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ACC Transport

Par olvac — Dernière modification 03/05/2015 16:20

We can monitor the ACC transport and its variability using a combination of altimetry and in-situ hydrographic data from CTDs and the SURVOSTRAL XBTs. Topex/Poseidon altimetry data have been interpolated onto the mean WOCE/SR3 and SURVOSTRAL lines, and the hydrographic data are then used to determine the depth-integrated transport (Rintoul and Sokolov, 2001; Rintoul et al., 2002). A strong correlation was found between the steric height variations and the barotropic transport from the hydrographic data. This regression is then applied to the altimetry data to infer a continuous time series of barotropic transport between 44 S and 49 S (Figure - Rintoul et al., 2002). Their method allows us to determine the seasonal and interannual transport variations, especially in winter when there are very few in-situ data. This transport calculation represents a spatially integrated value, which is less affected by individual measurement errors or mesoscale eddies and meanders.

Acc Transport 1 

The baroclinic transport (from the surface to the bottom) of the circumpolar current, determined from CTD data is estimated at 147 ± 10 Sv across the SR3 section. The variability of this baroclinic transport (relative to 2500 m) is estimated at ~8 Sv from the SURVOSTRAL data. This variability corresponds to only 7% of the total transport (Rintoul et al., 1999). In the deeper layers along SR3, the transport variability is even smaller.


Acc Transport 2

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