Improved atmospheric constraints on Southern Ocean CO₂ exchange.

ABSTRACT: We present improved estimates of air-sea CO₂ exchange over three latitude bands of the Southern Ocean using atmospheric CO₂ measurements from global airborne campaigns and an atmospheric 4-box inverse model based on a mass-indexed isentropic coordinate (M_θe). These flux estimates show two features not clearly resolved in previous estimates based on inverting surface CO₂ measurements: a weak winter-time outgassing in the polar region and a sharp phase transition of the seasonal flux cycles between polar/subpolar and subtropical regions. The estimates suggest much stronger summer-time uptake in the polar/subpolar regions than estimates derived through neural-network interpolation of pCO₂ data obtained with profiling floats but somewhat w

SUBMITTER: Jin Y 

PROVIDER: S-EPMC10861854 | biostudies-literature | 2024 Feb

REPOSITORIES: biostudies-literature