Origin and magnitude of interannual variabilities in Southern Ocean air-sea O2 and CO2 fluxes

Nicolas Mayot,Judith Hauck,Nicolas Gruber,Ralph Keeling,Tatiana Ilyina,Christian Rödenbeck,Corinne Le Quéré,Andrew Manning,Roland Séférian,Jörg Schwinger,Laure Resplandy,Laurent Bopp,David Willis

doi:10.5194/egusphere-egu22-12773

Abstract

&lt;p&gt;The Southern Ocean plays a major role in both the global oceanic uptake of anthropogenic CO&lt;sub&gt;2&lt;/sub&gt; and its interannual variations. The size and origin of the interannual variability in the Southern Ocean CO&lt;sub&gt;2&lt;/sub&gt; fluxes is debated. Observation-based estimates suggest a large variability (+/- 0.11 PgC/yr) while Global Ocean Biogeochemistry Models (GOBMs) simulate almost no variability. Studying the air-sea fluxes of O&lt;sub&gt;2&lt;/sub&gt; can provide independent information that help resolve this data-model inconsistency. Oceanic O&lt;sub&gt;2&lt;/sub&gt; is influenced by the same physical and biogeochemical processes as CO&lt;sub&gt;2&lt;/sub&gt;, but unlike CO&lt;sub&gt;2&lt;/sub&gt;, its variability is not masked by a large anthropogenic flux. Here, we used 26 years (1994-2019) of monthly O&lt;sub&gt;2&lt;/sub&gt; fluxes from 9 GOBMs. These model outputs were compared to air-sea O&lt;sub&gt;2&lt;/sub&gt; fluxes inferred from an atmospheric inversion of precisely quantified changes in atmospheric O&lt;sub&gt;2&lt;/sub&gt; and CO&lt;sub&gt;2&lt;/sub&gt; levels. The 26-year time series of air-sea O&lt;sub&gt;2&lt;/sub&gt; fluxes from all GOBMs and the atmospheric inversion exhibited similar temporal variations. This could be linked to the Southern Annular Mode and its influence on air-sea heat flux forcing that induced large-scale changes in observed wintertime Mixed Layer Depth (MLD). However, the amplitude of the interannual variability in air-sea O&lt;sub&gt;2&lt;/sub&gt; fluxes was two times higher in the atmospheric inversion than in GOBMs. It possible that this was induced by the general overestimation of the mean wintertime MLD by the GOBM and subsurface vertical gradients in oxygen saturation lower than observed. Implications of these results for the variability in air-sea fluxes of CO&lt;sub&gt;2&lt;/sub&gt; will be discussed.&lt;/p&gt;

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