Abstract
The Antarctic Circumpolar Current (ACC) variability is studied using the Argo-Based Model for Investigation of the Global Ocean (AMIGO) recently developed at the Shirshov Institute of Oceanology. A prominent feature of the method is the application of variational interpolation of irregularly located Argo measurements to a regular grid followed by model hydrodynamic adjustment of the obtained fields. Such an approach for the Argo data processing makes it possible to obtain a full set of oceanographic characteristics: temperature, salinity, and current velocity. The mean ACC transport over a period of 2005–2014 through the Drake Passage based on the AMIGO data is diagnosed as 162 ± 5 Sv. The transport through the African section south of Cape Town is 0.6 Sv higher due to the Pacific water flow to the Arctic Ocean in the Bering Strait, which then increases the transport in the Atlantic. In the Indian sector the mean ACC transport is increasing by 15.4 Sv to compensate the water flow from the Pacific to the Indian Ocean through the Indonesian Straits (Indonesian Throughflow). Thus, the resulting mean transport between Australia and Antarctica is calculated as 178 ± 6 Sv. These modeling results agree very well with the previous transports calculations based on direct velocity measurements.
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This work was supported by the Russian Science Foundation (project no. 16-17-10149).
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Lebedev, K.V. (2018). Modeling Study of the Antarctic Circumpolar Current Variability Based on Argo Data. In: Velarde, M., Tarakanov, R., Marchenko, A. (eds) The Ocean in Motion. Springer Oceanography. Springer, Cham. https://doi.org/10.1007/978-3-319-71934-4_30
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