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multiproxy reconstruction of spring temperatures in south-west Finland since 1750
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multiproxy reconstruction of spring temperatures in south-west Finland since 1750
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multiproxy reconstruction of spring temperatures in south-west Finland since 1750
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Journal Article
multiproxy reconstruction of spring temperatures in south-west Finland since 1750
2009
Overview
Spring temperatures were reconstructed by multiproxy database for south-west Finland since 1750. Proxy records used here were ice break-up in the Aurajoki River, the Baltic Sea ice extent, the plant phenological index and the annual varve thickness in the Pyhäjärvi Lake. Records were integrated into one palaeoclimate model using time-scale dependent calibration techniques. Reconstruction was verified with statistics showing a high degree of validation between the reconstructed and observed temperatures in Turku, south-west Finland. Reconstruction demonstrates that the springs have become warmer and reveals a warming trend since 1850s. Except for the period from 1750 to around 1850, the springs have been characterized as having a larger low-frequency variability, as well as by having a smaller range of annual temperature variations. Analyses of decadal variations revealed that the coldest springtimes occurred in the 1840s and 1850s and the first decade of the 19th century. Reconstruction was compared with the available meteorological series of central England, Stockholm, St. Petersburg, Uppsala and the spring-temperature reconstruction from western Norway. The effect of global solar, volcanic, greenhouse gases and aerosol forcings were examined together with the North Atlantic Oscillation (NAO) indices at local scale over the reconstructed period. Reconstructed spring-temperature changes have been related to changes in the atmospheric circulation, as indicated by the NAO (February-June).
Publisher
Dordrecht : Springer Netherlands,Springer Netherlands,Springer,Springer Nature B.V
Subject
/ Brackish
/ Climate Change/Climate Change Impacts
/ Climatic oscillations. Historical climates. Palaeoclimates
/ Climatology. Bioclimatology. Climate change
/ Earth and Environmental Science
/ England
/ Exact sciences and technology
/ Finland
/ Ice
/ lakes
/ Marine
/ Norway
/ rivers
/ Sea ice
/ Spring
/ Trends
