2007/12/01 by Mauro Cirano, Guilherme C. Lessa, Guilherme Camargo Lessa · 161 citations
Earth and Planetary Sciences · Environmental Science · #Bay #Coastal and Marine Management #Coastal wetland ecosystem dynamics #Environmental science #Estuary #Geology #Hydrology (agriculture) #Marine and coastal ecosystems #Oceanography #Salinity #Temperature salinity diagrams
paper · pdf · doi:10.1590/s0102-261x2007000400002
published in Brazilian Journal of Geophysics 25(4), 363-387 (Brazilian Society of Geophysics)
crossref issued 2007/12/01 · crossref published 2007/12/01 · crossref published-online 2007/12/01 · openalex publication_date 2007/12/01 · crossref created 2008/03/13 · crossref deposited 2016/12/15 · openalex created_date 2025/10/10 · crossref indexed 2026/07/30 · openalex updated_date 2026/07/30
Based on a vast set of in situ data, a first comprehensive overview of the oceanographic characteristics of Baía de Todos os Santos (BTS) is provided. BTS is the second largest coastal bay in Brazil (maximum area of 1223 km² and average depth of 9.8 m), and is located in the northeast Brazil, in the vicinity of Salvador city. The circulation inside the bay is mostly tidally driven and does not vary significantly throughout the year. On the other hand, the wet (winter) and dry (summer) seasons does alter significantly the distribution of water properties inside the BTS. During summer, the waters inside the bay have oceanic characteristics, with Tropical Water (TW) penetrating along the whole region, except for the mouth of Rio Paraguaçu. The water temperature inside the bay is higher than in the coastal zone, and variations can be up to 3°C, reaching a maximum of nearly 30°C. During winter, with the increase of freshwater inflow, salinity variations of about 4 are observed between the innermost stations inside BTS and the adjacent coastal region. Salinity values inside the bay can be as low as 32.3, inhibiting the penetration of TW into the BTS, which is totally occupied by a locally formed Coastal Water (CW). An evaluation of the flushing time is also provided and shows that during summer, a 60-fold increase can be observed compared to winter (38 days). While the circulation does not vary seasonally inside the bay, the associated inner shelf is characterized by two different scenarios. During summer, the upwelling favorable easterlies drive a southwestward flow, while during winter the more frequent occurrence of cold fronts (southerly winds) tend to reverse the circulation.