Observed carbon dioxide and oxygen dynamics in a Baltic Sea coastal region
2011
Wesslander, Karin | Hall, Per | Hjalmarsson, Sofia | Lefèvre, Dominique | Omstedt, Anders | Rutgersson, Anna | Sahlée, Erik | Tengberg, Anders
In April 2006, diurnal variations of carbon dioxide (CO₂) and oxygen (O₂) in the surface water east of Gotland in the Baltic Sea were investigated with a unique multitechnology approach. Several parameters were measured simultaneously providing an overview of the CO₂ system. Moored instruments were continuously recording partial pressure of CO₂ in the surface water (pCO₂ ʷ), currents, mixing, waves, salinity, temperature and O₂. Measurements of total alkalinity (AT) and dissolved inorganic carbon (CT) were taken from R/V Skagerak. These measurements were converted to pCO₂ ʷ to support the continuous pCO₂ ʷ data and also calculate the air–sea exchange of CO₂. Additionally, the time derivatives of O₂ and CT concentrations in the water were determined using incubations and a Productivity Autosampler (PA). O₂ and pCO₂ ʷ were significantly anti-correlated and periods dominated of either biological processes, mixing, air–sea exchange or a combination of these were detected. O₂ and pCO₂ ʷ had a daily cycle and variations occurred on the 1h time scale. In April 2006, the sea was a CO₂ sink and the averaged parameterized air–sea exchange was −1.0±0.6mmolm⁻²h⁻¹.
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