The 2013–2014 summer in the Southeast Brazil region set records for negative precipitation anomalies and the highest sea surface temperatures. Such event was attributed to the anomalous presence of atmospheric blocking, which prevented the propagation of a cold front towards the Equator and the establishment of the South Atlantic Convergence Zone, two phenomena that regulate the precipitation regime in this area. These blocking episodes are relatively important to the climate in mid-latitudes, but the feedback of the coastal ocean is still poorly understood under these anomalous conditions. This paper investigates, from a numerical perspective, the impacts on the thermohaline properties and circulation in the South Brazil Bight (SBB). We found that enhanced shortwave radiation leads to intense surface heating and that the presence of northeasterly winds strengthens the coastal upwelling nearby Cabo Frio. The South Atlantic Coastal Waters, transported into the SBB, regulate the extreme heating in the northern half of the domain, while, in the southern half, the absence of cold waters leads to the development of a warm-water pool. The final thermohaline structure induced an enlargement and intensification of the northwestward currents south of São Sebastião Island. Between Ubatuba and Cabo Frio, in the northern half, the northeasterly winds developed an intense surface advection towards offshore, and in the northern region, compensated by an opposite advection, towards the coast. We conclude that the coastal ocean feedback could present extreme anomalous conditions during atmospheric blocking events, leading to impacts upon the thermodynamical properties. Further studies are needed to understand the impacts of these events on biogeochemical properties.

巴西东南部地区2013-2014年夏季创下负降水异常和最高海表温度的记录。此类事件归因于大气阻塞的异常存在，这阻止了冷锋向赤道的传播以及南大西洋收敛带的建立，这是调节该地区降水状况的两种现象。这些阻塞事件对于中纬度地区的气候而言相对重要，但是在这些异常条件下，对沿海海洋的反馈仍然知之甚少。本文从数值角度研究了对巴西南部海岸线（SBB）的热盐特性和循环的影响。我们发现增强的短波辐射会导致强烈的地表加热，并且东北风的存在会增强Cabo Frio附近的沿海上升流。运入SBB的南大西洋沿海水域调节着该区域北半部的极端热量，而在南半部，由于缺乏冷水而导致了温水水池的发展。最终的热盐结构引起了圣塞巴斯蒂昂岛以南的西北向洋流的扩大和增强。在北半部的乌巴图巴（Ubatuba）和卡波弗里奥（Cabo Frio）之间，东北风向海上形成了强烈的平流，而在北部地区，海岸则形成了对流的平流。我们得出的结论是，沿海海洋反馈在大气阻塞事件期间可能会出现极端异常情况，从而影响热力学性质。需要进一步研究以了解这些事件对生物地球化学特性的影响。