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Baltic Sea Coastal Eutrophication in a Thousand Year Perspective
Södertörns högskola, Institutionen för naturvetenskap, miljö och teknik, Miljövetenskap. Södertörns högskola, Centrum för Östersjö- och Östeuropaforskning (CBEES), Baltic & East European Graduate School (BEEGS).
Södertörns högskola, Institutionen för naturvetenskap, miljö och teknik, Miljövetenskap.ORCID-id: 0000-0001-5615-6088
Leibniz Institute for Baltic Sea Research Warnemünde, Rostock, Germany.
University of Copenhagen, Copenhagen, Denmark.
Vise andre og tillknytning
2019 (engelsk)Inngår i: Frontiers in Environmental Science, ISSN 2296-665X, Vol. 7, artikkel-id 88Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Sediment cores from three sites along the east-coast of Sweden, north-western Baltic Proper, have been studied with respect to lithologies, geochemistry and diatom assemblages to trace and date early human impact with emphasis on nutrient discharge. The three sites Bråviken, Himmerfjärden and Ådfjärden, have been impacted to various degree during the last millennia by multiple stressors like excessive nutrient discharge and hazardous substances, leading to coastal hypoxia, eutrophication and pollution. These stressors are mainly caused by drivers in the drainage area as increased human population, changed land use and point sources as industries and a sewage treatment plant. Even though their detailed history differs, the results show similar general patterns for all three sites. We find no evidence in our data from the coastal zone supporting the hypothesis that the extensive areal distribution of hypoxia in the open Baltic Sea during the Medieval Climate Anomaly was caused by human impact. Timing of the onset of man-made eutrophication, as identified from d15N and changes in diatom composition, differs between the three sites, reflecting the site specific geography and local environmental histories of these areas. The onset of eutrophication dates to 1800 CE in Bråviken and Himmerfjärden areas, and to 1900 CE in the less urban area of Ådfjärden. We conclude that the recorded environmental changes during the last centuries are unique in a thousand year perspective.

sted, utgiver, år, opplag, sider
Frontiers Media S.A., 2019. Vol. 7, artikkel-id 88
Emneord [en]
diatom stratigraphy, stable nitrogen isotopes, hypoxia, Medieval Climate Anomaly, NW Baltic proper, nutrient discharge
HSV kategori
Forskningsprogram
Miljövetenskapliga studier; Östersjö- och Östeuropaforskning
Identifikatorer
URN: urn:nbn:se:sh:diva-38479DOI: 10.3389/fenvs.2019.00088Scopus ID: 2-s2.0-85068480167Lokal ID: 1562/3.1.1/2013OAI: oai:DiVA.org:sh-38479DiVA, id: diva2:1329961
Ingår i projekt
UPPBASER - Understanding Past and Present Baltic Sea Ecosystem Response - background for a sustainable future, The Foundation for Baltic and East European Studies
Forskningsfinansiär
The Foundation for Baltic and East European Studies, 1562/3.1.1/2013Stockholm County CouncilTilgjengelig fra: 2019-06-25 Laget: 2019-06-25 Sist oppdatert: 2019-08-06bibliografisk kontrollert

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