Atlantic Equatorial Undercurrent intensification counteracts warming-induced deoxygenation

South Equatorial Undercurrent in the western to central tropical Atlantic

[1] The South Equatorial Undercurrent (SEUC) in the western to central tropical Atlantic is investigated by a combination of shallow floats, with a few acoustically tracked, shipboard current measurements and hydrography. Float trajectories show a well confined SEUC revealing large standing meanders near its western origin. Transports determined from 31 sections across the SEUC increase from 5....

Internal Wave Generation in the Equatorial Undercurrent

The generation of internal waves in the equatorial undercurrent is studied using a large-eddy simulation (LES) model. The model is forced with a constant easterly windstress and diurnal heating and cooling. Internal waves are generated with typical horizontal wavelengths of about 250 m, consistent with observations and comparable to the wavelengths of the most unstable modes from linear instabi...

The Asymmetric Nature of the Equatorial Undercurrent in the Pacific and Atlantic*

The structure of the Equatorial Undercurrent in a two-hemisphere ocean is studied, using a simple ideal-fluid model in which both potential vorticity and the Bernoulli function are conserved along streamlines. For the case of a symmetric forcing, the solution is reduced to the case discussed in previous studies. For the case of asymmetric forcing, the western boundary current from the hemispher...

Pathways into the Pacific Equatorial Undercurrent: A Trajectory Analysis

A time-dependent trajectory algorithm is used to determine the sources of the Pacific Equatorial Undercurrent (EUC) in a global climate model with 1/4 degree (eddypermitting) resolution and forced with realistic winds. The primary sources and pathways are identified and the transformation of properties in temperature/salinity space are explored. An estimate for the quantity of recirculation, a ...

A Comparison of Equatorial Undercurrent: POP2 Model and Measurement