Two scientist taking samples from RV Alkor  in the Baltic Sea

Image of the month: August 2020

Understanding the Baltic Sea through Time Series

Our image of the month shows work on the research vessel Alkor in the Bornholm Basin in the central Baltic Sea. Departing from Kiel scientist have been carrying out measurements in the open Baltic Sea since 1986. These long-term measurement series are therefore one of the best available integrative data series in the pelagic system‘—the free water system— of the marginal sea. For the data series, the researchers use very different measurement techniques, such as hydrographical methods, plankton/necton sampling, hydroacoustics and pelagic trawl fisheries including intensive fish sampling. The GEOMAR scientists are working together with scientists from the University of Southern Denmark, for example:  On the left Silvia Kollerova from the University of Denmark is filtering plankton samples for further processing in the wet lab on board. Meanwhile, Felix Mittermayer from GEOMAR is preparing a CTD probe for use. It helps to create water profiles by determining oxygen content, temperature and salinity. The good weather that accompanied the entire 16-day journey was unusual.


If you would like to look back on the Baltic Sea cruise, you can do so at . Here, scientists or students report on the voyages, the sampling and the time at sea.

Two scientist taking samples from RV Alkor  in the Baltic Sea
  • GEOMAR Helmholtz Centre for Ocean Research Kiel
    Wischhofstr. 1-3
    24148 Kiel
    Phone: +49 431 600-2809
    Fax: +49 431 600-132809
    e-mail: presse(at)