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Holocene environmental history of the Ångermanälven Estuary, northern Baltic Sea
University of Pennsylvania, Indiana, PA, USA.
Christian-Albrechts-University, Kiel, Germany.
University of Hamburg, Hamburg, Germany.
University of Hamburg, Hamburg, Germany.
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2018 (English)In: Boreas, ISSN 0300-9483, E-ISSN 1502-3885, Vol. 47, no 2, p. 593-608Article in journal (Refereed) Published
Abstract [en]

The Baltic Sea has experienced a complex geological history, with notable swings in salinity driven by changes to its connection with the Atlantic and glacio-isostatic rebound. Sediments obtained during International Ocean Drilling Program Expedition 347 allow the study of the effects of these changes on the ecology of the Baltic in high resolution through the Holocene in areas where continuous records had not always been available. Sites M0061 and M0062, drilled in the Ångermanälven Estuary (northern Baltic Sea), contain records of Holocene-aged sediments and microfossils. Here we present detailed records of palaeoecological and palaeoenvironmental changes to the Ångermanälven Estuary inferred from diatom, palynomorph and organic-geochemical data. Based on diatom assemblages, the record is divided into four zones that comprise the Ancylus Lake, Littorina Sea, Post-Littorina Sea and Recent Baltic Sea stages. The Ancylus Lake phase is initially characterized as oligotrophic, with the majority of primary productivity in the upper water column. This transition to a eutrophic state continues into the Initial Littorina Sea stage. The Initial Littorina Sea stage contains the most marine phase recorded here, as well as low surface water temperatures. These conditions end before the Littorina Sea stage, which is marked by a return to oligotrophic conditions and warmer waters of the Holocene Thermal Maximum. Glacio-isostatic rebound leads to a shallowing of the water column, allowing for increased benthic primary productivity and stratification of the water column. The Medieval Climate Anomaly is also identified within Post-Littorina Sea sediments. Modern Baltic sediments and evidence of human-induced eutrophication are seen. Human influence upon the Baltic Sea begins c. 1700 cal. a BP and becomes more intense c. 215 cal. a BP.

 

Place, publisher, year, edition, pages
2018. Vol. 47, no 2, p. 593-608
National Category
Earth and Related Environmental Sciences
Research subject
Environmental Studies
Identifiers
URN: urn:nbn:se:sh:diva-33375DOI: 10.1111/bor.12281ISI: 000428369500015Scopus ID: 2-s2.0-85029216223Local ID: 2207/3.1.1/2014OAI: oai:DiVA.org:sh-33375DiVA, id: diva2:1140725
Projects
Senpleistocen och Holocen klimatpåverkan på Östersjön
Funder
The Foundation for Baltic and East European StudiesGerman Research Foundation (DFG), KO 3944/6-1German Research Foundation (DFG), BA 3841/5-1
Note

Also funded by IODP PEA.

Available from: 2017-09-13 Created: 2017-09-13 Last updated: 2018-04-23Bibliographically approved

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Andrén, Elinor

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