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  • Moros, MatthiasLeibniz Inst Balt Sea Res Warnemunde, Seestr 15, D-18119 Rostock, Germany. (författare)

Towards an event stratigraphy for Baltic Sea sediments deposited since AD 1900 : approaches and challenges

  • Artikel/kapitelEngelska2017

Förlag, utgivningsår, omfång ...

  • 2016-10-24
  • Wiley,2017
  • printrdacarrier

Nummerbeteckningar

  • LIBRIS-ID:oai:DiVA.org:uu-316418
  • https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-316418URI
  • https://doi.org/10.1111/bor.12193DOI

Kompletterande språkuppgifter

  • Språk:engelska
  • Sammanfattning på:engelska

Ingår i deldatabas

Klassifikation

  • Ämneskategori:ref swepub-contenttype
  • Ämneskategori:art swepub-publicationtype

Anmärkningar

  • Reconstructions of environmental changes at sub-decadal to decadal resolution based on central Baltic Sea sediments rely on accurate and precise high-resolution sediment depth/age relationships. A model chronology for Baltic Sea sediments is presented here based on established historical records of anthropogenic radionuclides (Cs-137/Am-241/bomb(14)C), polychlorinated biphenyls (PCBs), lead (Pb) and stable lead isotope (Pb-206/207 ratios), and radionuclide Pb-210 and C-14 decay dating methods. Marker horizons consisting of chemical precipitates formed by documented Major Baltic Inflow (MBIs) events and an extended diatom bloom period were also integrated into the model. The main time markers in Baltic Sea sediments that formed during the last 120years were the following: (i) the deepest observation of Pb-210(unsupp.) (marking the Pb-210 dating horizon) and departure of Hg from natural background levels at c.AD 1900; (ii) first detectable presence of PCBs at AD 1935; (iii) radionuclide production (i.e. Am-241) due to nuclear weapons testing between AD 1954 and AD 1975, with a peak in AD 1963; (iv) maximum heavy metal and PCB concentrations in the AD 1960s/1970s; (v) the Chernobyl nuclear accident in AD 1986 as a sharp Cs-137 increase; (vi) exceptionally strong diatom blooms with a massive diatom layer found in the Eastern Gotland Basin in AD 1988-1990; and (vii) characteristic manganese-carbonate layers in the deeper central basins formed by MBIs in AD 1993 and AD 2003. A precise and accurate sediment depth/age relationship can only be achieved in restricted areas of the Baltic Sea where continuous sedimentation has prevailed and there has been limited postdepositional disturbance. We demonstrate that parallel Hg and Cs-137 measurements can be used to assess the quality of sediment sequences for high-resolution environmental reconstructions. We show examples of sediment profiles that conform to the historical record, and examples from Western Baltic Sea areas where it appears to be impossible to establish accurate geochronologies.

Ämnesord och genrebeteckningar

Biuppslag (personer, institutioner, konferenser, titlar ...)

  • Andersen, Thorbjorn J.Univ Copenhagen, Dept Geosci & Nat Resource Management, Oster Voldgade 10, DK-1350 Copenhagen, Denmark. (författare)
  • Schulz-Bull, DetlefLeibniz Inst Balt Sea Res Warnemunde, Seestr 15, D-18119 Rostock, Germany. (författare)
  • Haeusler, KatharinaLeibniz Inst Balt Sea Res Warnemunde, Seestr 15, D-18119 Rostock, Germany. (författare)
  • Bunke, DennisLeibniz Inst Balt Sea Res Warnemunde, Seestr 15, D-18119 Rostock, Germany. (författare)
  • Snowball, IanUppsala universitet,Geofysik(Swepub:uu)iansn468 (författare)
  • Kotilainen, AarnoGeol Survey Finland, PL 96,Betonimiehenkuja 4, Espoo 02151, Finland. (författare)
  • Zillen, LovisaGeol Survey Sweden, Dept Marine Geol, Box 670, S-75128 Uppsala, Sweden. (författare)
  • Jensen, Jorn B.Geol Survey Denmark & Greenland, Oster Voldgade 10, DK-1350 Copenhagen, Denmark. (författare)
  • Kabel, KarolineLeibniz Inst Balt Sea Res Warnemunde, Seestr 15, D-18119 Rostock, Germany. (författare)
  • Hand, InesLeibniz Inst Balt Sea Res Warnemunde, Seestr 15, D-18119 Rostock, Germany. (författare)
  • Leipe, ThomasLeibniz Inst Balt Sea Res Warnemunde, Seestr 15, D-18119 Rostock, Germany. (författare)
  • Lougheed, Bryan C.Uppsala Univ, Dept Earth Sci, Villavagen 16, S-75236 Uppsala, Sweden.;Vrije Univ Amsterdam, Dept Earth Sci, De Boelelaan 1085, NL-1081 HV Amsterdam, Netherlands. (författare)
  • Wagner, BerndUniv Cologne, Zulpicher Str 49a, D-50674 Cologne, Germany. (författare)
  • Arz, Helge W.Leibniz Inst Balt Sea Res Warnemunde, Seestr 15, D-18119 Rostock, Germany. (författare)
  • Leibniz Inst Balt Sea Res Warnemunde, Seestr 15, D-18119 Rostock, Germany.Univ Copenhagen, Dept Geosci & Nat Resource Management, Oster Voldgade 10, DK-1350 Copenhagen, Denmark. (creator_code:org_t)

Sammanhörande titlar

  • Ingår i:Boreas: Wiley46:1, s. 129-1420300-94831502-3885

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