Modeling CO2 emissions from Arctic lakes: Model development and site-level study

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TitleModeling CO2 emissions from Arctic lakes: Model development and site-level study
Publication TypeJournal Article
Year of Publication2017
AuthorsTan, Z, Zhuang, Q, Shurpali, NJ, Marushchak, ME, Biasi, C, Eugster, W, Anthony, KWalter
JournalJournal of Advances in Modeling Earth Systems
Date PublishedSep-14-2017
Keywordsand modeling, Arctic lake biogeochemistry, Biogeochemical cycles, Carbon cycling, CO2 fluxes, glacial lakes, lake biogeochemistry model, processes, thermokarst lakes, yedoma lakes

Few lake biogeochemistry models are developed specifically for Arctic lakes which are found to be important in understanding the global carbon cycle. In this study, we developed a one-dimensional process-based lake biogeochemistry model that explicitly simulates the dynamics of organic and inorganic carbon in Arctic lakes. By realistically modeling water mixing, carbon biogeochemistry, and permafrost carbon loading, the model can reproduce the seasonal variability of CO2 fluxes from the study Arctic lakes. The simulations show that for the global carbon cycle the relative contribution of glacial lakes could be the largest because of their much larger surface area and high carbon oxidation and loading, and the overall contribution of sunlight-induced organic carbon oxidation is limited due to the limitation of UV energy. Importantly, this lake model can simulate the whole-lake carbon balance of Arctic lakes, a difficult task for field and laboratory experiments and other biogeochemistry models.

Short TitleJ. Adv. Model. Earth Syst.