Water exchanges between the Tyrrhenian Sea and the Liguro-Provençal basin occur through the Corsica Channel, a narrow passage between Corsica and the Elba Island, near the Italian coast. It has long been known that the Channel hosts a robust Tyrrhenian outflow in winter, which penetrates far into the Ligurian Sea, reaching the site where deep-water formation takes place. The summer circulation in the area, and, more generally, in the eastern part of the Ligurian Sea, is less well known. Several experimental and modelling works in the last decade have pointed out the presence of an anticyclone in the Channel area, sometimes referred to as Ligurian anticyclone, which could modulate the exchanges between the two basins in summer, and could strongly affect the dispersion properties in the south-eastern Ligurian Sea, with implications on the local, delicate marine environment. In this work, we focus on this structure, and on the role it plays in the local circulation, seeking information from long datasets of satellite observations (sea level, sea surface temperature and turbidity) that are now available. We find that the Ligurian anticyclone is a recurrent feature of the local circulation in summer. Its core is located between Cap Corse (the peninsula at the northern end of Corsica) and the Elba Island, but the anticyclone may extend till the Italian coast, and it may sometimes be more elongated in the latitudinal direction, and/or more displaced towards north. In some years, a companion anticyclonic vortex is found more to the north, in the north-eastern portion of the Ligurian Sea, but the robustness of this structure is unclear. Analysis of the ERA5 winds indicates that the Ligurian anticyclone is likely driven by an area of negative wind stress curl usually present near Cap Corse in summer, even though contributions from the surrounding circulation cannot be a priori excluded.

第勒尼安海与利古罗-普罗旺斯盆地之间的水交换通过科西嘉海峡发生，科西嘉海峡是科西嘉岛和意大利海岸附近的厄尔巴岛之间的狭窄通道。长期以来，人们一直知道海峡在冬季有大量的第勒尼安河流出，该河水深入利古里亚海，到达发生深水的地方。该地区以及更普遍的利古里亚海东部的夏季环流鲜为人知。过去十年中的几项实验和建模工作指出，在海峡地区存在反旋风器，有时也称为利古里亚反旋风器，它可能在夏季调节两个盆地之间的交换，并可能强烈影响该地区的分散性。东南利古里亚海，对当地有影响，精致的海洋环境。在这项工作中，我们将重点放在这种结构及其在当地环流中的作用，从现在可用的卫星观测数据（海平面，海面温度和浊度）的长数据集中寻求信息。我们发现，利古里亚反气旋是夏季局部循环的复发特征。它的核心位于科西嘉岛（科西嘉岛最北端的半岛）和厄尔巴岛之间，但反气旋可能会一直延伸到意大利海岸，有时反而会在纬度方向上拉长，和/或向北。几年来，在利古里亚海的东北部以北发现了一个伴生的反气旋涡，但这种结构的坚固性尚不清楚。