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author 1Samuli Helama. Natural Resources Institute Finland, P.O. Box 16, 96301 Rovaniemi, Finland.

Samuli Helama is a geoscientist with special interest in time-series of annually resolved natural archives and documentary evidence, especially tree-ring chronologies and climatic records. Originally trained as Quaternary geologist, later completing his PhD thesis (University of Helsinki, 2004) on dendrochronology, studying mid and late Holocene tree-ring chronologies as indicators of past climate variability, he is interested in analyzing proxy records of various types in paleoecologic and paleoclimatic contexts. In addition to tree rings, these data include sedimentary records of microfossils, annual shell growth increments, varves, and historical (written) evidence of past environmental changes. He is currently working in a dendroisotope project (QUANOMAL; Quantifying the Past – Environmental anomalies through multi-proxy tree-ring analyses) funded by the Academy of Finland, at the Natural Resources Institute Finland, in Rovaniemi.


author 2Tomi P. Luoto. Division of Aquatic Sciences, Department of Biological and Environmental Science, University of Jyvaskyla, P.O. Box 35, 40014, Finland.

Tomi Luoto is a paleolimnologist with a special interest in reconstructing paleoclimate and past environmental conditions in lakes using modeling approaches. He received his PhD degree in Geology in 2010. His current research focus on biogeochemical cycling and landscape dynamics in the Arctic. He also works in several lake management projects using paleolimnological methods to assess ecological and limnological baseline conditions to set targets for restoration efforts in boreal lakes.


author 3Liisa Nevalainen. Division of Aquatic Sciences, Department of Biological and Environmental Science, University of Jyvaskyla, P.O. Box 35, 40014, Finland.

Liisa Nevalainen is a Senior Lecturer of Aquatic Sciences in Department of Biological and Environmental Science, University of Jyväskylä. She is a paleolimnologist and aquatic ecologist with a research focus in understanding lake ecosystem dynamics and lake-catchment coupling processes under natural climate fluctuations and anthropogenic disturbances. She is interested in Holocene-Anthropocene scale changes and boreal, arctic and alpine biomes.


author 4Johannes Edvardsson. Quaternary Sciences, Department of Geology, Lund University, Sölvegatan 12, SE-223 62 Lund, Sweden.

Johannes Edvardsson is a dendrochronologist and geoscientist with solid history in tree-ring research, climate reconstructions, palaeohydrology, and peatland development. He received his PhD thesis at the Department of Geology, Lund University, Sweden, in March 2013. In his PhD thesis he examined hydroclimatic changes during the Holocene using subfossil peatland trees and stratigraphic records from Swedish peatlands. Johannes Edvardsson continued his hydroclimatic research using subfossil trees from the Baltic region during his three years postdoc employment at the Swiss Tree-Ring Laboratory, Bern University in Switzerland. As a complement to basic tree-ring width data he also has been working with stable isotopes in tree rings and has experience from working with non-invasive analysis of wooden objects, an important aspect when examining art objects. Apart from climatic studies, Johannes Edvardsson has been using tree-ring data to date Flemish 17th Century paintings on oak panels, standing constructions, and archaeological material. 

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