Articles | Volume 17, issue 6
Research article
18 Nov 2021
Research article |  | 18 Nov 2021

The diurnal cycle of pCO2 in the coastal region of the Baltic Sea

Martti Honkanen, Jens Daniel Müller, Jukka Seppälä, Gregor Rehder, Sami Kielosto, Pasi Ylöstalo, Timo Mäkelä, Juha Hatakka, and Lauri Laakso

Related authors

Interannual and seasonal variability of the air-sea CO2 exchange at Utö in the coastal region of the Baltic Sea
Martti Honkanen, Mika Aurela, Juha Hatakka, Lumi Haraguchi, Sami Kielosto, Timo Mäkelä, Jukka Seppälä, Simo-Matti Siiriä, Ken Stenbäck, Juha-Pekka Tuovinen, Pasi Ylöstalo, and Lauri Laakso
EGUsphere,,, 2024
Short summary
Measuring turbulent CO2 fluxes with a closed-path gas analyzer in a marine environment
Martti Honkanen, Juha-Pekka Tuovinen, Tuomas Laurila, Timo Mäkelä, Juha Hatakka, Sami Kielosto, and Lauri Laakso
Atmos. Meas. Tech., 11, 5335–5350,,, 2018
Short summary

Cited articles

Algesten, G., Brydsten, L., Jonsson, P., Kortelainen, P., Löfgren, S., Rahm, L., Räike, A., Sobek, S., Tranvik, L., Wikner, J., and Jansson, M.: Organic carbon budget for the Gulf of Bothnia, J. Mar. Syst., 63, 155–161,, 2006. a
Andersson, A., Tamminen, T., Lehtinen, S., Jürgens, K., Labrenz, M., and Viitasalo, M.: The pelagic food web, in: Biological Oceanography of the Baltic Sea, edited by: Snoeijs-Leijonmal, P., Schubert, H., and Radziejewska T., Springer, Dordrecht,, 2017. a
Andersson, A. J. and Mackenzie, F. T.: Revisiting four scientific debates in ocean acidification research, Biogeosciences, 9, 893–905,, 2012. a
Benson, B. B. and Krause, D.: The concentration and isotopic fractionation of gases dissolved in freshwater in equilibrium with the atmosphere: 1. Oxygen, Limnol. Oceanogr., 25, 662–671,, 1980. a
Dickson, A. G., Sabine, C. L. and Christian, J. R.: Guide to best practices for ocean CO2 measurements, Special Publication 3, IOCCP Report 8, North Pacific Marine Science Organization (PICES), Sidney, British Columbia, Canada,, 2007. a, b
Short summary
The exchange of carbon dioxide (CO2) between the sea and the atmosphere is regulated by the gradient of CO2 partial pressure (pCO2) between the sea and the air. The daily variation of the seawater pCO2 recorded at the fixed station Utö in the Baltic Sea was found to be mainly biologically driven. Calculation of the annual net exchange of CO2 between the sea and atmosphere based on daily measurements of pCO2 carried out using the same sampling time every day could introduce a bias of up to 12 %.