0.24 N/A N/A N/A N/A 84.02 84.10 84.06 1834.49 1834.16 1834.32 0.104 0.054 0.058 0.030 0.045 84.10 84.30 84.20 1834.16 1833.64 1833.90 0.032 0.017 0.018 0.009 0.045 86.70 86.82 86.76 1826.99 1826.57 1826.78 <0.24 N/A N/A N/A N/A 86.82 87.02 86.92 1826.57 1825.81 1826.19 <0.24 N/A N/A N/A N/A 87.02 87.20 87.11 1825.81 1825.00 1825.40 0.097 0.012 0.049 0.006 0.051 90.23 90.43 90.33 1815.48 1814.93 1815.20 0.097 0.004 0.041 0.002 0.058 90.43 90.56 90.50 1814.93 1814.45 1814.69 0.264 0.027 0.111 0.011 0.058 94.51 94.62 94.57 1797.44 1796.89 1797.17 0.172 0.038 0.093 0.020 0.047 94.62 94.84 94.73 1796.89 1796.18 1796.54 <0.06 N/A N/A N/A N/A 95.69 95.85 95.77 1792.13 1791.27 1791.70 <0.12 N/A N/A N/A N/A 95.85 96.00 95.92 1791.27 1790.59 1790.93 <0.12 N/A N/A N/A N/A 98.39 98.51 98.45 1780.45 1779.95 1780.20 <0.12 N/A N/A N/A N/A 98.51 98.63 98.57 1779.95 1779.34 1779.64 0.131 0.044 0.056 0.019 0.034 100.77 100.97 100.87 1766.52 1765.05 1765.78 0.035 0.007 0.010 0.002 0.026 100.97 101.17 101.07 1765.05 1763.59 1764.32 <0.01 N/A N/A N/A N/A 101.28 101.46 101.37 1763.07 1761.76 1762.42 <0.24 N/A N/A N/A N/A 105.30 105.43 105.37 1730.36 1729.19 1729.78 0.023 0.015 0.010 0.007 0.021 105.96 106.13 106.04 1724.62 1723.08 1723.85 0.026 0.015 0.011 0.007 0.021 107.76 107.94 107.85 1708.04 1706.34 1707.19 <0.24 N/A N/A N/A N/A 108.00 108.20 108.10 1705.84 1703.90 1704.87 0.022 0.009 0.009 0.004 0.023 109.93 110.07 110.00 1686.58 1685.08 1685.83 0.163 0.036 0.069 0.021 0.027 111.49 111.66 111.57 1669.88 1667.90 1668.89 <0.01 N/A N/A N/A N/A 114.05 114.19 114.12 1640.00 1638.18 1639.09 0.143 0.014 0.061 0.014 0.032 116.76 116.96 116.86 1604.41 1601.59 1603.00 0.064 0.004 0.027 0.006 0.029 119.59 119.75 119.67 1562.30 1559.71 1561.00 0.035 0.017 0.015 0.008 0.025 121.18 121.36 121.27 1535.96 1532.82 1534.39 0.038 0.012 0.016 0.006 0.023 123.66 123.76 123.71 1492.23 1490.19 1491.21 0.035 0.009 0.015 0.005 0.021 127.50 127.61 127.56 1415.41 1413.14 1414.28 <0.24 N/A N/A N/A N/A 127.61 127.80 127.71 1413.14 1408.86 1411.00 0.053 0.007 0.023 0.006 0.019