Dissolved Organic Carbon in the Arctic Ocean and Organic Alkalinity in Sea Ice Brine from ARTofMELT 2023

While total alkalinity is traditionally attributed to dissolved inorganic constituents, dissolved organic matter (DOM) can significantly contribute to total alkalinity, introducing errors in carbonate parameter calculations such as calcium carbonate (CaCO3) saturation state (Ω) and partial pressure of carbon dioxide (CO2) (pCO2). Accurately quantifying organic alkalinity (OrgAlk) is particularly crucial in the rapidly changing Arctic. The data presented here is aimed at discerning the presence of OrgAlk in the Arctic Ocean and assesses its influence on carbonate speciation.
This data was collected 7 May - 15 June on the ARTofMELT expedition aboard I/B Oden vessel in the eastern Central Arctic Ocean, primarily in the Fram Strait region. The overall expedition was focused on atmospheric rivers and meteorology, but this data set is from the chemical oceanography group aimed at understanding the inorganic carbon system within sea ice and the underlying water throughout the onset of a melt season. This data includes the dissolved organic carbon concentrations, organic alkalinity contribution (both directly measured via back-titrations and calculated via CO2SYS with pH and dissolved inorganic carbon data), and calculated carbonate parameters (pCO2, pH, and CaCO3 saturation states) depending on the inclusion or omission of the organic alkalinity component