We have simulated the influence of the Lena River heat and fresh water ux on the Laptev Sea shelf water state based on the coupled regional ocean-ice model and the subsea permafrost model. The numerical results show the variability of the summer hydrological fields on the shelf caused by the atmosphere dynamics variability. We have obtained the eastward spreading of the Lena River water and a negative salinity anomaly to the east of the Lena Delta during the cyclonic regime and northward freshwater advection from the Lena Delta during the anticyclonic regime. The heat flux caused by the summer river run-off increases the bottom water temperature in the Laptev Sea shelf and can affect the submarine permafrost state.

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