Coastal Trapped Waves Propagation Along The Southwestern Atlantic Continental Shelf
CONTINENTAL SHELF RESEARCH(2021)
摘要
This study investigates the propagation of coastal trapped waves (CTWs) along the Brazilian continental shelf between 34 degrees S and 11 degrees S using in situ data combined with the outputs from a high-resolution ocean simulation with HYCOM. The CTWs generation area covers a wide region ranging from the Patagonian shelf to the southern Brazilian shelf. The spectral analysis of coastal sea level series between 54 degrees S and 10.5 degrees S shows three bands of high energy associated with periods from 5 to 12 days, 15-22 days, and 25-40 days. The energy of the CTWs decreases along their propagation for all frequency bands, showing a drastic reduction north of 22 degrees S, due to abrupt variations in the width and depth of the continental shelf between Tubara similar to o Bight and Abrolhos Bank. Their phase speed propagation varies along the coast, being faster (>25 m/s) in the southernmost region (between 42 degrees S and 41 degrees S), reaching -11 m/s north of 41 degrees S, and reducing to -3 m/s further north (equatorward of 24 degrees S). The free Continental Shelf Wave theory supports the notion that the intense deceleration north of 24 degrees S can be explained by the narrowing of the continental shelf. The stratification parameter indicates that the Brazilian continental shelf has a barotropic response to wind-generated disturbances.
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关键词
Coastal sea level, Continental Shelf Waves, Brazilian continental shelf, Air-sea interaction, Observing systems
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