{"NOAAStudyId":"1003407","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":"2013-05-15","dataPublisher":"NOAA","dataType":"TREE RING","dataTypeInformation":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data/datasets/tree-ring","difMetadataLink":"http://www1.ncdc.noaa.gov/pub/data/metadata/published/paleo/dif/xml/noaa-tree-1003407.xml","doi":"https://doi.org/10.25921/fr8s-g616","earliestYearBP":1450,"earliestYearCE":500,"entryId":"noaa-tree-1003407","funding":[],"investigators":"Grudd, H.","mostRecentYearBP":-54,"mostRecentYearCE":2004,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/1003407","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},{"abstract":null,"author":{"name":"Briffa, K.R., P.D. Jones, T.S. Bartholin, D. Eckstein, F.H"},"citation":"Briffa, K.R., P.D. Jones, T.S. Bartholin, D. Eckstein, F.H. 1992. Fennoscandian summers from AD 500: temperature. Climate Dynamics, 7(3), 111-119. doi: 10.1007/BF00211153","edition":null,"identifier":{"id":"10.1007/BF00211153","type":"doi","url":"http://dx.doi.org/10.1007/BF00211153"},"issue":"3","journal":"Climate Dynamics","pages":"111-119","pubRank":"2","pubYear":1992,"reportNumber":null,"title":"Fennoscandian summers from AD 500: temperature","type":"publication","volume":"7"}],"reconstruction":"N","scienceKeywords":["PAGES Euro-Med 2k","PAGES 2k Network"],"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":"1001668","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>tree-ring"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/reconstructions/pages2k/euro-med2k/Grudd_CD_2008.txt","linkText":"Grudd_CD_2008.txt","urlDescription":"Data","variables":[]},{"NOAAKeywords":["earth science>paleoclimate>tree-ring"],"fileUrl":"https://www.ncdc.noaa.gov/paleo/study/12037","linkText":"Study ID 12037","urlDescription":"Original Data Source","variables":[]}],"dataTableName":"Torn92_Grudd","dataTableNotes":"The collection is an extension to the Briffa et al. 1992 collection until 2004 (Briffa et al. was until 1980). This dataset is about Torntraesk Tree ring data; PAGES ID, Eur_1;Correlation with temperature, positive, CRUTEM4v ;","earliestYear":500,"earliestYearBP":1450,"earliestYearCE":500,"mostRecentYear":2004,"mostRecentYearBP":-54,"mostRecentYearCE":2004,"species":[{"commonName":["Scots pine","Scotch pine"],"scientificName":"Pinus sylvestris L.","speciesCode":"PISY"}],"timeUnit":"AD"}],"siteName":"Torneträsk"}],"studyCode":null,"studyName":"Fennoscandia, 500-2004 AD, maximum latewood density, Swedish Scots pine, PAGES Euro-Med 2k Version","studyNotes":"  MXD data from Torneträsk were first published by Schweingruber et al. (1988). This original data set of 65 individual tree-series covered the time period AD 441-1980\n       and is hereafter denoted SEAL80 [WSL (Dendro Database, WSL, Switzerland. http://www.wsl.ch/dendro/dendrodb.html).  \n       Here, the MXD data is updated to AD 2004 using new samples from 35 relatively young trees. Thus, the new Torneträsk MXD data-base includes samples from a total\n       of 100 trees and covers the period AD 441–2004. Dry dead wood covers the period AD 441–1789 and living trees cover the period AD 1336–2004. No subfossil lake material is\n       included in the MXD data. In SEAL80, data for the most recent period originated entirely from old-aged trees and, as a result, tree rings from the twentieth century had a\n       much higher average cambial age than the earlier part of the record. The new data have significantly reduced the average cambial age of the tree-ring data in the twentieth\n       century. The TRW data are part of a much larger data set than the one used for MXD (Grudd et al. 2002). The TRW data are updated to AD 2004 using the same 35 trees as for MXD\n       and a total of 620 trees is now used to cover the period AD 500-2004. The sources of these data are living trees, dead dry wood and subfossil logs that were recovered from small lakes.\n","version":"1.0","xmlId":"1002810"}