ИСТИНА

The one-dimensional model LAKE is applied to simulate greenhouse gases (CH4and CO2) in Mozhaiskoe hy-dropower reservoir located in Moscow region.LAKE is an extended one-dimensional model of thermodynamic, hydrodynamic and biogeochemical processes inthe water basin and the bottom sediments (Stepanenko et al. 2016). The equations of the model are formulatedin terms of quantities averaged over the horizontal section a water body, which leads to an explicit account of theexchange of momentum, heat, and dissolved gases between water and the inclined bottom. The equations of motiontake into account the barotropic and baroclinic pressure gradients (Stepanenko, 2018). Besides basic physicalprocesses, the model also describes vertical diffusion of dissolved gases (CO2, CH4, O2), as well as their bubbletransfer, methane oxidation, photosynthesis and processes of oxygen consumption. The aerobic transformations oforganic carbon forms are simulated by vertically distributed version of model presented in (Hanson et al. 2004).For a reservoir with significant throughflow contribution of tributaries and dam outflow into momentum, heat anddissolved gases budgets are included. The pressure gradient parameterization is modified so as to include the massinput and output by tributaries and effluent.The standard meteorological variables from nearby station and discharges of tributaries are involved as input forthe model. Temperature, oxygen, CH4and CO2vertical profiles measured at the stationary mast and during whole-lake surveys at the reservoir are used to validate and calibrate the model. Based in model results, the terms ofgreenhouse gases budgets in the reservoir are assessed.References1. Paul C. Hanson, Amina I. Pollard, Darren L. Bade et al. A model of carbon evasion and sedimentationin temperate lakes // Global Change Biology. — 2004. — Vol. 10, no. 8. — P. 1285–1298. — URL:http://doi.wiley.com/10.1111/j.1529-8817.2003.00805.x.2. Stepanenko, V., Mammarella, I., Ojala, A., Miettinen, H., Lykosov, V., Vesala, T. (2016). LAKE 2.0: a modelfor temperature, methane, carbon dioxide and oxygen dynamics in lakes. Geoscientific Model Development,9(5), 1977–2006. http://doi.org/10.5194/gmd-9-1977-20163. Stepanenko, V. M.: Seiche parameterization for a one-dimensional lake model (In Russian). Trudy MIPT,vol. 10, N 1, pp. 97-111 (2018).