Measuring pH in the Arctic Ocean: Colorimetric method or SeaFET?

Victoire Rérolle (1) , Diana Ruiz-Pino (2) , Mehrad Rafizadeh (1) , Socratis Loucaides (3) , Stathys Papadimitriou (4) , Matthew Mowlem (3) , Jianfang Chen (5)

1 ABC - Austral, Boréal et Carbone
2 E-CO2 - Équipe CO2
3 NOC - National Oceanography Centre [Southampton]
4 Bangor University
5 Second Institute of Oceanography

The suitability of the colorimetric method in a custom-made instrumental set-up and the commercial potentiometric SeaFET®electrode sensor to measure pH in surface oceanic water in the Arctic was investigated during the Chinese Arctic Research Expedition (CHINARE) in summer 2014. The instruments were set up in parallel on the on-board underway seawater supply for 65 days, enabling comparison in various conditions in the Arctic Ocean from the Chukchi Sea to the ice-covered high latitudes (81°N) and the open-water North-western Pacific Ocean. Overall, the instruments yielded pH datasets of similar high quality (method uncertainty ≤0.010

Mots clés: PH; Arctic Ocean; Sensors; Colorimetric; SeaFET; Acidification

Domaines: Océanographie

Victoire Rérolle, Diana Ruiz-Pino, Mehrad Rafizadeh, Socratis Loucaides, Stathys Papadimitriou, et al.. Measuring pH in the Arctic Ocean: Colorimetric method or SeaFET?. Methods in Oceanography, 2016, 17, pp.32-49. ⟨10.1016/j.mio.2016.05.006⟩. ⟨hal-01346480⟩