{"NOAAStudyId":"17175","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":"2014-09-11","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-17175.xml","doi":null,"earliestYearBP":1989,"earliestYearCE":-39,"entryId":"noaa-recon-17175","funding":[{"fundingAgency":"Natural Environment Research Council (NERC)","fundingGrant":"NE/G018863/1"},{"fundingAgency":"Swedish Research Council ","fundingGrant":"Bert Bolin Centre Linnaeus Grant, VR70454201"},{"fundingAgency":"Project Millennium ","fundingGrant":null},{"fundingAgency":"European Union","fundingGrant":"FP6 grant 017008"},{"fundingAgency":"Royal Swedish Academy  of Sciences","fundingGrant":"FOA09V-063"}],"investigators":"Melvin, T.M.; Grudd, H.; Briffa, K.R.","mostRecentYearBP":-60,"mostRecentYearCE":2010,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/17175","originalSource":null,"publication":[{"abstract":"We describe the analysis of existing and new maximum-latewood-density (MXD) and tree-ring width (TRW) data from the Torneträsk region of northern Sweden and the construction of 1500 year chronologies. Some previous work found that MXD and TRW chronologies from Torneträsk were inconsistent over the most recent 200 years, even though they both reflect predominantly summer temperature influences on tree growth. We show that this was partly a result of systematic bias in MXD data measurements and partly a result of inhomogeneous sample selection from living trees (modern sample bias). We use refinements of the simple Regional Curve Standardisation (RCS) method of chronology construction to identify and mitigate these biases. The new MXD and TRW chronologies now present a largely consistent picture of long-timescale changes in past summer temperature in this region over their full length, indicating similar levels of summer warmth in the medieval period (MWP, c. ce 900-1100) and the latter half of the 20th century. Future work involving the updating of MXD chronologies using differently sourced measurements may require similar analysis and appropriate adjustment to that described here to make the data suitable for the production of un-biased RCS chronologies. The use of 'growth-rate' based multiple RCS curves is recommended to identify and mitigate the problem of 'modern sample bias'.","author":{"name":"Thomas M. Melvin, Håkan Grudd, Keith R. Briffa"},"citation":"Thomas M. Melvin, Håkan Grudd, Keith R. Briffa. 2013. Potential bias in 'updating' tree-ring chronologies using regional curve standardisation: Re-processing 1500 years of Torneträsk density and ring-width data. The Holocene, 23(3), 364-373. doi: 10.1177/0959683612460791","edition":null,"identifier":{"id":"10.1177/0959683612460791","type":"doi","url":"http://dx.doi.org/10.1177/0959683612460791"},"issue":"3","journal":"The Holocene","pages":"364-373","pubRank":"1","pubYear":2013,"reportNumber":null,"title":"Potential bias in 'updating' tree-ring chronologies using regional curve standardisation: Re-processing 1500 years of Torneträsk density and ring-width data.","type":"publication","volume":"23"}],"reconstruction":"Y","scienceKeywords":["Air Temperature Reconstruction"],"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":"27397","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>reconstructions>air temperature"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/europe/sweden/tornetrask2013temp-mxd.txt","linkText":"Torneträsk MXD 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":"number of tree ring samples","cvDataType":"CLIMATE RECONSTRUCTIONS|TREE RING","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"count","cvWhat":"sampling metadata>number of samples"},{"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":"4-month period>May-Aug","cvShortName":null,"cvUnit":"degree Celsius","cvWhat":"earth system variable>temperature variable>temperature>surface temperature"},{"cvAdditionalInfo":"based on latewood density; calculated when sample count >4 trees","cvDataType":"CLIMATE RECONSTRUCTIONS|TREE RING","cvDetail":null,"cvError":"two standard error","cvFormat":"Numeric","cvMaterial":"reconstruction material>physical measurement>ring density","cvMethod":null,"cvSeasonality":"4-month period>May-Aug","cvShortName":null,"cvUnit":"degree Celsius","cvWhat":"earth system variable>temperature variable>temperature>surface temperature"},{"cvAdditionalInfo":"based on latewood density; 10yr low pass filter","cvDataType":"CLIMATE RECONSTRUCTIONS|TREE RING","cvDetail":"filtered","cvError":null,"cvFormat":"Numeric","cvMaterial":"reconstruction material>physical measurement>ring density","cvMethod":null,"cvSeasonality":"4-month period>May-Aug","cvShortName":null,"cvUnit":"degree Celsius","cvWhat":"earth system variable>temperature variable>temperature>surface temperature"}]}],"dataTableName":"Tornetrask2013MXDtemp","dataTableNotes":null,"earliestYear":441,"earliestYearBP":1509,"earliestYearCE":441,"mostRecentYear":2010,"mostRecentYearBP":-60,"mostRecentYearCE":2010,"species":[],"timeUnit":"AD"},{"NOAADataTableId":"27398","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>reconstructions>air temperature"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/europe/sweden/tornetrask2013temp-trw.txt","linkText":"Torneträsk TRW 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":"number of tree ring samples","cvDataType":"CLIMATE RECONSTRUCTIONS|TREE RING","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"count","cvWhat":"sampling metadata>number of samples"},{"cvAdditionalInfo":null,"cvDataType":"CLIMATE RECONSTRUCTIONS|TREE RING","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"reconstruction material>physical measurement>ring width","cvMethod":null,"cvSeasonality":"4-month period>May-Aug","cvShortName":null,"cvUnit":"degree Celsius","cvWhat":"earth system variable>temperature variable>temperature>surface temperature"},{"cvAdditionalInfo":"calculated when sample count >4 trees","cvDataType":"CLIMATE RECONSTRUCTIONS|TREE RING","cvDetail":null,"cvError":"two standard error","cvFormat":"Numeric","cvMaterial":"reconstruction material>physical measurement>ring width","cvMethod":null,"cvSeasonality":"4-month period>May-Aug","cvShortName":null,"cvUnit":"degree Celsius","cvWhat":"earth system variable>temperature variable>temperature>surface temperature"},{"cvAdditionalInfo":"10yr low pass filter","cvDataType":"CLIMATE RECONSTRUCTIONS|TREE RING","cvDetail":"filtered","cvError":null,"cvFormat":"Numeric","cvMaterial":"reconstruction material>physical measurement>ring width","cvMethod":null,"cvSeasonality":"4-month period>May-Aug","cvShortName":null,"cvUnit":"degree Celsius","cvWhat":"earth system variable>temperature variable>temperature>surface temperature"}]}],"dataTableName":"Tornetrask2013TRWtemp","dataTableNotes":null,"earliestYear":-39,"earliestYearBP":1989,"earliestYearCE":-39,"mostRecentYear":2010,"mostRecentYearBP":-60,"mostRecentYearCE":2010,"species":[],"timeUnit":"AD"}],"siteName":"Torneträsk"}],"studyCode":null,"studyName":"Torneträsk 1500 Year Tree Ring MXD and TRW Temperature Reconstructions","studyNotes":"Summer (May to August) temperature reconstructions for Torneträsk in northern Sweden derived\nusing firstly MXD measurements from 130 pine trees (Pinus sylvestris-Scots Pine) for AD 441 to 2010 \nand secondly TRW measurements from 650 pine trees for AD -39 to 2010. MXD data are derived from dry dead wood \nand living trees while the TRW data was also derived from subfossil lake material. The 10-year low pass \nchronologies are similar but the TRW has smaller error margins.\nFor further information see Melvin et al. (2012) paper. Metadata, supplementary data, computer programs and\ncode are all online at: http://www.cru.uea.ac.uk/cru/papers/melvin2012holocene/","version":"1.0","xmlId":"14824"}