{"NOAAStudyId":"20930","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":"2016-11-21","dataPublisher":"NOAA","dataType":"CLIMATE RECONSTRUCTIONS","dataTypeInformation":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data/datasets/climate-reconstruction","difMetadataLink":"http://www1.ncdc.noaa.gov/pub/data/metadata/published/paleo/dif/xml/noaa-recon-20930.xml","doi":null,"earliestYearBP":170,"earliestYearCE":1780,"entryId":"noaa-recon-20930","funding":[{"fundingAgency":"Natural Sciences and Engineering Research Council of Canada","fundingGrant":"Discovery Grant"}],"investigators":"Porter, T.J.; Pisaric, M.","mostRecentYearBP":-53,"mostRecentYearCE":2003,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/20930","originalSource":null,"publication":[{"abstract":"High-latitude d18O archives deriving from meteoric water (e.g., tree-rings and ice-cores) can provide valuable information on past temperature variability, but stationarity of temperature signals in these archives depends on the stability of moisture source/trajectory and precipitation seasonality, both of which can be affected by atmospheric circulation changes. A tree-ring d18O record (AD 1780-2003) from the Mackenzie Delta is evaluated as a temperature proxy based on linear regression diagnostics. The primary source of moisture for this region is the North Pacific and, thus, North Pacific atmospheric circulation variability could potentially affect the tree-ring d18O-temperature signal. Over the instrumental period (AD 1892-2003), tree-ring d18O explained 29% of interannual variability in April-July minimum temperatures, and the explained variability increases substantially at lower-frequencies. A split-period calibration/verification analysis found the d18O-temperature relation was time-stable, which supported a temperature reconstruction back to AD 1780. The stability of the d18O-temperature signal indirectly implies the study region is insensitive to North Pacific circulation effects, since North Pacific circulation was not constant over the calibration period. Simulations from the NASA-GISS ModelE isotope-enabled general circulation model confirm that meteoric d18O and precipitation seasonality in the study region are likely insensitive to North Pacific circulation effects, highlighting the paleoclimatic value of tree-ring and possibly other d18O records from this region. Our d18O-based temperature reconstruction is the first of its kind in northwestern North America, and one of few worldwide, and provides a long-term context for evaluating recent climate warming in the Mackenzie Delta region.","author":{"name":"Trevor J. Porter, Michael F.J. Pisaric, Robert D. Field, Steven V. Kokelj, Thomas W.D. Edwards, Peter deMontigny, Richard Healy, Allegra N. LeGrande"},"citation":"Trevor J. Porter, Michael F.J. Pisaric, Robert D. Field, Steven V. Kokelj, Thomas W.D. Edwards, Peter deMontigny, Richard Healy, Allegra N. LeGrande. 2014. Spring-summer temperatures since AD 1780 reconstructed from stable oxygen isotope ratios in white spruce tree-rings from the Mackenzie Delta, northwestern Canada. Climate Dynamics, 42(3), 771-785. doi: 10.1007/s00382-013-1674-3","edition":null,"identifier":{"id":"10.1007/s00382-013-1674-3","type":"doi","url":"http://dx.doi.org/10.1007/s00382-013-1674-3"},"issue":"3","journal":"Climate Dynamics","pages":"771-785","pubRank":"1","pubYear":2014,"reportNumber":null,"title":"Spring-summer temperatures since AD 1780 reconstructed from stable oxygen isotope ratios in white spruce tree-rings from the Mackenzie Delta, northwestern Canada","type":"publication","volume":"42"}],"reconstruction":"Y","scienceKeywords":["Air Temperature Reconstruction"],"site":[{"NOAASiteId":"56878","geo":{"geoType":"Feature","geometry":{"coordinates":["68.12","69.13","-135.52","-132.22"],"type":"POLYGON"},"properties":{"easternmostLongitude":"-132.22","maxElevationMeters":"5","minElevationMeters":"5","northernmostLatitude":"69.13","southernmostLatitude":"68.12","westernmostLongitude":"-135.52"}},"locationName":"Continent>North America>Canada>Northwest Territories","mappable":"N","paleoData":[{"NOAADataTableId":"31624","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>reconstructions>air temperature"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/northamerica/canada/mackenzie2014iso-temp.txt","linkText":"Mackenzie Delta Spring-Summer Temperature Reconstruction ","urlDescription":"Data File","variables":[{"cvAdditionalInfo":null,"cvDataType":"CLIMATE RECONSTRUCTIONS|TREE RING","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"year Common Era","cvWhat":"age variable>age"},{"cvAdditionalInfo":"1 standard error = +/- 1.24 deg C; cellulose delta 18O; simple linear regression","cvDataType":"CLIMATE RECONSTRUCTIONS|TREE RING","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"reconstruction material>isotope ratio>delta 18O","cvMethod":"regression analysis","cvSeasonality":"4-month period>Apr-Jul","cvShortName":null,"cvUnit":"degree Celsius","cvWhat":"earth system variable>temperature variable>minimum temperature>minimum surface temperature"},{"cvAdditionalInfo":"Environment Canada climate data","cvDataType":"INSTRUMENTAL","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":"4-month period>Apr-Jul","cvShortName":null,"cvUnit":"degree Celsius","cvWhat":"earth system variable>temperature variable>minimum temperature>minimum surface temperature"},{"cvAdditionalInfo":null,"cvDataType":"TREE RING","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"chemical composition>compound>organic compound>organooxygen compound>cellulose","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil","cvWhat":"chemical composition>isotope>isotope ratio>delta 18O"}]}],"dataTableName":"Mackenzie2014IsoTemp","dataTableNotes":null,"earliestYear":1780,"earliestYearBP":170,"earliestYearCE":1780,"mostRecentYear":2003,"mostRecentYearBP":-53,"mostRecentYearCE":2003,"species":[],"timeUnit":"AD"}],"siteName":"Mackenzie Delta"}],"studyCode":null,"studyName":"Mackenzie Delta, NW Canada 220 Year Spring-Summer Temperature Reconstruction","studyNotes":"Spring-summer temperatures since AD 1780 reconstructed from stable oxygen isotope ratios in white spruce tree-rings from the Mackenzie Delta, northwestern Canada.","version":"1.0","xmlId":"18827"}