| Abstract: | Year-long measurements of subsurface current and temperature on Peru's continental shelf included the onset of El Ni?o in 1976 and 1982. The Peru Coastal Undercurrent more than doubled in speed and advected anomalously warm water poleward. El Ni?o began in different seasons in 1976 and 1982, but the current and temperature responses were very similar. Acceleration of poleward flow at 10 degrees S occurred several days after sea level rose at the Galápagos Islands in October 1982, suggesting the onset of El Ni?o propagated as a Kelvin wave. |
