Coastal upwelling is a known mechanism that generates favorable conditions for marine life. In this paper, we evaluate the conditions for the development of coastal upwelling in the San Jorge Gulf, on the west coast of the South Atlantic Ocean. The wind-based upwelling indices were calculated for 4 years (2003–2006) in three coastal regions of the gulf with different orientations. Monthly images of sea surface temperature, chlorophyll-a and wind and numerical simulations were used to analyze upwelling conditions. In addition, results of daily images, numerical simulations with daily forcings and CTD sections in the southwestern region of the gulf during the spring of 2016 and 2017 were described. The upwelling indices clearly highlight the differences between the three regions, linked to the basin geometry. Using an average of daily indices in the southwestern part of the gulf, thirteen upwelling events were detected during the warm season (November to March, 2003–2006). Numerical simulations suggest that the drop in surface temperature generated by an upwelling event in the SW region remains cold for more than a week. The wind pattern and CTD profiles during spring 2016 suggested favorable conditions for coastal upwelling compared to the profiles performed in 2017, in which wind do not appear to be upwelling-favorable.

海岸上升流是为海洋生物产生有利条件的已知机制。在本文中，我们评估了南大西洋西海岸圣豪尔赫湾沿海上升流的发展条件。在海湾的三个沿海地区，以不同的方向计算了4年（2003-2006年）的基于风的上升指数。海面温度，叶绿素a的月度图像并使用风和数值模拟来分析上升条件。此外，还描述了2016年春季和2017年春季在墨西哥湾西南地区的日图像，日强迫和CTD断面的数值模拟结果。上升指数清楚地表明了与盆地几何形状有关的三个区域之间的差异。使用海湾西南部的每日平均指数，在温暖季节（2003年11月至3月至2003年3月）检测到13次上升事件。数值模拟表明，西南地区上升事件引起的地表温度下降持续了一个多星期。与2017年的资料相比，2016年春季的风型和CTD资料显示了沿海上升的有利条件，