3D Geostrophy and Volume Transport in the Southern Ocean

• Published in: Remote Sensing
• Main Authors: Vigo, Isabel, Garcia-Garcia, David, Sempere, María Dolores, Chao, Benjamin F.
• Other Authors: Universidad de Alicante. Departamento de Matemática Aplicada, Geodesia Espacial y Dinámica Espacial, Métodos Estadístico-Matemáticos para el Tratamiento de Datos de Observación de la Tierra (MEMOT)
• Format: Article in Journal/Newspaper
• Language: English
• Published: MDPI 2018
• Subjects: Ocean geostrophy; Water volume transport; Satellite geodesy; Space gravity; Altimetry; Argo; Southern Ocean; Antarctic Circumpolar Current (ACC); Matemática Aplicada; Antarctic; Drake Passage; Antarc*
• Online Access: http://hdl.handle.net/10045/75289; https://doi.org/10.3390/rs10050715

The 3D geostrophic currents and the associated volume transport (VT) can be estimated from the GOCE and Altimetry satellite data and in-situ temperature and salinity profiles measured by the Argo floats. We do so for the Southern Ocean between 20°S and 65°S with their time variability down to the depth of 1975 m (in 58 layers) over the 11-year period of 2004–2014. The results depict the Southern Ocean circulation where a zonal Antarctic Circumpolar Current (ACC) interacts with a meridional thermohaline circulation. The VT reproduces the polar front and the subantarctic front of the ACC, as well as the large scale and mesoscale currents in the Southern Ocean. Our estimates for the Agulhas current and the East Australia currents are also quantitatively comparable with results from other approaches in the literature based on in-situ data. For ACC, the estimated VT at the Drake Passage is 185 Sv for the norm of the time average VT, or 202 Sv for the mean of the norms of the monthly VT, which are larger than previous estimations (ranging from 134 to 175 Sv). The estimate is potentially reconciled when only the zonal transport is considered (181 Sv). The Drake Passage total VT appears to be quite stable during the studied period, unlike its (dominant) zonal and meridional components which show higher variability that mostly compensate each other. The spatially averaged ACC VT shows per 1° width in the main stream a mean value of 29.6 Sv or 35.8 Sv (depending on the method used), an annual signal with an amplitude of 0.33 ± 0.06 Sv that peaks in early April, with no significant semi-annual signals nor linear trend. Water transports of barotropic and baroclinic origin have been isolated in the VT series showing that 75% of transport is barotropic and the remaining 25% baroclinic, while the variability and annual signal in the ACC is fully barotropic. This research was funded by Taiwan MoST grant number106-2116-M-001-013.