{"NOAAStudyId":"13644","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":"2012-12-19","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-13644.xml","doi":null,"earliestYearBP":843,"earliestYearCE":1107,"entryId":"noaa-recon-13644","funding":[{"fundingAgency":"Project Millennium ","fundingGrant":"017008 GOCE"}],"investigators":"Gunnarson, B.E.; Linderholm, H.W.; Moberg, A.","mostRecentYearBP":-57,"mostRecentYearCE":2007,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/13644","originalSource":null,"publication":[{"abstract":"Dendroclimatological sampling of Scots pine (Pinus sylvestris L.) has been made in the province of Jämtland, in the west-central Scandinavian mountains, since the 1970s. The tree-ring width (TRW) chronology spans several thousand years and has been used to reconstruct June-August temperatures back to 1632 bc. A maximum latewood density (MXD) dataset, covering the period ad 1107-1827 (with gap 1292-1315) was presented in the 1980s by Fritz Schweingruber. Here we combine these historical MXD data with recently collected MXD data covering ad 1292-2006 into a single reconstruction of April-September temperatures for the period ad 1107-2006. Regional curve standardization (RCS) provides more low-frequency variability than “non-RCS” and stronger correlation with local seasonal temperatures (51% variance explained). The MXD chronology shows a stronger relationship with temperatures than the TRW data, but the two chronologies show similar multi-decadal variations back to ad 1500. According to the MXD chronology, the period since ad 1930 and around ad 1150-1200 were the warmest during the last 900 years. Due to large uncertainties in the early part of the combined MXD chronology, it is not possible to conclude which period was the warmest. More sampling of trees growing near the tree-line is needed to further improve the MXD chronology.","author":null,"citation":"Björn E. Gunnarson, Hans W. Linderholm, and Anders Moberg. 2011. Improving a tree-ring reconstruction from west-central Scandinavia: 900 years of warm-season temperatures. \r\nClimate Dynamics, Vol. 36, Issues 1-2, pp. 97-108.\r\nDOI:  10.1007/s00382-010-0783-5","edition":null,"identifier":{"id":"10.1007/s00382-010-0783-5","type":"doi","url":"http://dx.doi.org/10.1007/s00382-010-0783-5"},"issue":null,"journal":"Climate Dynamics","pages":null,"pubRank":"1","pubYear":2011,"reportNumber":null,"title":"Improving a tree-ring reconstruction from west-central Scandinavia: 900 years of warm-season temperatures","type":"publication","volume":null}],"reconstruction":"Y","scienceKeywords":["Air Temperature Reconstruction"],"site":[{"NOAASiteId":"54286","geo":{"geoType":"Feature","geometry":{"coordinates":["62.21","62.31","13.15","13.6"],"type":"POLYGON"},"properties":{"easternmostLongitude":"13.6","maxElevationMeters":"670","minElevationMeters":"670","northernmostLatitude":"62.31","southernmostLatitude":"62.21","westernmostLongitude":"13.15"}},"locationName":"Continent>Europe>Northern Europe>Scandanavia>Sweden","mappable":"N","paleoData":[{"NOAADataTableId":"23314","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>reconstructions>air temperature"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/europe/sweden/gunnarson2011mxd.txt","linkText":"gunnarson2011mxd.txt","urlDescription":"Data","variables":[{"cvAdditionalInfo":null,"cvDataType":"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":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"},{"cvAdditionalInfo":"30 year spline","cvDataType":"TREE RING","cvDetail":"smoothed","cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":null,"cvWhat":"statistical variable>proxy composite>tree ring standardized growth index"},{"cvAdditionalInfo":"30 year spline","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"}]}],"dataTableName":"gunnarson2011mxd","dataTableNotes":null,"earliestYear":1290,"earliestYearBP":660,"earliestYearCE":1290,"mostRecentYear":2006,"mostRecentYearBP":-56,"mostRecentYearCE":2006,"species":[],"timeUnit":"AD"},{"NOAADataTableId":"23315","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>reconstructions>air temperature"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/europe/sweden/gunnarson2011temp.txt","linkText":"gunnarson2011temp.txt","urlDescription":"Data","variables":[{"cvAdditionalInfo":"based