Preprints
https://doi.org/10.5194/egusphere-2022-329
https://doi.org/10.5194/egusphere-2022-329
 
20 Jun 2022
20 Jun 2022
Status: this preprint is open for discussion.

Mechanistic modelling of the variability of methane emissions from an artificial reservoir

Victor Lomov1,4,5, Victor Stepanenko1,2,3, Maria Grechushnikova4,6, and Irina Repina1,3,5 Victor Lomov et al.
  • 1Laboratory of Supercomputer Modeling of the Earth system processes, Research Computing Center, Moscow State University, Moscow, Russia
  • 2Meteorology and Climatology Department, Faculty of Geography, Moscow State University, Russia
  • 3Moscow Center for Fundamental and Applied Mathematics, Moscow, Russia
  • 4Hydrology Department, Faculty of Geography, Moscow State University, Russia
  • 5A.M.Obukhov Institute of Atmosphere Physics, Russian Academy of Sciences, Moscow, Russia
  • 6Institute of Water Problems, Russian Academy of Sciences, Moscow, Russia

Abstract. We present the first mechanistic model LAKE2.3 for prediction of methane emissions from artificial reservoirs. Estimates of CH4 emissions from the Mozhaysk reservoir (Moscow region) surface provided by the model are demonstrated. The annual emission value was 361 tC-CH4 yr-1, the average flux 37.7 mgC-CH4 m-2 day-1. The methane emission according to the model were shown to be in good agreement with the observation data. The ebullition makes the largest contribution to the total emission (up to 95 %). During the heating period, an increase of methane emission is observed both in the model and empirical data with a maximum before the onset of the autumn overturn. Effective parameter for calibrating the diffusion component of methane flux in the model is the potential rate of methane oxidation in the Michaelis-Menten reaction, and the same for ebullition is the temperature dependence parameter for methane production in bottom sediments – q10.

Victor Lomov et al.

Status: open (until 15 Aug 2022)

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Victor Lomov et al.

Victor Lomov et al.

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Short summary
We present the first mechanistic model LAKE2.3 for prediction of methane emissions from artificial reservoirs. Estimates of CH4 emissions from the Mozhaysk reservoir (Moscow region) provided by the model are demonstrated. Methane annual emissions through diffusion, ebullition and downstream degassing according to in situ measurements and model simulations are presented. The experiments with the model allowed to determine the most sensitive model parameters for calibration of methane fluxes.