Produção Nacional
Low-frequency variability of sea level along the Mid-Atlantic Coast of South America, in 1983
2012; Brazilian Society of Geophysics; Volume: 30; Issue: 1 Linguagem: Inglês
10.22564/rbgf.vol30n1-2012
ISSN1809-4511
AutoresAlessandro Filippo, Björn Kjerfve, Audálio Rebelo Torres, Alexandre Macedo Fernandes,
Tópico(s)Oceanographic and Atmospheric Processes
ResumoMeteorological events cause pronounced low-frequency sea level variations along the Mid-Atlantic coast of South America. Spectral analysis of hourlysea level data during 1983 from tide gauges at Puerto Madryn and Mar del Plata, Argentina, and Cananeia and Ilha Fiscal, Brazil, yielded energetic variance peaks withperiods between 2 and 28 days, with good coherence among the four gauges. These results suggest that coherent low-frequency sea level disturbances may propagatealong the Mid-Atlantic coast of South America towards the northeast, mostly as barotropic shelf waves. The principal long waves were identified with heights up to 1 m,periods of 7.8 and 9.0 days, with variances of 2.5-5.4 m2 and coherences in the order of 0.88 to 0.98. These long waves recur every 5-16 days, propagate towards theequator with an average phase speed of 11 m/s, and require 77 hours to travel the 3,010 km distance from Puerto Madryn to Ilha Fiscal.
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