« on: November 09, 2016, 09:26:36 PM »
I think this is important, but i dont know why i think so. I do know that Agulhas affects AMOC, and perhaps vice versa. Kuroshio and East Australia current are broadening also.
"These results indicate that intensifying winds may be increasing the eddy kinetic energy of boundary currents, rather than their mean flow. This could act to decrease poleward heat transport and increase cross-frontal exchange of nutrients and pollutants between the coastal ocean and the deep ocean."
Below, EKE is eddy kinetic energy.
"Our results, together with recent analyses in other western boundary currents, suggest that intensifying winds may act to increase the EKE of boundary currents, rather than their mean flow. This hypothesis draws parallels with the eddy compensation hypothesis for the Antarctic Circumpolar Current in the Southern Ocean, where eddies appear to dampen the effect of increased wind energy input on the mean flow [Ref. 30.] In essence, while winds tend to accelerate the flow and steepen isopycnals, eddies mix laterally across the current to slump the isopycnals. Coupling between eddies and the atmosphere has also been shown to influence this frontal balance [Ref. 31.] The implication of broadening boundary currents is a more porous divide between the continental shelves and the open ocean, leading to greater mixing and cross-frontal exchange. In the Agulhas Current, these changes could also enhance upwelling over the shelf, since the strongest upwelling events are driven by meanders. These implications are in contrast to those of an intensifying flow, which would tend to dampen cross-frontal mixing and increase meridional heat transport.
If western boundary currents are not strengthening, observed patterns of surface warming [Ref. 5,9,10] must be explained by a poleward shift of the ocean gyres."