Surface carbonate chemistry in the Yellow Sea was investigated based on discrete seawater samples collected from 2017 to 2020 at the Socheongcho Ocean Research Station (S-ORS; 37.423°N, 124.738°E). Records of carbon parameters, including seawater CO partial pressure (pCO), revealed considerable seasonal variations, with amplitudes comparable to those observed across the western part of the Yellow Sea. The study site acted as a modest sink (-0.13 mol C m yr) for atmospheric CO. Biological processes (primary production and respiration) and physical conditions (temperature and degree of stratification) determined seawater pCO, which fluctuated on an intraseasonal timescale between oversaturated and undersaturated with respect to atmospheric pCO. Variation in pCO was significant in summer, depending on the biological carbon drawdown and tidal mixing-induced upwelling (increased pCO up to ~1000 μatm). The intraseasonal variability in seawater pCO may bias estimated air-sea CO fluxes, if measurements with a coarser (seasonal) time resolution are used.
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http://dx.doi.org/10.1016/j.marpolbul.2022.113822 | DOI Listing |
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