{"NOAAStudyId":"17367","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":"2014-10-19","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-17367.xml","doi":null,"earliestYearBP":-50,"earliestYearCE":2000,"entryId":"noaa-lake-17367","funding":[{"fundingAgency":"US National Science Foundation","fundingGrant":"OCE0961697"}],"investigators":"Shanahan, T.M.; Hughen, K.A.; Ampel, L.; Sauer, P.E.; Fornace, K.","mostRecentYearBP":-50,"mostRecentYearCE":2000,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/17367","originalSource":null,"publication":[{"abstract":"The hydrogen isotope composition of plant waxes preserved in lacustrine sediments is a potentially valuable tool for reconstructing paleoenvironmental changes in the Arctic. However, in contrast to the mid- and low-latitudes, significantly less effort has been directed towards understanding the factors controlling D/H fractionation in high latitude plant waxes and the impact of these processes on the interpretation of sedimentary leaf wax dD records. To better understand these processes, we examined the D/H ratios of long chain fatty acids in lake surface sediments spanning a temperature and precipitation gradient on Baffin Island in the eastern Canadian Arctic. D/H ratios of plant waxes increase with increasing temperature and aridity, with values ranging from -240 per mil to -160 per mil over the study area. Apparent fractionation factors between n-alkanoic acids in Arctic lake sediments and precipitation (EFA-ppt) are less negative than those of mid-latitude lakes and modern plants by 25 per mil to 65 per mil, consistent with n-alkane data from modern Arctic plants (Yang et al., 2011). Furthermore, EFA-ppt values from Arctic lakes become systematically more positive with increasing evaporation, in contrast to mid-latitude sites, which show little to no change in fractionation with aridity. These data are consistent with enhanced water loss and isotope fractionation at higher latitude in the Arctic summer, when continuous sunlight supports increased daily photosynthesis. The dominant control on dDFA variations on Baffin Island is temperature. However, changing EFA-ppt result in steeper dDFA-temperature relationships than observed for modern precipitation. The application of this dDFA-based paleotemperature calibration to existing dDFA records from Baffin Island produces much more realistic changes in late Holocene temperature and highlights the importance of these effects in influencing the interpretation of Arctic dDFA records. A better understanding of the controls on hydrogen isotope fractionation in high latitude leaf waxes will be essential to the proper interpretation of isotope records from sedimentary plant waxes in the Arctic.","author":{"name":"Timothy M. Shanahan, Konrad A. Hughen, Linda Ampel, Peter E. Sauer, Kyrstin Fornace"},"citation":"Timothy M. Shanahan, Konrad A. Hughen, Linda Ampel, Peter E. Sauer, Kyrstin Fornace. 2013. Environmental controls on the 2H/1H values of terrestrial leaf waxes in the eastern Canadian Arctic. Geochimica et Cosmochimica Acta, 119, 286-301. doi: 110.1016/j.gca.2013.05.032","edition":null,"identifier":{"id":"110.1016/j.gca.2013.05.032","type":"doi","url":"http://dx.doi.org/110.1016/j.gca.2013.05.032"},"issue":null,"journal":"Geochimica et Cosmochimica Acta","pages":"286-301","pubRank":"1","pubYear":2013,"reportNumber":null,"title":"Environmental controls on the 2H/1H values of terrestrial leaf waxes in the eastern Canadian Arctic","type":"publication","volume":"119"}],"reconstruction":"N","scienceKeywords":null,"site":[{"NOAASiteId":"56315","geo":{"geoType":"Feature","geometry":{"coordinates":["62.112","73.042","-87.18","-62.17"],"type":"POLYGON"},"properties":{"easternmostLongitude":"-62.17","maxElevationMeters":null,"minElevationMeters":null,"northernmostLatitude":"73.042","southernmostLatitude":"62.112","westernmostLongitude":"-87.18"}},"locationName":"Continent>North America>Canada>Nunavut","mappable":"N","paleoData":[{"NOAADataTableId":"27619","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>paleolimnology>hydrogen isotopes"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/canada/baffin/baffin2013ddwax.txt","linkText":"Baffin Island Lakes Surface Sediment Leaf Wax dD Data","urlDescription":"Data File","variables":[{"cvAdditionalInfo":"latitude designation","cvDataType":null,"cvDetail":null,"cvError":null,"cvFormat":"Character","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":null,"cvWhat":"sampling metadata>notes"},{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":null,"cvWhat":"sampling metadata>sample identification"},{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"degree north","cvWhat":"sampling metadata>latitude"},{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"degree east","cvWhat":"sampling metadata>longitude"},{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"meter","cvWhat":"sampling metadata>collection elevation"},{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"chemical