Satellite microwave SST observations of transequatorial tropical instability waves

• Published in: Geophysical research letters Vol. 27; no. 9; pp. 1239 - 1242
• Main Authors: Chelton, Dudley B., Wentz, Frank J., Gentemann, Chelle L., de Szoeke, Roland A., Schlax, Michael G.
• Format: Journal Article
• Language: English
• Published: Washington, DC Blackwell Publishing Ltd 01.05.2000; American Geophysical Union
• Subjects: Dynamics of the ocean (upper and deep oceans); Earth, ocean, space; Exact sciences and technology; External geophysics; Marine; Physics of the oceans; Equatorial Atlantic current; Pacific Ocean; Pacific Equatorial Current; Tropical Pacific Ocean; Tropical Atlantic Ocean; Atlantic Ocean; IS, Equatorial Pacific; Tropical Atlantic; Tropical Pacific; Sea surface; Satellite observation; Surface temperature; Sea current; Current instability
• ISSN: 0094-8276; 1944-8007
• DOI: 10.1029/1999GL011047

Satellite measurements of sea‐surface temperature (SST) by the TRMM Microwave Imager reveal previously unreported features of tropical instability waves (TIWs). In the Pacific, TIW‐related variability is observed from the eastern boundary to at least 160°E. Cusp‐shaped distortions of SST fronts and associated trains of anticyclonic vortices both north and south of the equator propagate westward at ∼0.5 m s−1 with approximately 50% larger meridional displacements in the north. In the Atlantic, TIWs and associated anticyclonic vortices are clearly observed only on the north side of the equator where they propagate from the eastern boundary to the western boundary at ∼0.3 m s−1.