Finnish Lakeland 1241 Year May-September Temperature Reconstruction Helama, S.; Vartiainen, M.; Holopainen, J.; Mäkelä, H.M.; Kolström, T.; Meriläinen, J. Helama, S. Vartiainen, M. Holopainen, J. Mäkelä, H.M. Kolström, T. Meriläinen, J. Air Temperature Reconstruction 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,May-Sep,climate reconstructions|tree ring,null,null,N,based on latewood density) earth science/paleoclimate/climate reconstructions|tree ring (surface temperature,ring density,99% confidence interval upper bound,degree Celsius,May-Sep,climate reconstructions|tree ring,null,null,N,based on latewood density) earth science/paleoclimate/climate reconstructions|tree ring (surface temperature,ring density,null,degree Celsius,May-Sep,climate reconstructions|tree ring,null,null,N,based on latewood density) earth science/paleoclimate/climate reconstructions|tree ring (surface temperature,ring density,99% confidence interval lower bound,degree Celsius,May-Sep,climate reconstructions|tree ring,null,null,N,based on latewood density) earth science/paleoclimate/climate reconstructions|tree ring (surface temperature,ring density,95% confidence interval upper bound,degree Celsius,May-Sep,climate reconstructions|tree ring,null,null,N,based on latewood density) earth science/paleoclimate/reconstructions (Finnish Lakeland>LATITUDE >LONGITUDE ) X-ray based tree-ring data of maximum latewood densities (MXD) was combined for south-eastern Finland. This data originated from subfossil and modern pine (Pinus sylvestris L.) materials comprising a continuous dendroclimatic record over the past millennium. Calibrating and verifying the MXD chronologies against the instrumental temperature data showed a promising opportunity to reconstruct warm-season (May through September) temperature variability. A new palaeotemperature record correlated statistically significantly with the long instrumental temperature records in the region and adjacent areas since the 1740s. Comparisons with tree-ring based (MXD and tree-ring width) reconstructions from northern Fennoscandia and northern Finland exhibited consistent summer temperature variations through the Medieval Climate Anomaly, Little Ice Age, and the 20th century warmth. A culmination of the LIA cooling during the early 18th century appeared consistently with the Maunder Minimum, when the solar activity was drastically reduced. A number of coolest reconstructed events between AD 1407 and 1902 were coeval to years of crop failure and famine as documented in the agro-historical chronicles. Results indicate an encouraging possibility of warm-season temperature reconstructions using middle/south boreal tree-ring archives to detail and enhance the understanding of past interactions between humans, ecosystems and the earth. STUDY NOTES: Finnish Lakeland summer temperature reconstruction over the last millennium based on a maximum latewood density of subfossil and modern tree rings. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Helama, S. Investigator : Vartiainen, M. Investigator : Holopainen, J. Investigator : Mäkelä, H.M. Investigator : Kolström, T. Investigator : Meriläinen, J. 2014-07-04 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/16790 https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/europe/finland/lakeland2014.txt https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/europe/finland/lakeland2014.txt English https://www.ncdc.noaa.gov/paleo/study/16790 https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/europe/finland/lakeland2014.txt Samuli Helama, Matti Vartiainen, Jari Holopainen, Hanna M. Mäkelä, Taneli Kolström, Jouko Meriläinen2014A palaeotemperature record for the Finnish Lakeland based on microdensitometric variations in tree ringsGeochronometria413265-27710.2478/s13386-013-0163-0http://link.springer.com/article/10.2478/s13386-013-0163-0#page-1 START YEAR: 760 AD * END YEAR: 2000 AD 25.48 61.8 31.17 62.85