LAKE 2.0: A model for temperature, methane, carbon dioxide and oxygen dynamics in lakes

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Stepanenko , V , Mammarella , I , Ojala , A K , Miettinen , H M , Lykosov , V N & Vesala , T V 2016 , ' LAKE 2.0: A model for temperature, methane, carbon dioxide and oxygen dynamics in lakes ' , Geoscientific Model Development , vol. 9 , no. 5 , pp. 1977-2006 . https://doi.org/10.5194/gmd-9-1977-2016

Title: LAKE 2.0: A model for temperature, methane, carbon dioxide and oxygen dynamics in lakes
Author: Stepanenko, Viktor; Mammarella, Ivan; Ojala, Anne Kristiina; Miettinen, Heli Marjaana; Lykosov, V.N.; Vesala, Timo Veikko
Other contributor: University of Helsinki, Department of Physics
University of Helsinki, Environmental Sciences
University of Helsinki, Environmental Sciences
University of Helsinki, Department of Physics






Date: 2016
Language: eng
Number of pages: 30
Belongs to series: Geoscientific Model Development
ISSN: 1991-959X
DOI: https://doi.org/10.5194/gmd-9-1977-2016
URI: http://hdl.handle.net/10138/164474
Abstract: A one-dimensional (1-D) model for an enclosed basin (lake) is presented, which reproduces temperature, horizontal velocities, oxygen, carbon dioxide and methane in the basin. All prognostic variables are treated in a unified manner via a generic 1-D transport equation for horizontally averaged property. A water body interacts with underlying sediments. These sediments are represented by a set of vertical columns with heat, moisture and CH4 transport inside. The model is validated vs. a comprehensive observational data set gathered at Kuivajarvi Lake (southern Finland), demonstrating a fair agreement. The value of a key calibration constant, regulating the magnitude of methane production in sediments, corresponded well to that obtained from another two lakes. We demonstrated via surface seiche parameterization that the near-bottom turbulence induced by surface seiches is likely to significantly affect CH4 accumulation there. Furthermore, our results suggest that a gas transfer through thermocline under intense internal seiche motions is a bottleneck in quantifying greenhouse gas dynamics in dimictic lakes, which calls for further research.
Subject: 1171 Geosciences
1172 Environmental sciences
BOREAL LAKE
GREENHOUSE-GAS
TURBULENCE MODELS
INTERNAL SEICHE
SURFACE-WATER
FLUXES
EMISSIONS
SEDIMENT
PARAMETERIZATION
STRATIFICATION
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