LAKE 2.0: a model for temperature, methane, carbon dioxide and oxygen dynamics in lakes
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 prope...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2016-05-01
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| Series: | Geoscientific Model Development |
| Online Access: | http://www.geosci-model-dev.net/9/1977/2016/gmd-9-1977-2016.pdf |
| Summary: | 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 CH<sub>4</sub> transport inside. The model is
validated vs. a comprehensive observational data set gathered at Kuivajärvi
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
CH<sub>4</sub> 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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| ISSN: | 1991-959X 1991-9603 |