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Daniel Conley

Daniel Conley

Professor

Daniel Conley

Recovery from multi-millennial natural coastal hypoxia in the Stockholm Archipelago, Baltic Sea, terminated by modern human activity

Författare

  • Niels A.G.M. van Helmond
  • Bryan C. Lougheed
  • Annika Vollebregt
  • Francien Peterse
  • Guillaume Fontorbe
  • Daniel J. Conley
  • Caroline P. Slomp

Summary, in English

Enhanced nutrient input and warming have led to the development of low oxygen (hypoxia) in coastal waters globally. For many coastal areas, insight into redox conditions prior to human impact is lacking. Here, we reconstructed bottom water redox conditions and sea surface temperatures (SSTs) for the coastal Stockholm Archipelago over the past 3000 yr. Elevated sedimentary concentrations of molybdenum indicate (seasonal) hypoxia between 1000 b.c.e. and 1500 c.e. Biomarker-based (TEX86) SST reconstructions indicate that the recovery from hypoxia after 1500 c.e. coincided with a period of significant cooling (∼ 2°C), while human activity in the study area, deduced from trends in sedimentary lead and existing paleobotanical and archeological records, had significantly increased. A strong increase in sedimentary lead and zinc, related to more intense human activity in the 18th and 19th century, and the onset of modern warming precede the return of hypoxia in the Stockholm Archipelago. We conclude that climatic cooling played an important role in the recovery from natural hypoxia after 1500 c.e., but that eutrophication and warming, related to modern human activity, led to the return of hypoxia in the 20th century. Our findings imply that ongoing global warming may exacerbate hypoxia in the coastal zone of the Baltic Sea.

Avdelning/ar

  • Geologiska institutionen
  • Kvartärgeologi
  • BECC: Biodiversity and Ecosystem services in a Changing Climate

Publiceringsår

2020

Språk

Engelska

Sidor

3085-3097

Publikation/Tidskrift/Serie

Limnology and Oceanography

Volym

65

Issue

12

Dokumenttyp

Artikel i tidskrift

Förlag

ASLO

Ämne

  • Geology

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1939-5590