{"NOAAStudyId":"13075","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":"2012-06-30","dataPublisher":"NOAA","dataType":"PALEOLIMNOLOGY","dataTypeInformation":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data/datasets/lake","difMetadataLink":"http://www1.ncdc.noaa.gov/pub/data/metadata/published/paleo/dif/xml/noaa-lake-13075.xml","doi":null,"earliestYearBP":12569,"earliestYearCE":-10619,"entryId":"noaa-lake-13075","funding":[],"investigators":"Wooller, M.J.; Pohlman, J.; Gaglioti, B.V.; Langdon, P.G.; Jones, M.C.; Walter Anthony, K.M.; Becker, K.W.; Hinrichs, K.-U.; Elvert, M.","mostRecentYearBP":0,"mostRecentYearCE":1950,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/13075","originalSource":null,"publication":[{"abstract":"Atmospheric contributions of methane from Arctic wetlands during \r\nthe Holocene are dynamic and linked to climate oscillations. However, \r\nlong-term records linking climate variability to methane availability \r\nin Arctic wetlands are lacking. We present a multi-proxy ~12,000 year \r\npaleoecological reconstruction of intermittent methane availability \r\nfrom a radiocarbon-dated sediment core (LQ-West) taken from a shallow \r\ntundra lake (Qalluuraq Lake) in Arctic Alaska. Specifically, stable \r\ncarbon isotopic values of photosynthetic biomarkers and methane are \r\nutilized to estimate the proportional contribution of methane-derived \r\ncarbon to lake-sediment-preserved benthic (chironomids) and pelagic \r\n(cladocerans) components over the last ~12,000 years. These results \r\nwere compared to temperature, hydrologic, and habitat reconstructions \r\nfrom the same site using chironomid assemblage data, oxygen isotopes \r\nof chironomid head capsules, and radiocarbon ages of plant macrofossils. \r\nCladoceran ephippia from ~4,000 cal year BP sediments have d13C values \r\nthat range from ~-39 to -31‰, suggesting peak methane carbon assimilation \r\nat that time. These low d13C values coincide with an apparent decrease \r\nin effective moisture and development of a wetland that included \r\nSphagnum subsecundum. Incorporation of methane-derived carbon by \r\nchironomids and cladocerans decreased from ~2,500 to 1,500 cal year BP, \r\ncoinciding with a temperature decrease. Live-collected chironomids \r\nwith a radiocarbon age of 1,640 cal year BP, and fossil chironomids \r\nfrom 1,500 cal year BP in the core illustrate that ‘old’ carbon \r\nhas also contributed to the development of the aquatic ecosystem \r\nsince ~1,500 cal year BP. The relatively low d13C values of aquatic \r\ninvertebrates (as low as -40.5‰) provide evidence of methane \r\nincorporation by lake invertebrates, and suggest intermittent \r\nclimate-linked methane release from the lake throughout the Holocene. ","author":null,"citation":"Wooller, M.J., J.W. Pohlman, B.V. Gaglioti, P. Langdon, M. Jones, \r\nK.M. Walter Anthony, K.W. Becker, K.-U. Hinrichs, and M. Elvert. 2012. \r\nReconstruction of past methane availability in an Arctic Alaska wetland \r\nindicates climate influenced methane release during the past ~12,000 years. \r\nJournal of Paleolimnology, Vol. 48, No. 1, June 2012, pp. 27-42. \r\nDOI: 10.1007/s10933-012-9591-8 ","edition":null,"identifier":{"id":"10.1007/s10933-012-9591-8","type":"doi","url":"http://dx.doi.org/10.1007/s10933-012-9591-8"},"issue":null,"journal":"Journal of Paleolimnology","pages":null,"pubRank":"1","pubYear":2012,"reportNumber":null,"title":"Reconstruction of past methane availability in an Arctic Alaska wetland  indicates climate influenced methane release during the past ~12,000 years","type":"publication","volume":null}],"reconstruction":"Y","scienceKeywords":["Arctic","PAGES Arctic 2k"],"site":[{"NOAASiteId":"53153","geo":{"geoType":"Feature","geometry":{"coordinates":["70.379","-157.348"],"type":"POINT"},"properties":{"easternmostLongitude":"-157.348","maxElevationMeters":"13","minElevationMeters":"13","northernmostLatitude":"70.379","southernmostLatitude":"70.379","westernmostLongitude":"-157.348"}},"locationName":"Continent>North America>United States Of America>Alaska","mappable":"Y","paleoData":[{"NOAADataTableId":"22529","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>paleolimnology>reconstruction","earth science>paleoclimate>paleolimnology>carbon isotopes","earth science>paleoclimate>paleolimnology>geochemistry","earth science>paleoclimate>paleolimnology>oxygen isotopes","earth