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The variability of the Southern Ocean’s circulation and carbon cycle: New insights from autonomous observations

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If you have a question about this talk, please contact Dr Yohei Takano.

The Southern Ocean plays a fundamental role in the global climate system, dominating the oceanic uptake of heat and anthropogenic carbon, primarily due to its unique large-scale circulation. However, the remote and extreme conditions found there make the Southern Ocean perpetually one of the most difficult places on the planet to observe and to model, resulting in significant and persistent uncertainties in our knowledge of both the dynamics and the carbon cycle. Advances in using autonomous profiling floats to observe the open Southern Ocean, as well as the marginal sea ice zone, now enable the collection of subsurface physical and biogeochemical measurements with unprecedented data coverage in space and time. This seminar will present some new insights resulting from the analysis of these observations together with data from satellites and numerical models. The physical circulation is investigated using estimates of the horizontal flows in the upper portion of the Southern Ocean as well as mesoscale vertical velocities near 1000 m, with an emphasis on the impact of standing meanders of the Antarctic Circumpolar Current. The influence of these standing meanders on biogeochemical cycling in the region is then examined and compared to the representation in several different numerical simulations.  I conclude by discussing implications of these findings for how we observe, model and ultimately understand the circulation and carbon cycle of the Southern Ocean.  

This talk is part of the British Antarctic Survey - Polar Oceans seminar series series.

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