p CO 2 variation in ice‐covered regions of the Arctic Ocean from the summer 2022 observation

• Published in: Limnology and Oceanography Letters
• Main Authors: Mo, Ahra, Park, Keyhong, Kim, Tae‐Wook, Hahm, Doshik, Choi, Jung‐Ok, Geum, Sohyeon, Jung, Jinyoung, Yang, Eun Jin
• Other Authors: Korea Institute of Marine Science and Technology promotion, Korea Polar Research Institute
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 2024
• Subjects: Arctic Ocean; Chukchi; Chukchi Sea; East Siberian Sea; Sea ice
• Online Access: http://dx.doi.org/10.1002/lol2.10415; https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lol2.10415

Abstract To enhance our understanding of the carbon cycle in the Arctic Ocean, comprehensive observational data are crucial, including measurements from the underlying ice water. This study proposed a practical method for calibrating p CO 2 sensor using measured dissolved inorganic carbon and total alkalinity. Our findings suggested the minimum number of bottle samples needed for calibration to ensure 1% accuracy. Additionally, we identified the significant role of a decrease in dissolved inorganic carbon due to photosynthesis and the increase in buffer capacity of the seawater from the release of excess alkalinity by sea ice in regulating p CO 2 . The mean air–sea CO 2 fluxes were −48.9 ± 44.6, −7.3 ± 14.6, and −1.4 ± 2.8 mmol m −2 d −1 in the southern Chukchi Sea, northern Chukchi Sea, and northern East Siberian Sea, respectively. We found a robust negative correlation between the flux and sea ice concentration in the Arctic Sea ice regions.