Journal Highlights

Calculating surface ocean pCO2 from biogeochemical Argo floats equipped with pH: an uncertainty analysis

Editor's Highlight—

This paper presents a dataset on carbon in the Southern Ocean. Surface partial pressure of carbon dioxide (pCO2) is calculated from measurements of pH on 74 biogeochemical profiling floats. Wintertime data in the Southern Ocean is notoriously sparse. These new data reveal significantly higher pCO2, and thus higher CO2 efflux, in some parts of the Southern Ocean. In addition to providing a rare snapshot into wintertime carbon dynamics in this historically under sampled region, this paper lays out methods that are likely to be widely used in future ocean carbon studies. 

Autonomous observing platform CO2 data shed new light on the Southern Ocean carbon cycle

Are Olsen


While the number of surface ocean CO2 partial pressure (pCO2) measurements has soared the recent decades, the Southern Ocean remains undersampled. Williams et al. (2017) now present pCO2 estimates based on data from pH-sensor equipped Bio-Argo floats, which have been measuring in the Southern Ocean since 2014. The authors demonstrate the utility of these data for understanding the carbon cycle in this region, which has a large influence on the distribution of CO2 between the ocean and atmosphere. Biogeochemical sensors deployed on autonomous platforms hold the potential to shape our view of the ocean carbon cycle in the coming decades. More…