July 9, 2018: FB1 seminar

11:00, Lecture Hall, Düsternbrooker Weg 20

The strong vertical stratification of the Baltic Sea is efficiently prohibitng the vertical transport of oxygen from the surface into the deeper water body, which is causing anoxic conditions within this water mass. The anoxic conditions are interrupted by intermittently occuring Major Baltic Inflows (MBI), which are able to ventilate the deeper parts of the Baltic Sea. A recent MBI in 2014 was intensively studied using state of the art turbulence measurements mounted on a long term profiling mooring. The dataset shows novel measurements of mixing during the time the gravity current enters the central Baltic Sea. Despite from MBIs, intermediate water depths are regularly ventilated by small scale intrusions. Recent results suggest that these intrusions, compared to MBI, do transport in total more than five times the amount of oxygen into the suboxic and anoxic water masses of the Baltic. Both examples show that the lateral transport is a key process for the transport of oxygen into the deep water of the Baltic Sea. The role and implications of these transport processes are discussed.

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