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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/gmdd-6-3509-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/gmdd-6-3509-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.

Submitted as: model description paper 28 Jun 2013

Submitted as: model description paper | 28 Jun 2013

Review status
This preprint was under review for the journal GMD but the revision was not accepted.

A coupled two-dimensional hydrodynamic and terrestrial input model to simulate CO2 diffusive emissions from lake systems

H. Wu2,1, C. Peng3,2, M. Lucotte4,2, N. Soumis4,2, Y. Gélinas5, É. Duchemin4,2, J.-B. Plouhinec4,2, A. Ouellet5, and Z. Guo1 H. Wu et al.
  • 1Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Science, P.O. Box 9825, Beijing 100029, China
  • 2Institut des Sciences de l'Environnement, Université du Québec à Montréal, Montréal, QC, H3C 3P8, Canada
  • 3Laboratory for Ecological Forecasting and Global Change, College of Forestry, Northwest A & F University, Yangling, Shaanxi 712100, China
  • 4GEOTOP, Universityof Québec à Montréal, P.O. Box 8888, Montreal H3C 3P8, Canada
  • 5Department of Chemistry and Biochemistry, Concordia University, Montréal, QC, H4B 1R6, Canada

Abstract. Most lakes worldwide are supersaturated with carbon dioxide (CO2) and consequently act as atmospheric net sources. Since CO2 is a major greenhouse gas (GHG), the accurate estimation of CO2 exchanges at air/water interfaces of aquatic ecosystems is vital in quantifying the carbon budget of aquatic ecosystems overall. To date, lacustrine CO2 emissions are poorly understood, and lake carbon source proportions remain controversial, largely due to a lack of integration between aquatic and terrestrial ecosystems. In this paper a new process-based model (TRIPLEX-Aquatic) is introduced incorporating both terrestrial inputs and aquatic biogeochemical processes to estimate diffusive emissions of CO2 from lake systems. The model was built from a two-dimensional hydrological and water quality model coupled with a new lacustrine CO2 diffusive flux model. For calibration and validation purposes, two years of data collected in the field from two small boreal oligotrophic lakes located in Québec (Canada) were used to parameterize and test the model by comparing simulations with observations for both hydrodynamic and carbon process accuracy. Model simulations were accordant with field measurements in both calibration and verification. Consequently, the TRIPLEX-Aquatic model was used to estimate the annual mean CO2 diffusive flux and predict terrestrial dissolved organic carbon (DOC) impacts on the CO2 budget for both lakes. Results show a significant fraction of the CO2 diffusive flux (~30–45%) from lakes was primarily attributable to the input and mineralization of terrestrial DOC, which indicated terrestrial organic matter was the key player in the diffusive flux of CO2 from oligotropical lake systems in Québec, Canada.

H. Wu et al.

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H. Wu et al.

H. Wu et al.

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