These data are part of the measurements conducted at the time series station Boknis Eck located in the southwestern Baltic Sea at 54°31.77'N, 10°02.36'E. The data include dissolved organic carbon (DOC), total dissolved nitrogen (TDN), dissolved organic nitrogen (DON), bacterial biomes production and bacterial cell counts. Samples were taken once a month at 6 standard depths (1, 5, 10, 15, 20 and 25 m). The data was acquired onboard FK Littorina using a rosette sampler. DOC/TDN were measured using a TOC analyzer, bacterial biomass production data was acquired by leucine incorporation (70 min incubation and counted using a liquid scintillation counter), and bacterial cell abundance was determined using flow cytometry.
We simulated an experimental summer storm in large-volume (~1200 m³, ~16m depth) enclosures in Lake Stechlin (https://www.lake-lab.de) by mixing deeper water masses from the meta- and hypolimnion into the mixed layer (epilimnion). The mixing included the disturbance of a deep chlorophyll maximum (DCM) which was present at the same time of the experiment in Lake Stechlin and situated in the metalimnion of each enclosure during filling. Size-fractionated Bacterial Protein Production (BPP) of particle associated (PA, >3.0 µm) and free-living bacteria (FL, 0.2-3.0 µm) (14C-Leu incorporation) as well as abundances of PA (microscopy of DAPI stained cells on 3.0 µm polycarbonate filters) and FL heterotrophic prokaryotes and picocyanobacteria (flow cytometry of SYBR green I stained cells) were monitored for 42 days after the experimental disturbance event. Mixing increased bacterial abundance and production about 3 weeks after mixing, which was associated to a mixing-induced stimulation of phytoplankton growth in the mixed enclosures compared to the controls. Simultaneously, decreased abundances of picocyanobacteria could be observed in mixed enclosures.