Zadow, Frederike (2020) Die kleinskalige Variabilität von Lachgas in der Eckernförder Bucht (westlich Ostsee). (Bachelor thesis), Christian-Albrechts-Universität zu Kiel, Kiel, Germany, 42 pp.

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Abstract

The aim of this work was to validate the extent to which nitrous oxide measurements from the Boknis Eck station represent the entire western Baltic Sea. Based on different seawater samples taken in 2018, the area of the Eckernförder Bucht was investigated for small-scale temporal and spatial variability in nitrous oxide concentrations in June and September. This was done using the "Static Headspace Equilibrium" method. In addition to the variability of nitrous oxide concentrations, small-scale variability in saturation and flux density of nitrous oxide were also considered. The obtained results showed that no strong temporal and spatial variabilities occure in the mixed layer. However, there is spatial variability in deeper water layers, which has a stronger impact in September than in June. In September, based on the spatial variability, the gradient of nitrous oxide concentration over the water column is reversed depending on the position of the measurment. On the basis of surface measurements it was further determined that no strong gradient of nitrous oxide concentration occurs in the upper 1.5 m of the water column. This showed that the flux density calculated using the nitrous oxide concentration in 1.5 m depth did not differ significantly from the flux density calculated using the nitrous oxide concentration in 0.1 m depth. Thus, nitrous oxide data from the Boknis Eck monitoring station in June and September are representative for the western Baltic Sea within the mixed layer. Below the mixed layer, it is shown tha during September a higher spatial resolution would be necessary to cover all areas of the western Baltic Sea sufficiently. In June, however, sampling of Boknis Eck below the mixed-layers is sufficient to draw conclusions fort the western Baltic Sea.

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