Variability of dynamic topography and equatorial currents in relation to hydroclimatic conditions of the Western Pacific

From hydrographical data obtained between 1956 and 1977 in the Western Pacifie, composite transequatorial cruises have been assembled with special references to the hydroclimatic conditions. Geostrophic culculations show interannual variability of the equatorial current system from 100 N to 200 S connected to the appearance of El Nino. Dynamic heights, large before El Nino, become small during post El Nino conditions. The stronger Ninos show a larger decrease. North of 30 N, the dynamic slope is mach stronger in post El Nino than in pre El Nino and this feature corresponds to a larger eastward transport of the North Equatorial Counter Current.