{"NOAAStudyId":"12037","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":"2010-04-01","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-12037.xml","doi":null,"earliestYearBP":1450,"earliestYearCE":500,"entryId":"noaa-recon-12037","funding":[{"fundingAgency":"European Union","fundingGrant":"EVK2-CT-2002-00136"},{"fundingAgency":"Project Millennium ","fundingGrant":"017008 GOCE"}],"investigators":"Grudd, H.","mostRecentYearBP":-54,"mostRecentYearCE":2004,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/12037","originalSource":null,"publication":[{"abstract":"This paper presents updated tree-ring width (TRW) and maximum density (MXD) \r\nfrom Torneträsk in northern Sweden, now covering the period AD 500-2004. \r\nBy including data from relatively young trees for the most recent period, \r\na previously noted decline in recent MXD is eliminated. Non-climatological \r\ngrowth trends in the data are removed using Regional Curve Standardization \r\n(RCS), thus producing TRW and MXD chronologies with preserved low-frequency\r\nvariability. The chronologies are calibrated using local and regional \r\ninstrumental climate records. A boot-strapped response function analysis \r\nusing regional climate data shows that tree growth is forced by April-August \r\ntemperatures and that the regression weights for MXD are much stronger than \r\nfor TRW. The robustness of the reconstruction equation is verified by \r\nindependent temperature data and shows that 63-64% of the instrumental \r\ninter-annual variation is captured by the tree-ring data. This is a \r\nsignificant improvement compared to previously published reconstructions\r\nbased on tree-ring data from Torneträsk. A divergence phenomenon around \r\nAD 1800, expressed as an increase in TRW that is not paralleled by \r\ntemperature and MXD, is most likely an effect of major changes in the \r\ndensity of the pine population at this northern tree-line site. The bias\r\nintroduced by this TRW phenomenon is assessed by producing a summer \r\ntemperature reconstruction based on MXD exclusively. The new data show \r\ngenerally higher temperature estimates than previous reconstructions \r\nbased on Torneträsk tree-ring data. The late-twentieth century, however,\r\nis not exceptionally warm in the new record: On decadal-to-centennial \r\ntimescales, periods around AD 750, 1000, 1400, and 1750 were equally warm, \r\nor warmer. The 200-year long warm period centered on AD 1000 was \r\nsignificantly warmer than the late-twentieth century (p < 0.05) and is \r\nsupported by other local and regional paleoclimate data. The new tree-ring \r\nevidence from Torneträsk suggests that this \"Medieval Warm Period\" in \r\nnorthern Fennoscandia was much warmer than previously recognized. \r\n\r\n","author":null,"citation":"Grudd, H. 2008. \r\nTorneträsk tree-ring width and density AD 500-2004:\r\na test of climatic sensitivity and a new 1500-year reconstruction\r\nof north Fennoscandian summers.\r\nClimate Dynamics, Vol. 31, pp. 843-857. \r\nDOI:10.1007/s00382-007-0358-2 \r\n","edition":null,"identifier":{"id":"10.1007/s00382-007-0358-2","type":"doi","url":"http://dx.doi.org/10.1007/s00382-007-0358-2"},"issue":null,"journal":"Climate Dynamics","pages":null,"pubRank":"1","pubYear":2008,"reportNumber":null,"title":"Torneträsk tree-ring width and density AD 500-2004: a test of climatic sensitivity and a new 1500-year reconstruction of north Fennoscandian summers","type":"publication","volume":null}],"reconstruction":"Y","scienceKeywords":["PAGES 2k Network","Air Temperature Reconstruction","PAGES Arctic 2k"],"site":[{"NOAASiteId":"52360","geo":{"geoType":"Feature","geometry":{"coordinates":["68.21","68.31","19.45","19.8"],"type":"POLYGON"},"properties":{"easternmostLongitude":"19.8","maxElevationMeters":"400","minElevationMeters":"400","northernmostLatitude":"68.31","southernmostLatitude":"68.21","westernmostLongitude":"19.45"}},"locationName":"Continent>Europe>Northern