science>paleoclimate>paleolimnology>physical properties","earth science>paleoclimate>paleolimnology>population abundance"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/qalluuraq2012.txt","linkText":"qalluuraq2012.txt","urlDescription":"Data","variables":[{"cvAdditionalInfo":"partial least squares regression","cvDataType":"CLIMATE RECONSTRUCTIONS|INSECT|PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"reconstruction material>biological assemblage>midge assemblage","cvMethod":"regression analysis","cvSeasonality":"1-month period>Jul","cvShortName":null,"cvUnit":"degree Celsius","cvWhat":"earth system variable>temperature variable>temperature>air temperature>surface air temperature"},{"cvAdditionalInfo":null,"cvDataType":"CLIMATE RECONSTRUCTIONS|INSECT|PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"centimeter","cvWhat":"depth variable>depth"},{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"dimensionless (SI system)","cvWhat":"magnetic property>magnetic moments>magnetic susceptibility"},{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":"elemental analysis","cvSeasonality":null,"cvShortName":null,"cvUnit":"percent","cvWhat":"chemical composition>element or single-element molecule>carbon>organic carbon"},{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":"elemental analysis","cvSeasonality":null,"cvShortName":null,"cvUnit":"percent","cvWhat":"chemical composition>element or single-element molecule>nitrogen"},{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil","cvWhat":"chemical composition>isotope>isotope ratio>delta 15N"},{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil VPDB","cvWhat":"chemical composition>isotope>isotope ratio>delta 13C"},{"cvAdditionalInfo":"total organic carbon/total nitrogen","cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":"elemental analysis","cvSeasonality":null,"cvShortName":null,"cvUnit":"dimensionless","cvWhat":"chemical composition>element or compound ratio>carbon/nitrogen"},{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"biological material>organism>cladoceran>ephippia","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil VPDB","cvWhat":"chemical composition>isotope>isotope ratio>delta 13C"},{"cvAdditionalInfo":"cholesterol biomarker","cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"biological material>bulk biological material>organic matter","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil VPDB","cvWhat":"chemical composition>isotope>isotope ratio>delta 13C"},{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"chemical composition>compound>organic compound>hydrocarbon>alkane>n-alkane>C27 n-alkane","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil VPDB","cvWhat":"chemical composition>isotope>isotope ratio>delta 13C"},{"cvAdditionalInfo":null,"cvDataType":"INSECT|PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"biological material>organism>midge","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil VSMOW","cvWhat":"chemical composition>isotope>isotope ratio>delta 18O"},{"cvAdditionalInfo":"not trophically adjusted","cvDataType":"INSECT|PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"biological material>organism>midge","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil VPDB","cvWhat":"chemical composition>isotope>isotope ratio>delta 13C"}]},{"NOAAKeywords":["earth science>paleoclimate>paleolimnology>carbon isotopes","earth science>paleoclimate>paleolimnology>physical properties","earth science>paleoclimate>paleolimnology>population abundance","earth science>paleoclimate>paleolimnology>geochemistry","earth science>paleoclimate>paleolimnology>reconstruction","earth science>paleoclimate>paleolimnology>oxygen isotopes"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/qalluuraq2012.xls","linkText":"qalluuraq2012.xls","urlDescription":"Data","variables":[]}],"dataTableName":"LQwest","dataTableNotes":null,"earliestYear":12569,"earliestYearBP":12569,"earliestYearCE":-10619,"mostRecentYear":0,"mostRecentYearBP":0,"mostRecentYearCE":1950,"species":[],"timeUnit":"cal yr BP"}],"siteName":"Qalluuraq Lake"}],"studyCode":null,"studyName":"Qalluuraq Lake, Alaska 12,000 Year Multiproxy Methane Sediment Data","studyNotes":"Multiproxy sediment data from Qalluuraq Lake, Alaska, \nfor the past 12,000 years. Paleoenvironmental proxies measured \ninclude stable isotopic ratios, organic carbon, magnetics, \nand plant macrofossils.","version":"1.0","xmlId":"11117"}