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• W2085497384 abstract "The Subantarctic Zone (SAZ), which covers the northern half of the Southern Ocean between the Subtropical and Subantarctic Fronts, is important for air‐sea CO 2 exchange, ventilation of the lower thermocline, and nutrient supply for global ocean productivity. Here we present the first high‐resolution autonomous observations of mixed layer CO 2 partial pressure ( p CO 2 ) and hydrographic properties covering a full annual cycle in the SAZ. The amplitude of the seasonal cycle in p CO 2 (∼60 μatm), from near‐atmospheric equilibrium in late winter to ∼330 μatm in midsummer, results from opposing physical and biological drivers. Decomposing these contributions demonstrates that the biological control on p CO 2 (up to 100 μatm), is 4 times larger than the thermal component and driven by annual net community production of 2.45 ± 1.47 mol C m −2 yr −1 . After the summer biological p CO 2 depletion, the return to near‐atmospheric equilibrium proceeds slowly, driven in part by autumn entrainment into a deepening mixed layer and achieving full equilibration in late winter and early spring as respiration and advection complete the annual cycle. The shutdown of winter convection and associated mixed layer shoaling proceeds intermittently, appearing to frustrate the initiation of production. Horizontal processes, identified from salinity anomalies, are associated with biological p CO 2 signatures but with differing impacts in winter (when they reflect far‐field variations in dissolved inorganic carbon and/or biomass) and summer (when they suggest promotion of local production by the relief of silicic acid or iron limitation). These results provide clarity on SAZ seasonal carbon cycling and demonstrate that the magnitude of the seasonal p CO 2 cycle is twice as large as that in the subarctic high‐nutrient, low‐chlorophyll waters, which can inform the selection of optimal global models in this region." @default.
• W2085497384 created "2016-06-24" @default.
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• W2085497384 date "2015-02-01" @default.
• W2085497384 modified "2023-10-17" @default.
• W2085497384 title "Seasonality of biological and physical controls on surface ocean CO₂from hourly observations at the Southern Ocean Time Series site south of Australia" @default.
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• W2085497384 doi "https://doi.org/10.1002/2014gb004906" @default.
• W2085497384 hasPublicationYear "2015" @default.
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