Northeastern Fennoscandia 2,000 Year Pollen Data and Inferred Summer Temperature Bjune, A.E.; Seppä, H.; Birks, H.J.B. Bjune, A.E. Seppä, H. Birks, H.J.B. Air Temperature Reconstruction PAGES 2k Network PAGES Arctic 2k earth science/paleoclimate/climate reconstructions|pollen (depth,null,null,centimeter,null,climate reconstructions|pollen,null,null,N,null) earth science/paleoclimate/climate reconstructions|pollen (surface temperature,null,null,degree Celsius,Jul,climate reconstructions|pollen,null,null,N,null) earth science/paleoclimate/climate reconstructions|pollen (age,null,null,calendar year before present,null,climate reconstructions|pollen,null,null,N,null) earth science/paleoclimate/paleolimnology (Bjornfjelltjorn>LATITUDE 68.433>LONGITUDE 18.066) Quantitative reconstructions of mean July temperatures (T (jul)) based on new and previously published pollen-stratigraphical data covering the last 2000 years from 11 lakes in northern Fennoscandia and the Kola Peninsula are presented. T (jul) values are based on a previously published pollen-climate transfer function for the region with a root-mean-square error of prediction (RMSEP) of 0.99A degrees C. The most obvious trend in the inferred temperatures from all sites is the general decrease in T (jul) during the last 2000 years. Pollen-inferred T (jul) values on average 0.18 +/- 0.56 degrees C (n = 91) higher than present (where "present" refers to the last three decades based on pollen-inferred T (jul) in core-top samples) are indicated between 0 and 1100 AD (2000-850 cal year BP), and temperatures -0.2 +/- 0.47 degrees C (n = 78) below present are inferred between 1100 and 1900 AD (850-50 cal year BP). No consistent temperature peak is observed during the 'Medieval Warm Period', ca. 900-1200 AD (1100-750 cal year BP), but the cooler period between 1100 and 1900 AD (850-50 cal year BP) corresponds in general with the 'Little Ice Age' (LIA). Consistently with independent stable isotopic data, the composite pollen-based record suggests that the coldest periods of the LIA date to 1500-1600 AD (450-350 cal year BP) and 1800-1850 AD (150-100 cal year BP). An abrupt warming occurred at about 1900 AD and the twentieth century is the warmest century since about 1000 AD (950 cal year BP). STUDY NOTES: Pollen counts and inferred summer temperature in for 11 lakes in northeastern Fennoscandia. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Bjune, A.E. Investigator : Seppä, H. Investigator : Birks, H.J.B. 2008-11-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/6193 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/fennoscandia2008pollen.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/fennoscandia2008pollen.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/fennoscandia2008pollen.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/fennoscandia2008pollen.txt English https://www.ncdc.noaa.gov/paleo/study/6193 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/fennoscandia2008pollen.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/fennoscandia2008pollen.txt Bjune, AE; Seppa, H; Birks, HJB;2009Quantitative summer-temperature reconstructions for the last 2000 years based on pollen-stratigraphical data from northern FennoscandiaJournal of Paleolimnology41143-5610.1007/s10933-008-9254-y START YEAR: 2071 cal yr BP * END YEAR: -45 cal yr BP 18.066 68.433 18.066 68.433