noaa-recon-17264 Northern Fennoscandia 2000 Year June-July Temperature Reconstruction Matskovsky, V.V.; Helama, S. Northern Fennoscandia 2000 Year June-July Temperature Reconstruction 2014-09-29 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/17264 Investigator V.V. Matskovsky Investigator S. Helama earth science paleoclimate climate reconstructions|tree ring age,null,null,year Common Era,null,climate reconstructions|tree ring,null,null,N,null earth science paleoclimate climate reconstructions|tree ring surface temperature,ring density,95% confidence interval lower bound,degree Celsius,Jun-Jul,climate reconstructions|tree ring,null,null,N,based on latewood density; bootstrap; error #1 - The uncertainty of replication by the regional curve earth science paleoclimate climate reconstructions|tree ring surface temperature,ring density,95% confidence interval upper bound,degree Celsius,Jun-Jul,climate reconstructions|tree ring,null,null,N,based on latewood density; bootstrap; error #1 - The uncertainty of replication by the regional curve earth science paleoclimate climate reconstructions|tree ring surface temperature,ring density,null,degree Celsius,Jun-Jul,climate reconstructions|tree ring,null,null,N,based on latewood density; RCS-based (RC2SFC) earth science paleoclimate climate reconstructions|tree ring surface temperature,ring density,95% confidence interval upper bound,degree Celsius,Jun-Jul,climate reconstructions|tree ring,null,null,N,based on latewood density; bootstrap; error #2 - The uncertainty of replication by the mean chronology earth science paleoclimate climate reconstructions|tree ring surface temperature,ring density,95% confidence interval upper bound,degree Celsius,Jun-Jul,climate reconstructions|tree ring,null,null,N,based on latewood density; bootstrap; error #3 - The uncertainty from calibration earth science paleoclimate climate reconstructions|tree ring surface temperature,ring density,95% confidence interval lower bound,degree Celsius,Jun-Jul,climate reconstructions|tree ring,null,null,N,based on latewood density; bootstrap; error #3 - The uncertainty from calibration earth science paleoclimate climate reconstructions|tree ring surface temperature,ring density,95% confidence interval lower bound,degree Celsius,Jun-Jul,climate reconstructions|tree ring,null,null,N,based on latewood density; bootstrap; error #2 - The uncertainty of replication by the mean chronology earth science paleoclimate reconstructions air temperature geoscientificInformation Air Temperature Reconstruction -7 AD 2010 AD 1957 cal yr BP -60 cal yr BP Complete 66.8 69.5 19.75 29 330 330 Continent Europe Northern Europe Scandanavia Northern Fennoscandia>LATITUDE >LONGITUDE None 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. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII Matskovsky, V.V. and S. Helama 2014 Climate of the Past 10 4 1473-1487 10.5194/cp-10-1473-2014 http://www.clim-past.net/10/1473/2014/cp-10-1473-2014.html

Here we analyse the maximum latewood density (MXD) chronologies of two published tree-ring data sets: one from Tornetrask region in northernmost Sweden (TORN; Melvin et al., 2013) and one from northern Fennoscandia (FENN; Esper et al., 2012). We paid particular attention to the MXD low-frequency variations to reconstruct summer (June-August, JJA) long-term temperature history. We used published methods of tree-ring standardization: regional curve standardization (RCS) combined with signal-free implementation. Comparisons with RCS chronologies produced using single and multiple (non-climatic) ageing curves (to be removed from the initial MXD series) were also carried out. We develop a novel method of standardization, the correction implementation of signal-free standardization, tailored for detection of pure low-frequency signal in tree-ring chronologies. In this method, the error in RCS chronology with signal-free implementation is analytically assessed and extracted to produce an advanced chronology. The importance of correction becomes obvious at lower frequencies as smoothed chronologies become progressively more correlative with correction implementation. Subsampling the FENN data to mimic the lower chronology sample size of TORN data shows that the chronologies bifurcate during the 7th, 9th, 17th and 20th centuries. We used the two MXD data sets to reconstruct summer temperature variations over the period 8 BC through AD 2010. Our new reconstruction shows multi-decadal to multi-centennial variability with changes in the amplitude of the summer temperature of 2.2C on average during the Common Era. Although the MXD data provide palaeoclimate research with a highly reliable summer temperature proxy, the bifurcating dendroclimatic signals identified in the two data sets imply that future research should aim at a more advanced understanding of MXD data on distinct issues: (1) influence of past population density variations on MXD production, (2) potential biases when calibrating differently produced MXD data to produce one proxy record, (3) influence of the biological age of MXD data when introducing young trees into the chronology over the most recent past and (4) possible role of waterlogging in MXD production when analysing tree-ring data of riparian trees. STUDY NOTES: Northern Fennoscandia June-July temperature reconstruction over the last two millennia based on a maximum latewood density of subfossil and modern tree rings

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/europe/fennoscandia2014temperature.txt Text Data File; Northern Fennoscandia 2000 Year June-July Temperature Reconstruction USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11