Abstract The exact scenario of the propagation of highly saline Marmora Sea waters in the Black Sea basin is not clear. Together with river runoff, they form the prevailing haline stratification of the basin. One regime of their propagation can be the formation of lenses similar to highly salted and warm lenses of the Mediterranean Sea water in the Atlantic Ocean basin. The purpose of this study is the numerical modeling and subsequent analysis of these dynamic structures that form in the Black Sea due to water exchange through the Bosphorus strait. In this case, the main difficulty is the need for high spatial resolution in the strait. The paper provides a brief description of the NEMO ocean-modeling framework used and the features of configuration that make it possible to reproduce the circulation in the basins of the Azov, Black, and Marmara seas with a spatial resolution of 1.16 km. Fields from the ERA5 atmospheric reanalysis are used as the atmospheric forcing. The numerical experiment carried out by us allows reproducing a typical structure of the seasonal variability of the Black Sea rim current and the features of the vertical structure of the basin waters for the period of 2008–2009. The spatial resolution of the results of numerical modeling made it possible to accomplish a high-quality reconstruction of the saltwater dynamics in the basin and at the exit of the Bosphorus strait. Five lenses formed near the strait and captured by the rim current jet were simulated for the period of 2008–2009. They are well-pronounced in the seawater salinity field for the period of 1–2 months. Using one of the lenses as an example, it is shown that its core is located at a depth of about 75 m. The vertical size of the structure is almost 40 m and its horizontal scale is 15 km. The simulation results demonstrate that lens formation events are associated with the gain in the saltwater inflow after storms in the Sea of Marmara basin. Verifying the results of the study can be done based on a specialized field experiment in the Bosphorus region during the periods of the most probable formation of the Black Sea intrapycnocline lenses.

中文翻译：

---

根据盆地环流数值模拟结果的黑海斜内透镜

摘要 黑海盆地高盐度马尔莫拉海水传播的确切情况尚不清楚。它们与河流径流一起形成了流域的主要盐碱层。它们传播的一种方式可能是形成类似于大西洋盆地中地中海海水的高盐度和温暖的透镜体。本研究的目的是对由于通过博斯普鲁斯海峡进行水交换而在黑海中形成的这些动态结构进行数值模拟和后续分析。在这种情况下，主要困难是海峡需要高空间分辨率。该论文简要描述了所使用的 NEMO 海洋建模框架以及能够再现亚速、布莱克、和马尔马拉海，空间分辨率为 1.16 公里。来自 ERA5 大气再分析的场被用作大气强迫。我们进行的数值实验可以再现2008-2009年黑海环流季节性变化的典型结构和流域水域垂直结构的特征。数值模拟结果的空间分辨率使得高质量地重建盆地内和博斯普鲁斯海峡出口处的咸水动力学成为可能。模拟了 2008-2009 年期间在海峡附近形成并被边缘流喷射捕获的五个透镜。它们在 1-2 个月的海水盐度领域中表现良好。以其中一个镜头为例，结果表明，其核心位于约 75 m 的深度。该结构的垂直尺寸接近40 m，水平尺寸为15 km。模拟结果表明透镜形成事件与马尔马拉海盆地风暴后咸水流入的增加有关。可以根据博斯普鲁斯海峡地区最有可能形成黑海内环斜透镜体期间的专业现场实验来验证研究结果。