(named for Sir Gilbert Walker by Jacob Bjerknes in 1969) describes the three-dimensional circulation across the tropical Pacific and the displacement of this circulation by El iño and La iña events. [ Normal, El Niño, & La Niña examples
direct cell oriented along the equator; originally used by Bjerknes (1969) to refer to the cell induced by the contrast between the warm waters of the western Pacific and the cooler waters of the eastern Pacific. Variability in this cell is associated with the Southern Oscillation. The term is now sometimes used to refer to the entire chain of eastâ€“west equatorial circulation cells that stretches around the globe. Bjerknes, J., 1969: Tellus, 18, 820â€“829.