Equatorial forcing of interannual Rossby waves in the eastern South Pacific

Details Equatorial forcing of interannual Rossby waves in the eastern South Pacific Equatorial forcing of interannual Rossby waves in the eastern South Pacific

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30e...1v&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 5, pp. 1-1, CiteID 1197, DOI 10.1029/2002GL015886

Physics

17

Oceanography: Physical: Upper Ocean Processes, Oceanography: General: Climate And Interannual Variability (3309), Oceanography: Physical: El Nino

Scientific paper

Long baroclinic Rossby waves generated along the western coasts of continents play an important role in transferring coastal perturbations westwards into the ocean's interior. To investigate interannual Rossby waves in the eastern South Pacific (10°S to 40°S), combined TOPEX/POSEIDON and ERS-1/2 satellite altimeter data were compared with model simulations of Rossby waves for the 1992-2000 period. The multimode linear model includes dissipation and was forced by observed wind stress curl from ERS-1/2 and coastal pycnocline-depth anomalies. The latter were determined by a high-resolution eastern boundary linear model initialized by observed sea level at the equator. Strong westward propagation of pycnocline anomalies originating at the coast can be observed at least as far south as 40°S. The results suggest that an important part of the interannual mid-latitude, free baroclinic Rossby waves originated at the coast were forced by pycnocline fluctuations originating from the equator in 1992-2000, a period which was dominated by the 1997-98 El Niño event.

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