Given the increasing role of river-borne anthropogenically-derived substances on the water quality of impacted marine ecosystems, it is important to study the pathways of the river waters in the Black Sea. We perform tracer simulations for the river-borne substance, aiming to track its transport and accumulation in the basin and to identify possible long term trends. Our results suggest a decrease in Danube plume transport southward along the coastline and increasing transport to the north and north-eastern parts of the North Western Shelf (NWS) and then to the southwest. Over the 1960-2017 period, the Black Sea circulation showed an amplification and consolidation of the Rim Current, most likely in response to climatic changes. Recent changes in the circulation patterns seem to be a key factor for the modification of the river plume pathways. The concentration of the river-borne substance reaches an annual maximum in September, when pulses with larger tracer concentrations can be found in the inner basin. The accumulation of river-borne substance on the north and south shelf has increased in recent decades.

中文翻译：

---

黑海西北部河水的路径和混合。

鉴于河流传播的人为来源的物质在受影响的海洋生态系统的水质中的作用越来越大，因此研究黑海中河流水的路径非常重要。我们对河流中的物质进行示踪剂模拟，以追踪其在盆地中的运输和积累并确定可能的长期趋势。我们的研究结果表明，多瑙河沿海岸线向南的羽状运输量减少，并且增加了对西北大陆架（NWS）北部和东北部再向西南部的运输。在1960-2017年期间，黑海环流显示了环流的放大和合并，最有可能是对气候变化的响应。环流模式的最新变化似乎是改变河羽通道的关键因素。九月份，当在盆地内部发现具有较大示踪剂浓度的脉冲时，河流传播物质的浓度达到年度最高值。近几十年来，北部和南部陆架上的河流传播物质积累有所增加。