03 Jul 2023
 | 03 Jul 2023
Status: this preprint is currently under review for the journal SP.

Seawater carbonate system considerations for ocean alkalinity enhancement research

Kai G. Schulz, Lennart T. Bach, and Andrew G. Dickson

Abstract. Ocean alkalinity enhancement (OAE) is a proposed marine carbon dioxide removal (mCDR) approach that has the potential for large-scale uptake of significant amounts of atmospheric carbon dioxide (CO2). Removing anthropogenic legacy CO2 will be required to stabalise global surface temperatures below the 1.5–2 °C Paris Agreement target of 2015. In this chapter we describe the impacts of various OAE feedstocks on seawater carbonate chemistry, as well as pitfalls that need to be avoided during sampling, storage and measurement of the four main carbonate chemistry parameters, i.e. dissolved inorganic carbon (DIC), total alkalinity (TA), pH and CO2 fugacity (fCO2). Finally, we also discuss considerations in regard to calculating carbonate chemistry speciation from two measured parameters.

Kai G. Schulz et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on sp-2023-12', Anonymous Referee #1, 07 Jul 2023
    • AC1: 'Reply on RC1', Kai G. Schulz, 18 Aug 2023
  • RC2: 'Comment on sp-2023-12', Anonymous Referee #2, 28 Aug 2023
    • AC2: 'Reply on RC2', Kai G. Schulz, 22 Sep 2023
  • AC3: 'Final Response', Kai G. Schulz, 29 Sep 2023

Kai G. Schulz et al.

Kai G. Schulz et al.


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Short summary
Ocean alkalinity enhancement if a promising approach for long-term anthropogenic carbon dioxide sequestration, required to avoid catastrophic climate change. In this chapter we describe its impacts on seawater carbonate chemistry speciation and highlight pitfalls that need to be avoided during sampling, storage, measurement and calculations.