Physics
Scientific paper
Jun 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3511601t&link_type=abstract
Geophysical Research Letters, Volume 35, Issue 11, CiteID L11601
Physics
2
Oceanography: Physical: Eddies And Mesoscale Processes, Oceanography: General: Water Masses, Oceanography: General: Numerical Modeling (0545, 0560)
Scientific paper
Antarctic Intermediate Water (AAIW) injection mechanism into the Atlantic subtropical gyre at the Brazil-Malvinas (B/M) Current confluence is investigated by using an eddy resolving ocean model. The temporal residual-mean (TRM) velocity framework is used to evaluate transport due to eddies. It is found that the AAIW injection is caused by eddy-induced transport. A low potential vorticity (PV) water in Malvinas Current generated in the southeast Pacific and near Burdwood Bank encounters the Brazil Current at the B/M confluence, which has relatively high PV value. Since stirring of eddies transports low PV water into high PV water region, the low PV water in Malvinas Current is injected into Brazil Current. The downward TRM velocity exceeds 3 × 10-5 m s-1 at the confluence, which represents strength of the injection. This strong downward transport forms the low salinity tongue of the Atlantic AAIW in this eddy-resolving ocean model.
Hasumi Hiroyasu
Tanaka Yukio
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