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Oceanic and atmospheric anomalies of tropical instability waves
Author(s) -
Polito Paulo S.,
Ryan John P.,
Liu W. Timothy,
Chavez Francisco P.
Publication year - 2001
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 - 10.1029/2000gl012400
Subject(s) - wind stress , advection , anomaly (physics) , equator , ekman transport , zonal and meridional , scatterometer , climatology , geology , sea surface temperature , forcing (mathematics) , sea surface height , atmospheric sciences , environmental science , latitude , wind speed , physics , oceanography , geodesy , upwelling , condensed matter physics , thermodynamics
Tropical instability waves (TIWs) are detected in remotely‐sensed sea surface height (SSH), temperature (SST), and wind records of the eastern equatorial Pacific. Analyses of TIW anomaly relationships reveal strong dynamical influence of TIWs within approximately 5° of the equator. The first influence is advective heat flux. The primary forcing of TIW SST anomalies is advection of the meridional temperature gradient by TIW currents. The second influence is modification of the wind stress and Ekman pumping fields by TIW surface ocean currents. By affecting surface stress and hence roughness, TIW currents in this low‐wind region introduce a significant bias in scatterometer vector wind measurement. This bias is evident in both NSCAT and QuikSCAT winds. The difference between wind measurements from TAO moorings and scatterometers is phase‐locked with TIW SST oscillations. These results have important implications for scatterometry and for understanding tropical dynamics, thermodynamics and biogeochemistry.