Mount Logan, Yukon Ice Core 600 Year Mercury Data Beal, S.A.; Osterberg, E.; Zdanowicz, C.M.; Fisher, D.A. Beal, S.A. Osterberg, E. Zdanowicz, C.M. Fisher, D.A. earth science/paleoclimate/ice cores (depth at sample start,null,null,meter,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (ice age,null,null,year Common Era,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (mercury,bulk ice,null,picogram per gram,null,ice cores,null,cold vapor atomic fluorescence spectroscopy,N,null) earth science/paleoclimate/ice cores (depth at sample end,null,null,meter,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (ice age at sample end,null,null,year Common Era,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (mercury,bulk ice,null,microgram per square meter per year,null,ice cores,null,cold vapor atomic fluorescence spectroscopy,N,null) earth science/paleoclimate/ice cores (mercury,bulk ice,one standard deviation,microgram per square meter per year,null,ice cores,null,cold vapor atomic fluorescence spectroscopy,N,null) earth science/paleoclimate/ice cores (depth,null,null,meter,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (mercury,bulk ice,one standard deviation,picogram per gram,null,ice cores,null,cold vapor atomic fluorescence spectroscopy,N,null) earth science/paleoclimate/ice cores (ice age at sample start,null,null,year Common Era,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (mercury,bulk ice,null,microgram per square meter per year,null,ice cores,smoothed,cold vapor atomic fluorescence spectroscopy,N,null) earth science/paleoclimate/ice core (Mt. Logan>LATITUDE 60.58>LONGITUDE -140.58) 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. STUDY NOTES: Total mercury concentrations and fluxes for discrete sections of the PRCol ice core from Mount Logan between AD 1410 and 1998 NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Beal, S.A. Investigator : Osterberg, E. Investigator : Zdanowicz, C.M. Investigator : Fisher, D.A. 2015-06-12 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/18877 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/trop/mtlogan/logan2015hg.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/trop/mtlogan/logan2015hg.txt English https://www.ncdc.noaa.gov/paleo/study/18877 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/trop/mtlogan/logan2015hg.txt Samuel A. Beal, Erich C. Osterberg, Christian M. Zdanowicz, and David A. Fisher2015Ice Core Perspective on Mercury Pollution during the Past 600 YearsEnvironmental Science and Technology10.1021/acs.est.5b01033http://pubs.acs.org/doi/abs/10.1021%2Facs.est.5b01033 START YEAR: 1410 AD * END YEAR: 1998 AD -140.58 60.58 -140.58 60.58