Journal
GEOSCIENTIFIC MODEL DEVELOPMENT
Volume 9, Issue 5, Pages 1977-2006Publisher
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/gmd-9-1977-2016
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Funding
- CarLac (Academy of Finland) project [1281196]
- GHG-Lake project
- Russian Foundation of Basic Research (RFBR) [14-05-91752, 15-35-20958]
- Academy of Finland Centre of Excellence [118780]
- Academy Professor projects [1284701, 1282842]
- ICOS [271878]
- ICOS-Finland [281255]
- ICOS-ERIC [281250]
- Nordic Centre of Excellence-DEFROST
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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.
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