Open AccessNeoglacial transition of atmospheric circulation patterns over Fennoscandia recorded in Holocene Lake Torneträsk sediments
Author(s) -
Thienemann Matthias,
Kusch Stephanie,
Vogel Hendrik,
Ritter Benedikt,
Schefuẞ Enno,
Rethemeyer Janet
Publication year - 2019
Publication title -
boreas
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.95
H-Index - 74
eISSN - 1502-3885
pISSN - 0300-9483
DOI - 10.1111/bor.12365
Subject(s) - holocene , geology , atmospheric circulation , younger dryas , holocene climatic optimum , oceanography , sedimentary rock , subarctic climate , glacial period , climatology , climate change , northern hemisphere , physical geography , geomorphology , geochemistry , geography
Atmospheric circulation over the North Atlantic has undergone significant fluctuations during the Holocene. To better constrain these changes and their impacts on the Fennoscandian subarctic, we investigated molecular and inorganic proxies as well as plant wax D/H isotopes (δ D C 28 ) in a Holocene sedimentary record from Lake Torneträsk (Sweden). These data indicate a thermal maximum c . 8100 to 6300 cal. a BP with reduced soil organic matter input, followed by a long‐term cooling trend with increasing soil erosion. δD data suggest a stable atmospheric circulation with predominance of westerly flow and North Atlantic moisture sourcing during the Early and Middle Holocene. A substantial depletion in δD followed by increased flood frequency starting at c . 5300 cal. a BP and intensifying c . 1500 cal. a BP suggests a reorganization of the atmospheric circulation from zonal towards meridional flow with predominantly Arctic Ocean and Baltic Sea moisture sourcing.