First physical evidence for forested environment in the Arctic during MIS 3

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Sarala , P , Väliranta , M , Eskola , T & Vaikutiene , G 2016 , ' First physical evidence for forested environment in the Arctic during MIS 3 ' , Scientific Reports , vol. 6 , 29054 . https://doi.org/10.1038/srep29054

Title: First physical evidence for forested environment in the Arctic during MIS 3
Author: Sarala, Pertti; Väliranta, Minna; Eskola, Tiina; Vaikutiene, Giedre
Contributor: University of Helsinki, Environmental Sciences
Date: 2016-07-01
Language: eng
Number of pages: 9
Belongs to series: Scientific Reports
ISSN: 2045-2322
URI: http://hdl.handle.net/10138/166058
Abstract: Old sedimentological and geochronological records can be preserved underneath the central parts of the continental ice sheets under non-erosive, cold-based subglacial conditions. Organic deposits that predate the last deglaciation are of particular value for the information held on glacial-time climate and environmental conditions. In this study, we present multiproxy data derived from a well-preserved MIS 3 interstadial (55-25 ka ago) organic layer from inside the Arctic Circle in the Finnish Lapland. Biological proxy evidence, namely coming from aquatic plant species, indicates July temperatures as high as 14.4 degrees C, i.e. higher than those of today for the study site. Macrofossil evidence demonstrates for the first time the presence of pines accompanied by tree birch during the MIS 3 interstadial in northern Fennoscandia. These results concur with contemporary insolation model outcomes but contradict with the previous proxy-based view of open tundra conditions during the MIS 3. The data suggest that there are highly dynamic interstadial continental ice-sheet dynamics following changes in orbital forcing. Warm climate enabled the establishment of forests on exposed landscape. Moreover, we suggest that in the light of these new data, previous MIS 3 pollen data could be re-interpreted.
Subject: INTERGLACIAL-GLACIAL CYCLE
MARINE ISOTOPE STAGE-3
NORTHERN SWEDEN
FINNISH LAPLAND
ICE-FREE
NORTHEASTERN FENNOSCANDIA
WEICHSELIAN CLIMATE
POLLEN RECORDS
SEDIMENTS
FINLAND
1172 Environmental sciences
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