Abstract
Instances of strong oxygen variations are described for two shallow water stations in the Kattegat, situated at the fluctuating frontal zone between outflowing surface water from the Baltic and inflowing bottom water from the Skagerrak/North Sea.
The events consist of both a rapid emergence and a rapid disappearance of oxygen-depletion. Changes in oxygen concentration amounted to more than 20 g m−2 d−1 for the total water columns. Such high rates of change can not be explained by net local bottom oxygen consumption (0.6 g m−2 d−1) or net local water oxygen consumption (1.6 g m−2 d−1). The oxygen variations were influenced by the local and regional meteorological conditions. The observed instance of shallow water oxygen-depletion was connected to upward movement of the pycnocline and associated advective transport of oxygen-depleted Kattegat bottom waters to a shallow water area. Similarly, rapid disappearance of the bottom water oxygen deficit in a shallow water area was found to depend more on pycnocline lowering in connection with advective transport, than on the effect of local wind driven mixing.
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Skyum, P., Christiansen, C., Lund-Hansen, L.C. et al. Advection-induced oxygen variability in the North Sea-Baltic Sea transition. Hydrobiologia 281, 65–77 (1994). https://doi.org/10.1007/BF00006436
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DOI: https://doi.org/10.1007/BF00006436