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Kelvin wave and Rossby wave interaction in the extratropical‐tropical Pacific
Author(s) -
Wu Lixin,
Liu Zhengyu,
Hurlburt Harley E.
Publication year - 2000
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/1999gl002368
Subject(s) - thermocline , extratropical cyclone , rossby wave , kelvin wave , geology , climatology , equatorial waves , anomaly (physics) , atmospheric sciences , geophysics , physics , equator , latitude , geodesy , condensed matter physics
The adjustment of the equatorial Pacific thermocline to an initial extratropical thermocline anomaly is studied using analytical and high‐resolution (1/16°) primitive equation numerical models. It is found that the fast adjustment due to the coastal Kelvin wave and equatorial Kelvin and Rossby waves, and the slow adjustment due to the eastern boundary planetary wave play important roles in the redistribution of the initial anomalous mass, thereby determining the phase and magnitude of the equatorial thermocline transition induced by the initial extratropical thermocline transition. For a given extratropical anomaly, both analytical and numerical models show that the equatorial thermocline transition occurs about 2–5 years later, and the magnitude is about 5–10% of the initial anomaly. The mean circulation in the North Pacific intensifies the transition of the equatorial thermocline and reduces the phase‐lag of extratropical‐tropical thermocline transition.