Sea surface height trend and variability at seasonal and interannual time scales in the Southeastern South American continental shelf between 27 degree S and 40 degree S

• Published in: Continental shelf research 2014-12, Vol.91, p.82-94
• Main Authors: Saraceno, Martin, Simionato, Claudia G, Ruiz-Etcheverry, Laura A
• Format: Article
• Language: English
• Subjects: Anomalies; Brackish; Brazil; Coastal environments; Continental shelves; Marine; Satellite altimetry; Shelves; Time; Trends
• ISSN: 0278-4343
• DOI: 10.1016/j.csr.2014.09.002

Recent improvements in satellite altimetry data correction terms are encouraging studies of the remote sensed sea level anomalies (SLA) progressively closer to the coast and over shallow continental shelves. In this paper we describe and discuss the SLA trend and variability at seasonal and interannual time scales in the southeastern South American continental shelf influenced by the Rio de la Plata estuary and the Patos Lagoon fresh waters. The spatio-temporal coverage of the gridded altimetry SLA data allows identify several variability patterns and the associated physical processes. On seasonal time scales, the combination of the solar radiation and wind forcing cycles accounts for up to 98% of the variability. Seasonal variability of the wind is responsible for a difference of up to 16cm between the southern (Argentinean) Rio de la Plata estuary coast and the Uruguayan and southern Brazilian coasts. On interannual time scales, positive/negative SLA anomalies are coherent with El Nino/La Nina events. Finally, a significant positive trend of up to 5mmyr-1 is found in all the study area except in the region around the Patos Lagoon (Brazil) and part of the Rio de la Plata. Besides the local relevance of the results, this study indicates that satellite altimetry data are accurate enough to unveil SLA spatio-temporal patterns close to the coast and over continental shelves in the mentioned time scales.