on latewood density; RCS method 30-yr filtered","cvDataType":"CLIMATE RECONSTRUCTIONS|TREE RING","cvDetail":"filtered","cvError":null,"cvFormat":"Numeric","cvMaterial":"reconstruction material>physical measurement>ring density","cvMethod":null,"cvSeasonality":"6-month period>Apr-Sep","cvShortName":null,"cvUnit":"degree Celsius","cvWhat":"earth system variable>temperature variable>temperature>surface temperature"},{"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; RCS method","cvDataType":"CLIMATE RECONSTRUCTIONS|TREE RING","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"reconstruction material>physical measurement>ring density","cvMethod":null,"cvSeasonality":"6-month period>Apr-Sep","cvShortName":null,"cvUnit":"degree Celsius","cvWhat":"earth system variable>temperature variable>temperature>surface temperature"},{"cvAdditionalInfo":"based on latewood density; RCS method; Spline 30 yr","cvDataType":"CLIMATE RECONSTRUCTIONS|TREE RING","cvDetail":null,"cvError":"one standard error lower bound","cvFormat":"Numeric","cvMaterial":"reconstruction material>physical measurement>ring density","cvMethod":null,"cvSeasonality":"6-month period>Apr-Sep","cvShortName":null,"cvUnit":"degree Celsius","cvWhat":"earth system variable>temperature variable>temperature>surface temperature"},{"cvAdditionalInfo":"based on latewood density; RCS method; Spline 30 yr","cvDataType":"CLIMATE RECONSTRUCTIONS|TREE RING","cvDetail":null,"cvError":"one standard error upper bound","cvFormat":"Numeric","cvMaterial":"reconstruction material>physical measurement>ring density","cvMethod":null,"cvSeasonality":"6-month period>Apr-Sep","cvShortName":null,"cvUnit":"degree Celsius","cvWhat":"earth system variable>temperature variable>temperature>surface temperature"},{"cvAdditionalInfo":"based on latewood density; non-RCS method","cvDataType":"CLIMATE RECONSTRUCTIONS|TREE RING","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"reconstruction material>physical measurement>ring density","cvMethod":null,"cvSeasonality":"6-month period>Apr-Sep","cvShortName":null,"cvUnit":"degree Celsius","cvWhat":"earth system variable>temperature variable>temperature>surface temperature"},{"cvAdditionalInfo":"based on latewood density; non-RCS 30-yr filtered","cvDataType":"CLIMATE RECONSTRUCTIONS|TREE RING","cvDetail":"filtered","cvError":null,"cvFormat":"Numeric","cvMaterial":"reconstruction material>physical measurement>ring density","cvMethod":null,"cvSeasonality":"6-month period>Apr-Sep","cvShortName":null,"cvUnit":"degree Celsius","cvWhat":"earth system variable>temperature variable>temperature>surface temperature"},{"cvAdditionalInfo":"based on latewood density; non-RCS method; Spline 30 year","cvDataType":"CLIMATE RECONSTRUCTIONS|TREE RING","cvDetail":null,"cvError":"one standard error lower bound","cvFormat":"Numeric","cvMaterial":"reconstruction material>physical measurement>ring density","cvMethod":null,"cvSeasonality":"6-month period>Apr-Sep","cvShortName":null,"cvUnit":"degree Celsius","cvWhat":"earth system variable>temperature variable>temperature>surface temperature"},{"cvAdditionalInfo":"based on latewood density; non-RCS method; Spline 30 year","cvDataType":"CLIMATE RECONSTRUCTIONS|TREE RING","cvDetail":null,"cvError":"one standard error upper bound","cvFormat":"Numeric","cvMaterial":"reconstruction material>physical measurement>ring density","cvMethod":null,"cvSeasonality":"6-month period>Apr-Sep","cvShortName":null,"cvUnit":"degree Celsius","cvWhat":"earth system variable>temperature variable>temperature>surface temperature"}]}],"dataTableName":"gunnarson2011temp","dataTableNotes":null,"earliestYear":1107,"earliestYearBP":843,"earliestYearCE":1107,"mostRecentYear":2007,"mostRecentYearBP":-57,"mostRecentYearCE":2007,"species":[],"timeUnit":"AD"}],"siteName":"Jämtland"}],"studyCode":null,"studyName":"Jämtland 900 Year Tree Ring MXD Temperature Reconstruction","studyNotes":"Tree ring maximum density temperature reconstruction for AD 1100-2006\nbased on a combination of old historical data and new data.\nDry dead wood covers the period AD 1107-1907 and living trees cover the period AD 1450-2006. \nNo subfossil lake material is included in the MXD data. \n ","version":"1.0","xmlId":"11665"}