noaa-recon-9955 Fennoscandia 1250 Year Height Increment Summer Temperature Reconstruction Lindholm, M.; Jalkanen, R.; Salminen, H.; Aalto, T.; Ogurtsov, M. Fennoscandia 1250 Year Height Increment Summer Temperature Reconstruction 2010-08-04 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/9955 Investigator M. Lindholm Investigator R. Jalkanen Investigator H. Salminen Investigator T. Aalto Investigator M. Ogurtsov 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 temperature,null,null,degree Celsius,Jun-Aug,climate reconstructions|tree ring,null,null,N,tree ring height increment earth science paleoclimate tree ring tree ring standardized growth index,null,average correlation coefficient,dimensionless,null,tree ring,composited,null,N,null earth science paleoclimate tree ring tree ring standardized growth index,null,one standard deviation,null,null,tree ring,composited,null,N,null earth science paleoclimate tree ring tree ring standardized growth index,null,expressed population signal,percent,null,tree ring,composited,null,N,null earth science paleoclimate climate reconstructions|tree ring number of samples,null,null,null,null,climate reconstructions|tree ring,null,null,N,null earth science paleoclimate tree ring tree ring standardized growth index,null,null,null,null,tree ring,composited,null,N,previous year position (1-year lag) earth science paleoclimate reconstructions air temperature geoscientificInformation Air Temperature Reconstruction PISY Pinus sylvestris L. Scots pine Scotch pine 668 AD 2007 AD 1282 cal yr BP -57 cal yr BP Complete 68.4667 68.5167 27.2667 27.4 260 260 Continent Europe Northern Europe Scandanavia Finland Laanila>LATITUDE 68.5>LONGITUDE 27.333 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 Lindholm, M., R. Jalkanen, H. Salminen, T. Aalto, and M.Ogurtsov 2010 The Holocene 10.1177/0959683610378875

New data have allowed us to extend a previous height-increment chronology of Scots pine (Pinus sylvestris L.) at the northern Fennoscandian timberline 817 years backwards in time, from 1561 to 745. Our final transfer model accounts for 31% of the dependent instrumental (mean June-August) temperature variance between 1908 and 2007. According to the 1263 yr long summer temperature proxy, the most severe summers were experienced in 1601, 1790 and 782. Correspondingly, the summers of 1689, 885 and 1123 were the most favourable for growth. Two drastic shifts in temperature variability were also found. The twentieth century experienced a multidecadal change as the cold 1905-1914 period was immediately followed by a warm period from 1915 to 1944. An even more prominent shift occurred in the Middle Ages, as the most severe cold spell during 1135-1164 was preceded by the warmest period only a decade earlier, during 1115-1124. The Fourier spectrum of the reconstruction shows significant concentrations of variance around 33.3, 23.3 and 11 years, and between 2.6 and 3.0 years. The wavelet spectrum was able to date several centres of fluctuating periodicities between 745 and 2007. Furthermore, daily temperature records allowed us to define the major growth forcing climatic factor in more detail than in previous response analyses. The mean temperature during a 53 day season from 14 June to 6 August produced the strongest positive growth response (r2 = 0.36). STUDY NOTES: 1250 year reconstruction of June - August temperature from height increment of Scots pine at the northern timberline in Fennoscandia. Annual height increments of 60 living Scots pine (Pinus sylvestris L.) trees from the northern timberline were measured. Data collection, preparation and measurement were carried out according to the guidelines of Aalto and Jalkanen (1998). The Laanila site is located at 68°28' - 68°31'N, 27°16' - 27°24'E, 220-310 m a.s.l., North Finland, about 80 km south of the pine tree line. The Sodankylä meteorological station is located c. 140 km from the sampling site and provides a climate record from 1908 to present. Height-increment chronology was built from samples from 152 trees. Indexing by 33% splines. A 1-year lag is built into the data table, because current height growth responds strongly to temperature of the previous summer. Mean June - August temperature at Sodankylä meteorological station was used in simple linear regression models. Final model: y = 9,4615 + 3,1389 x Calibration and verification statistics: Calibration period: 1908 – 2007 (100 years) Early period: 1908 – 1957 (50 years) Late period: 1958 – 2007 (50 years) RE = Reduction of error CE = Coefficient of efficiency Early-calibration Late-calibration Whole period (late-verification) (early-verification) R2 0.28 0.35 0.31 RE 0.33 0.219 CE 0.32 0.217

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/europe/fennoscandia2010temperature.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/europe/fennoscandia2010temperature.xls USA/NOAA DIF Version 9.8.4 2019-03-01 2019-03-01