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The dynamics on the NorthWestern Shelf area of the Black Sea are examined, with an emphasis on thecirculation induced by buoyancy due to the land drained fresh waters and by theinteraction with the atmosphere, notably wind stress. A three-dimensional,multi-layer hydrodynamic model is employed with realistic topography andparameterisation of river plume physics. We focus on the seasonal patterns oftransport of the river induced low-salinity waters within the Coastal LowSalinity Band and the conditions that influence their removal toward the shelfinterior. The numerical simulations show that coastal circulation is greatlyinfluenced by river runoff and especially in the case of the Danube, which isexcessively high with monthly aver-aged values ranging from 5000 to 10000 m3/s. A significant contribution of runoff comes from the neighbouring rivers. Atthe same time, the North Western Shelf is quite broad, so that the coastaldynamics are largely sheltered from the conditions in the deeper sea. Buoyancydue to river runoff thus dominates, creating a southward coastal current that isthe predominant pathway for the land-drained inputs. As in all shelf areas, windstress is a major circulation forcing mechanism and it modifies the buoyancyinduced flow. It is shown that the seasonal variability in river runoff and windstress, in combination with the shelf topography, determines the differentpathways for the terrestrial inputs. Implications on the overall basincirculation are drawn, as the availability of low-salinity waters of riverorigin affects the upper Black Sea layer. Consequently, the formation ofdistinct water masses (such as the Cold Intermediate Layer) and the propertiesof the outflow toward the Mediterranean are also influenced. Key words. Oceanography: general (continental shelfprocesses; numerical modelling) – Oceanography: physical (air-seainteractions

Modelling the impact of atmospheric and terrestrial inputs on the Black Sea coastal dynamics