composition>compound>organic compound>organooxygen compound>fatty acid>n-alkanoic acid>C28 n-alkanoic acid","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil VSMOW","cvWhat":"chemical composition>isotope>isotope ratio>delta 2H"},{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"chemical composition>compound>organic compound>organooxygen compound>fatty acid>n-alkanoic acid>C30 n-alkanoic acid","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil VSMOW","cvWhat":"chemical composition>isotope>isotope ratio>delta 2H"},{"cvAdditionalInfo":"estimated from the NCEP Reanalysis dataset (Kalnay et al. 1996)","cvDataType":"INSTRUMENTAL","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":"annual","cvShortName":null,"cvUnit":null,"cvWhat":"earth system variable>hydroclimatic variable>hydroclimate ratio>relative humidity"},{"cvAdditionalInfo":"estimated from the NCEP Reanalysis dataset (Kalnay et al. 1996)","cvDataType":"INSTRUMENTAL","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":"4-month period>Jun-Sep","cvShortName":null,"cvUnit":null,"cvWhat":"earth system variable>hydroclimatic variable>hydroclimate ratio>relative humidity"},{"cvAdditionalInfo":"computed from the Online Isotopes in Precipitation calculator (OIPC; Bowen and Revenaugh 2003)","cvDataType":"INSTRUMENTAL","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"hydrologic material>precipitation","cvMethod":null,"cvSeasonality":"4-month period>Jun-Sep","cvShortName":null,"cvUnit":"per mil","cvWhat":"chemical composition>isotope>isotope ratio>delta 2H"},{"cvAdditionalInfo":"computed from the Online Isotopes in Precipitation calculator (OIPC; Bowen and Revenaugh 2003)","cvDataType":"INSTRUMENTAL","cvDetail":null,"cvError":"unspecified margin of error","cvFormat":"Numeric","cvMaterial":"hydrologic material>precipitation","cvMethod":null,"cvSeasonality":"4-month period>Jun-Sep","cvShortName":null,"cvUnit":"per mil","cvWhat":"chemical composition>isotope>isotope ratio>delta 2H"},{"cvAdditionalInfo":"Measured lake water stable isotope data is from Sauer (1997)","cvDataType":"INSTRUMENTAL","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"hydrologic material>lake water","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil","cvWhat":"chemical composition>isotope>isotope ratio>delta 2H"},{"cvAdditionalInfo":"Measured lake water stable isotope data is from Sauer (1997)","cvDataType":"INSTRUMENTAL","cvDetail":null,"cvError":"unspecified margin of error","cvFormat":"Numeric","cvMaterial":"hydrologic material>lake water","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil","cvWhat":"chemical composition>isotope>isotope ratio>delta 2H"},{"cvAdditionalInfo":"Measured lake water stable isotope data is from Sauer (1997)","cvDataType":"INSTRUMENTAL","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"hydrologic material>lake water","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil","cvWhat":"chemical composition>isotope>isotope ratio>delta 18O"},{"cvAdditionalInfo":"Measured lake water stable isotope data is from Sauer (1997)","cvDataType":"INSTRUMENTAL","cvDetail":null,"cvError":"unspecified margin of error","cvFormat":"Numeric","cvMaterial":"hydrologic material>lake water","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil","cvWhat":"chemical composition>isotope>isotope ratio>delta 18O"},{"cvAdditionalInfo":"leaf wax C-28-C30 fatty acids vs precipitation; computed from OIPC dD data and average measured dDFA28-30","cvDataType":"INSTRUMENTAL","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil","cvWhat":"chemical composition>isotope>isotope fractionation factor>delta 2H apparent fractionation factor"},{"cvAdditionalInfo":"lake water vs precipitation","cvDataType":"INSTRUMENTAL","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil","cvWhat":"chemical composition>isotope>isotope fractionation factor>delta 2H apparent fractionation factor"},{"cvAdditionalInfo":null,"cvDataType":"INSTRUMENTAL","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":"annual","cvShortName":null,"cvUnit":"degree Celsius","cvWhat":"earth system variable>temperature variable>temperature>surface temperature"},{"cvAdditionalInfo":null,"cvDataType":"INSTRUMENTAL","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":"annual","cvShortName":null,"cvUnit":"millimeter","cvWhat":"earth system variable>hydroclimatic variable>hydroclimate rate>precipitation"}]}],"dataTableName":"Baffin2013dD","dataTableNotes":null,"earliestYear":-50,"earliestYearBP":-50,"earliestYearCE":2000,"mostRecentYear":-50,"mostRecentYearBP":-50,"mostRecentYearCE":2000,"species":[],"timeUnit":"cal yr BP"}],"siteName":"Baffin Island Lakes"}],"studyCode":null,"studyName":"Baffin Island Lakes Surface Sediment Leaf Wax Hydrogen Isotope Data","studyNotes":"Hydrogen isotope (dD) data from Baffin Island lakes, including measurements made on surface sediment leaf waxes, lake water, and precipitation. 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