Vol. 33 No. 3 (1994)
Articles

Propagación de variaciones de baja frecuencia en la temperatura superficial del Pacífico nor-oriental

Hugo Herrera Cervantes
Bio
Alejandro Parés Sierra
Bio

Published 1994-07-01

How to Cite

Herrera Cervantes, H., & Parés Sierra, A. (1994). Propagación de variaciones de baja frecuencia en la temperatura superficial del Pacífico nor-oriental. Geofísica Internacional, 33(3), 469-486. https://doi.org/10.22201/igeof.00167169p.1994.33.3.1184

Abstract

We study the propagation of low frequency variability of sea surface temperature (SST) data (1982-1989) in the north eastern Pacific Ocean. The analysis shows that the SST interannual variability is associated with the El Niño event of 1982-83. This event appears as a front parallel to the coast and as a warm water intrusion from the ocean interior.

The first eigenfunction (61%) is associated with the mature phase of El Niño, and its westward propagation from the coast. The second eigenfunction (29%) is associated with an intrusion from the interior induced by large-scale advection generated by an intensification of the central Pacific winds. This signal is out of phase with the coastal signal by about 18 months. The west­ward propagation speed of the coastal signal was estimated to be from 3.4 to 1.7 km/day for latitudes less than 25º. The speed and form of this large-scale wave conforms with the theoretical characteristics of a Rossby wave.

KEY WORD: Low frequency signals, Rossby ware, SST.