Articles | Volume 17, issue 6
https://doi.org/10.5194/os-17-1657-2021
https://doi.org/10.5194/os-17-1657-2021
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

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Latest update: 24 Feb 2024
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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 %.