noaa-icecore-18877 Mount Logan, Yukon Ice Core 600 Year Mercury Data Beal, S.A.; Osterberg, E.; Zdanowicz, C.M.; Fisher, D.A. Mount Logan, Yukon Ice Core 600 Year Mercury Data 2015-06-12 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/18877 Investigator S.A. Beal Investigator E. Osterberg Investigator C.M. Zdanowicz Investigator D.A. Fisher 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 chemistry geoscientificInformation 1410 AD 1998 AD 540 cal yr BP -48 cal yr BP Complete 60.58 60.58 -140.58 -140.58 5340 5340 Continent North America Canada Mt. Logan>LATITUDE 60.58>LONGITUDE -140.58 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII Samuel A. Beal, Erich C. Osterberg, Christian M. Zdanowicz, and David A. Fisher 2015 Environmental Science and Technology 10.1021/acs.est.5b01033 http://pubs.acs.org/doi/abs/10.1021%2Facs.est.5b01033

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

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/trop/mtlogan/logan2015hg.txt Data File; Mount Logan Ice Core Mercury Concentration and Flux Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11