The Lena plume dynamics in the Lena Delta region of the Laptev Sea are explored in simulations performed with the Finite Volume Coastal Ocean Model (FVCOM) on a mesh with the horizontal resolution 0.4–5 km. The impact of wind and tides on the Lena plume propagation is analysed based on simulations for the summer season of 2008 and also on idealised experiments. All main Lena River freshwater channels(Trofimovskaya, Bykovskaya, Tumatskaya and Olenekskaya) produce buoyant outflows in the summer season.The surface plume buoyancy signature proves to be highly variable in time, especially in case of upwelling favourable wind events.Winds stronger than 6 m s−1 can already turn the dynamics of flows from all main freshwater channels to the wind-driven state. During the summer season, the bulk of freshwater from the Lena River stays in the eastern Laptev Sea because of location of the main Lena River freshwater channels, their large Kelvin numbers and light summer winds. Westward and northward plume excursions are wind-driven, and the model skill in simulating them depends on the available wind forcing. The main mechanism of tidal influence in the freshwater plume zone is through tidally induced mixing, except for the northern vicinity of the delta, where residual circulation may contribute to the plume eastward transport significantly.
AWI Organizations > Biosciences > Shelf Sea System Ecology
AWI Organizations > Biosciences > Coastal Ecology
AWI Organizations > Climate Sciences > Observational Oceanography
AWI Organizations > Climate Sciences > Climate Dynamics
Helmholtz Research Programs > PACES II (2014-2018) > TOPIC 2: Fragile coasts and shelf sea > WP 2.5: Interface processes and physical dynamics of the coastal ocean
Helmholtz Research Programs > PACES II (2014-2018) > TOPIC 3: The earth system from a polar perspective > WP 3.3: From process understanding to enabling climate prediction