资源环境科技发展态势分析平台

Chaotic Intrinsic Variability (CIV) emerges spontaneously from nonlinear ocean dynamics even without any atmospheric variability. Eddy‐permitting numerical simulations suggest that CIV is a significant contributor to the interannual to decadal variability of physical properties. Here we show from an ensemble of global ocean eddy‐permitting simulations that large‐scale interannual CIV propagates from physical properties to sea‐air CO₂ fluxes in areas of high mesoscale eddy activity (e.g. Southern Ocean, Western Boundary currents). In these regions and at scales larger than 500 km (~5°), CIV contributes significantly to the interannual variability of sea‐air CO₂ fluxes. Between 35°S and 45°S (mid‐latitude Southern Ocean), CIV amounts to 23.76 TgC y^‐1 or one half of the atmospherically‐forced variability. Locally its contribution to the total interannual variance of sea‐air CO₂ fluxes exceeds 76%. Outside eddy‐active regions its contribution to total interannual variability is below 16%.