noaa-lake-13119 Fennoscandia 7500Yr Pollen-TreeRing July Temperature Reconstructions Helama, S.; Seppä, H.; Bjune, A.E.; Birks, H.J.B. Fennoscandia 7500Yr Pollen-TreeRing July Temperature Reconstructions 2012-06-30 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/13119 Investigator S. Helama Investigator H. Seppä Investigator A.E. Bjune Investigator H.J.B. Birks earth science paleoclimate climate reconstructions|pollen|tree ring temperature,null,null,degree Celsius,Jul,climate reconstructions|pollen|tree ring,anomalized,null,N,anomalized from 1950-2000 mean earth science paleoclimate climate reconstructions|pollen|tree ring age,null,null,year Common Era,null,climate reconstructions|pollen|tree ring,null,null,N,null earth science paleoclimate climate reconstructions|tree ring temperature,null,null,degree Celsius,Jul,climate reconstructions|tree ring,null,null,N,null earth science paleoclimate paleolimnology reconstruction geoscientificInformation Air Temperature Reconstruction PAGES 2k Network PAGES Arctic 2k -5500 AD 2005 AD 7450 cal yr BP -55 cal yr BP Complete 66.42 70.83 14.05 35.32 Continent Europe Northern Europe Scandanavia 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 Helama, S., H. Seppä, A.E. Bjune, and H.J.B. Birks. 2012. Fusing pollen-stratigraphic and dendroclimatic proxy data to reconstruct summer temperature variability during the past 7.5 ka in subarctic Fennoscandia. Journal of Paleolimnology, Vol. 48, No. 1, June 2012, pp. 275-286. DOI: 10.1007/s10933-012-9598-1

A new palaeoclimatic reconstruction of mid-summer (July) temperatures for the last 7.5 ka in northern Fennoscandia is presented. It is based on two botanical proxies: spectra of fossil pollen and tree rings of Scots pine logs recovered from lacustrine sediments in the Arctic tree-line region. A newly developed method of proxy fusion is used to integrate the proxy-specific reconstructions of past summer temperature variability based on the pollen-stratigraphic and dendroclimatic data. The rationale behind the method is that the two proxies are likely to be connected to climate variability in a timescale-dependent fashion and, accordingly, the new reconstruction makes use of the low- and high-frequencies from pollen-stratigraphic and tree-ring data, respectively. The most prominent features of the new reconstruction are: (1) the long-term decline of temperatures by 2.0°C over the past 7.5 ka, (2) the mid-Holocene warmth culminating between 5 and 4 ka as a deviation from the cooling trend, (3) the Little Ice Age cool phase between 0.7 and 0.1 ka, and (4) the subsequent warming during the past century. These periods are superimposed on year-to-year variations in climate as dated to calendar-year accuracy by dendrochronology. Within the modern period, the years 1934 and 1937 are among the warmest, and the years 1903 and 1910 are among the coldest summers in the context of the past 7.5 ka. On average, the reconstructed Holocene climate was approximately 0.85°C warmer than the twentieth century. STUDY NOTES: Pollen data from 11 lakes in northern Fennoscandia, plus July pollen/tree-ring temperature reconstruction for the past 7500 years. Northern Fennoscandia: ~66°-70°N, ~14°-35°E

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/fennoscandia2012temperature.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/fennoscandia2012temperature.xls USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11