Open AccessGlobal characterization of Rossby waves at several spectral bands
Author(s) -
Polito Paulo S.,
Liu W. Timothy
Publication year - 2003
Publication title -
journal of geophysical research: oceans
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2000jc000607
Subject(s) - rossby wave , rossby radius of deformation , geology , sea surface height , kelvin wave , climatology , amplitude , geophysics , wavelength , equatorial waves , phase velocity , physics , latitude , sea surface temperature , geodesy , equator , optoelectronics , quantum mechanics
Global sea surface height anomaly signals from the TOPEX/Poseidon satellite altimeter from 1992 to 2000 are filtered into several spectral bands. These bands include propagating (Rossby, Kelvin, and tropical instability waves) and nonpropagating (annual and interannual basin‐scale variability and eddies) signals. These signals are decomposed through a series of finite impulse response band‐pass filters. Phase speed, period, wavelength, and amplitude are estimated. Signal‐to‐noise ratio, methodological errors, and natural variability are also estimated. Results are shown for the Pacific, Atlantic, and Indian basins for four Rossby wave components with periods between 3 and 24 months. Equatorial Kelvin waves and tropical instability waves are shown as peripheral results. The clearest and most energetic wave signals are generally observed for annual Rossby waves. Semiannual Rossby waves often have the largest amplitudes near the tropics. The Rossby wave phase speeds are in agreement with the linear theory, except for a ∼25% bias toward high speeds found in mid to high latitudes. This revitalizes the idea that on the average the Rossby wave signal in the ocean is in the form of free waves.