We are excited to announce the release of Surface Ocean CO₂ Atlas (SOCAT) version 2022 which is now available via www.socat.info. The ocean absorbs a quarter of the global CO₂ (carbon dioxide) emissions from human activity. The community-led Surface Ocean CO₂ Atlas (www.socat.info) is key for the quantification of ocean CO₂ uptake and its variation, now and in the future. 

SOCAT version 2022 has quality-controlled in situ surface ocean fCO₂ (fugacity of CO₂) measurements made on ships, moorings, autonomous and drifting surface platforms for the global ocean and coastal seas from 1957 to 2021. The main SOCAT synthesis and gridded products contain 33.7 million fCO₂ values with an estimated accuracy of < 5 μatm. A further 6.4 million fCO₂ sensor data with an accuracy of 5 to 10 μatm are separately available. SOCAT is used for quantification of ocean CO₂ uptake and ocean acidification and for evaluation of climate models and sensor data. The SOCAT synthesis products are a crucial step in the value chain based on in situ inorganic carbon measurements of the ocean, which provides policy makers with vital information in climate negotiations. The need for accurate knowledge of global ocean CO₂ uptake and its variation makes sustained funding of in situ surface ocean CO₂ observations and their synthesis imperative. 

Please see the SOCATv2022 release poster for more information. Thank you to everyone who has contributed to the timely, annual release of SOCATv2022!