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@uaf-oarc-alaska.bsky.social Sep 16, 2026, 7:41 PM

Our Gulf of Alaska #OceanAcidification buoy site has mostly observed below average sea surface temperatures in 2026 when compared to our full record. 🧪🌊🦑🛟 #GAKOA

Project
Mooring site GAKOA in the northern Gulf of Alaska is led by University of Alaska Fairbanks Ocean Acidification Research Center (UAF OARC) to observe seawater carbon dioxide to detect ocean acidification. All surface observations at GAKOA show a strong seasonal signal.

Figures
The top panel shows observations of the difference in the partial pressure of carbon dioxide (ΔpCO₂) between one meter above the sea-air interface and one meter below the sea-air interface. A negative value indicates the seawater pCO₂ is lower than air, and the site is a carbon dioxide sink to the atmosphere. Seawater carbon dioxide is consumed by phytoplankton during the summer, resulting in more negative ΔpCO₂ values.

The middle panel is surface seawater temperature (SST), observed by a seaCAT sensor moored one meter below the sea-air interface.

The bottom panel is surface seawater salinity (SSS), observed by a seaCAT sensor moored one meter below the sea-air interface.

The dark black line is the site average, the gray lines are the final and archived data from previous deployments (i.e., 2011-2025), and the blue dots are the 3-hour, raw data from the current deployment.

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