The purpose of this project is to measure and calculate pCO2 and pH in high Arctic coastal sea ice. The measured pCO2 and pH values can be compared to the calculated values ​​based on measurements of salt, temperature, TCO2 and TA ratios in the sea ice, which will be measured concurrently. Since algorithms for pCO2 calculations have not yet been developed for sea ice, this will contribute with useful knowledge.