MODELING THE SEASONAL VARIABILITY OF MARINE ECOSYSTEMS IN THE SHELF ZONE OF THE LAPTEV SEA

V. A. Ryabchenko, V. V. Galtsova, A. Yu. Dvornikov, M. A. Nitishinskii, and S. S. Pugalova

A one-dimensional (in the vertical) physicobiological model of the coastal zone with ice cover and horizontal transport taken into account has been developed. The model correctly simulates the main features of seasonal variations in physical and biogeochemical characteristics at a location not far from the Lena River delta in the Laptev Sea. Numerical experiments with the model show that the major consequences of the influence of the river runoff on the Laptev Sea marine ecosystem are a change in the light extinction, a decrease in photosynthetically active radiation, a reduction in primary production, and subsequent significant changes in other ecosystem variables. The functioning of the ecosystem, however, depends little on river inputs of dissolved forms of inorganic nitrogen. The river input of dissolved inorganic carbon to the coastal zone significantly affects only its concentration and CO2 exchange with the atmosphere and has no substantial effect on other characteristics of the marine ecosystem.

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