Articles | Volume 19, issue 6
https://doi.org/10.5194/bg-19-1657-2022
https://doi.org/10.5194/bg-19-1657-2022
Research article
 | 
23 Mar 2022
Research article |  | 23 Mar 2022

Tidal mixing of estuarine and coastal waters in the western English Channel is a control on spatial and temporal variability in seawater CO2

Richard P. Sims, Michael Bedington, Ute Schuster, Andrew J. Watson, Vassilis Kitidis, Ricardo Torres, Helen S. Findlay, James R. Fishwick, Ian Brown, and Thomas G. Bell

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Cited articles

Abril, G., Bouillon, S., Darchambeau, F., Teodoru, C. R., Marwick, T. R., Tamooh, F., Ochieng Omengo, F., Geeraert, N., Deirmendjian, L., Polsenaere, P., and Borges, A. V.: Technical Note: Large overestimation of pCO2 calculated from pH and alkalinity in acidic, organic-rich freshwaters, Biogeosciences, 12, 67–78, https://doi.org/10.5194/bg-12-67-2015, 2015. 
Ahmed, M. and Else, B. G.: The Ocean CO2 Sink in the Canadian Arctic Archipelago: A Present-Day Budget and Past Trends Due to Climate Change, Geophys. Res. Lett., 46, 9777–9785, 2019. 
Bakker, D. C., de Baar, H. J., and de Wilde, H. P.: Dissolved carbon dioxide in Dutch coastal waters, Mar. Chem., 55, 247–263, 1996. 
Bauer, J. E., Cai, W.-J., Raymond, P. A., Bianchi, T. S., Hopkinson, C. S., and Regnier, P. A.: The changing carbon cycle of the coastal ocean, Nature, 504, 61–70, https://doi.org/10.1038/nature12857, 2013. 
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Short summary
The amount of carbon dioxide (CO2) being absorbed by the ocean is relevant to the earth's climate. CO2 values in the coastal ocean and estuaries are not well known because of the instrumentation used. We used a new approach to measure CO2 across the coastal and estuarine zone. We found that CO2 and salinity were linked to the state of the tide. We used our CO2 measurements and model salinity to predict CO2. Previous studies overestimate how much CO2 the coastal ocean draws down at our site.
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