Anthropogenic and climatic impacts on a coastal environment in the Baltic Sea over the last 1000 years

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http://hdl.handle.net/10138/312113

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Ning , W , Nielsen , A B , Norbäck Ivarsson , L , Jilbert , T S , Åkesson , C , Slomp , C P , Andren , E , Broström , A & Filipsson , H L 2018 , ' Anthropogenic and climatic impacts on a coastal environment in the Baltic Sea over the last 1000 years ' , Anthropocene , vol. 21 , pp. 66-79 . https://doi.org/10.1016/j.ancene.2018.02.003

Title: Anthropogenic and climatic impacts on a coastal environment in the Baltic Sea over the last 1000 years
Author: Ning, Wenxin; Nielsen, Anne Birgitte; Norbäck Ivarsson, Lena; Jilbert, Thomas Stephen; Åkesson, Christine; Slomp, Caroline P.; Andren, Elinor; Broström, Anne; Filipsson, Helena L.
Contributor organization: Helsinki Institute of Sustainability Science (HELSUS)
Aquatic Biogeochemistry Research Unit (ABRU)
Environmental Sciences
Marine Ecosystems Research Group
Date: 2018-03
Language: eng
Number of pages: 14
Belongs to series: Anthropocene
ISSN: 2213-3054
DOI: https://doi.org/10.1016/j.ancene.2018.02.003
URI: http://hdl.handle.net/10138/312113
Abstract: Coastal environments have experienced large ecological changes as a result of human activities over the last 100-200 years. To understand the severity and potential consequences of such changes, paleoenvironmental records provide important contextual information. The Baltic Sea coastal zone is naturally a vulnerable system and subject to significant human-induced impacts. To put the recent environmental degradation in the Baltic coastal zone into a long-term perspective, and to assess the natural and anthropogenic drivers of environmental change, we present sedimentary records covering the last 1000 years obtained from a coastal inlet (Gasfjarden) and a nearby lake (Lake Storsjon) in Sweden. We investigate the links between a pollen-based land cover reconstruction from Lake Storsjon and paleoenvironmental variables from Gasfjarden itself, including diatom assemblages, organic carbon (C) and nitrogen (N) contents, stable C and N isotopic ratios, and biogenic silica contents. The Lake Storsjon record shows that regional land use was characterized by small-scale agricultural activity between 900 and 1400 CE, which slightly intensified between 1400 and 1800 CE. Substantial expansion of cropland was observed between 1800 and 1950 CE, before afforestation between 1950 and 2010 CE. From the Gasfjarden record, prior to 1800 CE, relatively minor changes in the diatom and geochemical proxies were found. The onset of cultural eutrophication in Gasfjarden can be traced to the 1800s and intensified land use is identified as the main driver. Anthropogenic activities in the 20th century have caused unprecedented ecosystem changes in the coastal inlet, as reflected in the diatom composition and geochemical proxies. (c) 2018 Elsevier Ltd. All rights reserved.
Subject: 1172 Environmental sciences
1171 Geosciences
LAND USE
EUTROPHICATION
MINING
HYPOXIA
COASTAL AREA
BALTIC SEA
NORTH-ATLANTIC OSCILLATION
LANDSCAPE RECONSTRUCTION ALGORITHM
LONG-TERM TRENDS
LAND-USE CHANGE
CYANOBACTERIA BLOOMS
RECENT EUTROPHICATION
EBRIA-TRIPARTITA
SOUTHERN SWEDEN
ORGANIC-MATTER
DANISH LAKES
Peer reviewed: Yes
Rights: cc_by_nc_nd
Usage restriction: openAccess
Self-archived version: acceptedVersion


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