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 CO fluxes in areas of high mesoscale eddy activity (e.g., Southern Ocean and western boundary currents). In these regions and at scales larger than 500 km (~5°), CIV contributes significantly to the interannual variability of sea-air CO fluxes. Between 35°S and 45°S (midlatitude Southern Ocean), CIV amounts to 23.76 TgC yr or one half of the atmospherically forced variability. Locally, its contribution to the total interannual variance of sea-air CO fluxes exceeds 76%. Outside eddy-active regions its contribution to total interannual variability is below 16%.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7757255 | PMC |
| http://dx.doi.org/10.1029/2020GL088304 | DOI Listing |
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