{"NOAAStudyId":"18877","contactInfo":{"address":"325 Broadway, E/NE31","city":"Boulder","constraints":"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.","country":"USA","dataCenterUrl":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data","email":"paleo@noaa.gov","fax":"303-497-6513","longName":"National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce ","phone":"303-497-6280","postalCode":"80305-3328","shortName":"DOC/NOAA/NESDIS/NCEI","state":"CO","type":"CONTACT INFORMATION"},"contributionDate":"2015-06-12","dataPublisher":"NOAA","dataType":"ICE CORES","dataTypeInformation":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data/datasets/ice-core","difMetadataLink":"http://www1.ncdc.noaa.gov/pub/data/metadata/published/paleo/dif/xml/noaa-icecore-18877.xml","doi":null,"earliestYearBP":540,"earliestYearCE":1410,"entryId":"noaa-icecore-18877","funding":[{"fundingAgency":"US National Science Foundation","fundingGrant":"BCS-123284"}],"investigators":"Beal, S.A.; Osterberg, E.; Zdanowicz, C.M.; Fisher, D.A.","mostRecentYearBP":-48,"mostRecentYearCE":1998,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/18877","originalSource":null,"publication":[{"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.","author":{"name":"Samuel A. Beal, Erich C. Osterberg, Christian M. Zdanowicz, and David A. Fisher"},"citation":"Samuel A. Beal, Erich C. Osterberg, Christian M. Zdanowicz, and David A. Fisher. 2015. Ice Core Perspective on Mercury Pollution during the Past 600 Years. Environmental Science and Technology. . doi: 10.1021/acs.est.5b01033","edition":null,"identifier":{"id":"10.1021/acs.est.5b01033","type":"doi","url":"http://dx.doi.org/10.1021/acs.est.5b01033"},"issue":null,"journal":"Environmental Science and Technology","pages":null,"pubRank":"1","pubYear":2015,"reportNumber":null,"title":"Ice Core Perspective on Mercury Pollution during the Past 600 Years","type":"publication","volume":null}],"reconstruction":"N","scienceKeywords":null,"site":[{"NOAASiteId":"19994","geo":{"geoType":"Feature","geometry":{"coordinates":["60.58","-140.58"],"type":"POINT"},"properties":{"easternmostLongitude":"-140.58","maxElevationMeters":"5340","minElevationMeters":"5340","northernmostLatitude":"60.58","southernmostLatitude":"60.58","westernmostLongitude":"-140.58"}},"locationName":"Continent>North America>Canada","mappable":"Y","paleoData":[{"NOAADataTableId":"29256","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>ice core>chemistry"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/trop/mtlogan/logan2015hg.txt","linkText":"Mount Logan Ice Core Mercury Concentration and Flux Data","urlDescription":"Data File","variables":[{"cvAdditionalInfo":null,"cvDataType":"ICE CORES","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"meter","cvWhat":"depth variable>depth"},{"cvAdditionalInfo":null,"cvDataType":"ICE CORES","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"meter","cvWhat":"depth variable>depth>depth at sample end"},{"cvAdditionalInfo":null,"cvDataType":"ICE CORES","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"meter","cvWhat":"depth variable>depth>depth at sample start"},{"cvAdditionalInfo":null,"cvDataType":"ICE CORES","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"year Common Era","cvWhat":"age variable>age>ice age"},{"cvAdditionalInfo":null,"cvDataType":"ICE CORES","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"year Common Era","cvWhat":"age variable>age>ice age at sample end"},{"cvAdditionalInfo":null,"cvDataType":"ICE CORES","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"year Common Era","cvWhat":"age variable>age>ice age at sample start"},{"cvAdditionalInfo":null,"cvDataType":"ICE CORES","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"hydrologic material>bulk ice","cvMethod":"cold vapor atomic fluorescence spectroscopy","cvSeasonality":null,"cvShortName":null,"cvUnit":"picogram per gram","cvWhat":"chemical composition>element or single-element molecule>mercury"},{"cvAdditionalInfo":null,"cvDataType":"ICE CORES","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"hydrologic material>bulk ice","cvMethod":"cold vapor atomic fluorescence spectroscopy","cvSeasonality":null,"cvShortName":null,"cvUnit":"microgram per square meter per year","cvWhat":"chemical composition>element or single-element molecule>mercury"},{"cvAdditionalInfo":null,"cvDataType":"ICE CORES","cvDetail":null,"cvError":"one standard deviation","cvFormat":"Numeric","cvMaterial":"hydrologic material>bulk ice","cvMethod":"cold vapor atomic fluorescence spectroscopy","cvSeasonality":null,"cvShortName":null,"cvUnit":"microgram per square meter per year","cvWhat":"chemical composition>element or single-element molecule>mercury"},{"cvAdditionalInfo":null,"cvDataType":"ICE CORES","cvDetail":"smoothed","cvError":null,"cvFormat":"Numeric","cvMaterial":"hydrologic material>bulk ice","cvMethod":"cold vapor atomic fluorescence spectroscopy","cvSeasonality":null,"cvShortName":null,"cvUnit":"microgram per square meter per year","cvWhat":"chemical composition>element or single-element molecule>mercury"},{"cvAdditionalInfo":null,"cvDataType":"ICE CORES","cvDetail":null,"cvError":"one standard deviation","cvFormat":"Numeric","cvMaterial":"hydrologic material>bulk ice","cvMethod":"cold vapor atomic fluorescence spectroscopy","cvSeasonality":null,"cvShortName":null,"cvUnit":"picogram per gram","cvWhat":"chemical composition>element or single-element molecule>mercury"}]}],"dataTableName":"Logan2015Hg","dataTableNotes":null,"earliestYear":1410,"earliestYearBP":540,"earliestYearCE":1410,"mostRecentYear":1998,"mostRecentYearBP":-48,"mostRecentYearCE":1998,"species":[],"timeUnit":"AD"}],"siteName":"Mt. Logan"}],"studyCode":null,"studyName":"Mount Logan, Yukon Ice Core 600 Year Mercury Data","studyNotes":"Total mercury concentrations and fluxes for discrete sections of the PRCol ice core from Mount Logan between AD 1410 and 1998","version":"1.0","xmlId":"16561"}