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Hg-Cyano II: Die Bedeutung von Cyanobakterien für die Quecksilberemission der Ostsee - Folgeantrag

Duration:
01.04.2013 - 31.03.2014
Project manager:
Dr. Joachim Kuss
Funding:
DFG - Deutsche Forschungsgemeinschaft
Researchfocus:
Associated Institution:
none

The Baltic Sea shows a maximum of elemental mercury (Hg0) release in mid-summer. It is investigated, if the transformation of ionic mercury to volatile Hg0 is actively done by cyanobacteria or if it is the result of photochemical reaction. The study comprises in situ measurements, culture experiments and microbiological analyses.

The emission of elemental mercury from the surface of the Baltic Sea shows a distinct seasonality. The maximum was in mid-summer at intense solar radiation and widespread cyanobacteria blooms. During a research campaign on the new research vessel of IOW in summer 2011 it is investigated, if the transformation of ionic mercury to volatile elemental mercury is biogenic and mainly caused by cyanobacteria or by abiotic photochemical reaction. This is studied by in situ measurements and accompanying incubation experiments. During incubation certain control mechanisms (light, biology) are distinctly excluded. Which cyanobacteria genera actively transform mercury is shown by microbiological analyses.

Publikationen

  • Kuss, J., S. Krüger, J. Ruickoldt and K.-P. Wlost (2018). High-resolution measurements of elemental mercury in surface water for an improved quantitative understanding of the Baltic Sea as a source of atmospheric mercury. Atmos. Chem. Phys. 18: 4361-4376, doi: 10.5194/acp-18-4361-2018
  • Kuss, J., S. Krüger, J. Ruickoldt and K.-P. Wlost (2018). High-resolution measurements of elemental mercury in surface water for an improved quantitative understanding of the Baltic Sea as a source of atmospheric mercury. Atmos. Chem. Phys. 18: 4361-4376, doi: 10.5194/acp-18-4361-2018