| Autor: |
Barbot, Simon, Petrenko, Anne, Maes, Christophe |
| Předmět: |
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| Zdroj: |
Biogeosciences Discussions; 2018, p1-1, 1p |
| Abstrakt: |
Thanks to the autonomous Argo floats of the OUTPACE cruise and of the THOT project, some features of intermediate flow dynamics, around 1000 m depth, within the Southwest and Central Pacific Ocean (156° E–150° W, around 19° S) are described. In the Coral sea, we highlight minima in dissolved oxygen of 140 μmol kg−1 that are associated with the signature of a southward transport of waters between two zonal jets: from the North Vanuatu Jet to the North Caledonia Jet. This transport takes place in the core of a cyclonic eddy or via the path between a cyclonic eddy and an anticyclonic one, highlighting the importance of mesoscale dynamics in upper thermocline and surface layers. Further east, we observe a strong meridional velocity shear with long-term float trajectories going either eastward or westward in the lower thermocline. More interestingly, these trajectories also exhibit some oscillatory features. Those trajectories can be explained by a single Rossby wave of 160 days period and 855 km wavelength. Considering the thermohaline context, we confirm the meridional shear of zonal velocity and highlight a permanent density front that corresponds to the interface between Antarctic Intermediate Waters and North Pacific Deep Waters. Hence both circulation and thermohaline contexts are highly favorable to instabilities and wave propagation. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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