Europe>Scandanavia>Sweden","mappable":"Y","paleoData":[{"NOAADataTableId":"20395","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>reconstructions>air temperature"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/europe/sweden/tornetrask-temperature2008.txt","linkText":"tornetrask-temperature2008.txt","urlDescription":"Data","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":"based on latewood density","cvDataType":"CLIMATE RECONSTRUCTIONS|TREE RING","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"reconstruction material>physical measurement>ring density","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"degree Celsius","cvWhat":"earth system variable>temperature variable>temperature"},{"cvAdditionalInfo":"based on latewood density; deviation from 1951-70 mean","cvDataType":"CLIMATE RECONSTRUCTIONS|TREE RING","cvDetail":"anomalized","cvError":null,"cvFormat":"Numeric","cvMaterial":"reconstruction material>physical measurement>ring density","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"degree Celsius","cvWhat":"earth system variable>temperature variable>temperature"},{"cvAdditionalInfo":"based on latewood density; deviation from 1951-70 mean; 30-year filtered","cvDataType":"CLIMATE RECONSTRUCTIONS|TREE RING","cvDetail":"filtered","cvError":null,"cvFormat":"Numeric","cvMaterial":"reconstruction material>physical measurement>ring density","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"degree Celsius","cvWhat":"earth system variable>temperature variable>temperature"},{"cvAdditionalInfo":"based on latewood density; deviation from 1951-70 mean; 30-year filtered","cvDataType":"CLIMATE RECONSTRUCTIONS|TREE RING","cvDetail":"anomalized","cvError":null,"cvFormat":"Numeric","cvMaterial":"reconstruction material>physical measurement>ring density","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"degree Celsius","cvWhat":"earth system variable>temperature variable>temperature"},{"cvAdditionalInfo":"based on latewood density; deviation from 1951-70 mean; 100-year filtered","cvDataType":"CLIMATE RECONSTRUCTIONS|TREE RING","cvDetail":"filtered","cvError":null,"cvFormat":"Numeric","cvMaterial":"reconstruction material>physical measurement>ring density","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"degree Celsius","cvWhat":"earth system variable>temperature variable>temperature"},{"cvAdditionalInfo":"based on latewood density; deviation from 1951-70 mean; 100-year filtered","cvDataType":"CLIMATE RECONSTRUCTIONS|TREE RING","cvDetail":"anomalized","cvError":null,"cvFormat":"Numeric","cvMaterial":"reconstruction material>physical measurement>ring density","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"degree Celsius","cvWhat":"earth system variable>temperature variable>temperature"},{"cvAdditionalInfo":null,"cvDataType":"TREE RING","cvDetail":"composited","cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":null,"cvWhat":"statistical variable>proxy composite>tree ring standardized growth index"}]},{"NOAAKeywords":["earth science>paleoclimate>reconstructions>air temperature"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/europe/sweden/tornetrask-temperature2008.xls","linkText":"tornetrask-temperature2008.xls","urlDescription":"Data","variables":[]}],"dataTableName":"Torneträsk2008","dataTableNotes":null,"earliestYear":500,"earliestYearBP":1450,"earliestYearCE":500,"mostRecentYear":2004,"mostRecentYearBP":-54,"mostRecentYearCE":2004,"species":[],"timeUnit":"AD"}],"siteName":"Torneträsk"}],"studyCode":null,"studyName":"Torneträsk Tree Ring MXD Temperature Reconstruction AD 500-2004","studyNotes":"Tree ring maximum density temperature reconstruction for AD 500-2004, \nbased on a total of 100 pine trees from Torneträsk in northern Sweden.\nSample materials cover the period AD 441–2004. Dry dead wood covers \nthe period AD 441–1789 and living trees cover the period AD 1336–2004. \nNo subfossil lake material is included in the MXD data. \n\nTorneträsk area, northern Sweden (68.21-68.31°N, 19.45-19.80°E, \n350-450 m a.s.l.).\n\n","version":"1.0","xmlId":"10139"}