Modeling methane emissions from arctic lakes: Model development and site‐level study
Abstract
Abstract To date, methane emissions from lakes in the pan‐arctic region are poorly quantified. In order to investigate the response of methane emissions from this region to global warming, a process‐based climate‐sensitive lake biogeochemical model was developed. The processes of methane production, oxidation, and transport were modeled within a one‐dimensional sediment and water column. The sizes of 14 C‐enriched and 14 C‐depleted carbon pools were explicitly parameterized. The model was validated using observational data from five lakes located in Siberia and Alaska, representing a large variety of environmental conditions in the arctic. The model simulations agreed well with the measured water temperature and dissolved CH 4 concentration (mean error less than 1°C and 0.2 μM, respectively). The modeled CH 4 fluxes were consistent with observations in these lakes. We found that bubbling‐rate‐controlling nitrogen (N 2 ) stripping was the most important factor in determining CH 4 fraction in bubbles. Lake depth and ice cover thickness in shallow waters were also controlling factors. This study demonstrated that the thawing of Pleistocene‐aged organic‐rich yedoma can fuel sediment methanogenesis by supplying a large quantity of labile organic carbon. Observations and modeling results both confirmed that methane emission rate at thermokarst margins of yedomamore »
- Authors:
-
- Department of Earth Atmospheric and Planetary Sciences Purdue University West Lafayette Indiana USA
- Department of Earth Atmospheric and Planetary Sciences Purdue University West Lafayette Indiana USA, Department of Agronomy Purdue University West Lafayette Indiana USA
- Water and Environmental Research Center, University of Alaska Fairbanks Fairbanks Alaska USA
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1295956
- Alternate Identifier(s):
- OSTI ID: 1295957
- Resource Type:
- Published Article
- Journal Name:
- Journal of Advances in Modeling Earth Systems
- Additional Journal Information:
- Journal Name: Journal of Advances in Modeling Earth Systems Journal Volume: 7 Journal Issue: 2; Journal ID: ISSN 1942-2466
- Publisher:
- American Geophysical Union (AGU)
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Tan, Zeli, Zhuang, Qianlai, and Walter Anthony, Katey. Modeling methane emissions from arctic lakes: Model development and site‐level study. United States: N. p., 2015.
Web. doi:10.1002/2014MS000344.
Tan, Zeli, Zhuang, Qianlai, & Walter Anthony, Katey. Modeling methane emissions from arctic lakes: Model development and site‐level study. United States. https://doi.org/10.1002/2014MS000344
Tan, Zeli, Zhuang, Qianlai, and Walter Anthony, Katey. Sat .
"Modeling methane emissions from arctic lakes: Model development and site‐level study". United States. https://doi.org/10.1002/2014MS000344.
@article{osti_1295956,
title = {Modeling methane emissions from arctic lakes: Model development and site‐level study},
author = {Tan, Zeli and Zhuang, Qianlai and Walter Anthony, Katey},
abstractNote = {Abstract To date, methane emissions from lakes in the pan‐arctic region are poorly quantified. In order to investigate the response of methane emissions from this region to global warming, a process‐based climate‐sensitive lake biogeochemical model was developed. The processes of methane production, oxidation, and transport were modeled within a one‐dimensional sediment and water column. The sizes of 14 C‐enriched and 14 C‐depleted carbon pools were explicitly parameterized. The model was validated using observational data from five lakes located in Siberia and Alaska, representing a large variety of environmental conditions in the arctic. The model simulations agreed well with the measured water temperature and dissolved CH 4 concentration (mean error less than 1°C and 0.2 μM, respectively). The modeled CH 4 fluxes were consistent with observations in these lakes. We found that bubbling‐rate‐controlling nitrogen (N 2 ) stripping was the most important factor in determining CH 4 fraction in bubbles. Lake depth and ice cover thickness in shallow waters were also controlling factors. This study demonstrated that the thawing of Pleistocene‐aged organic‐rich yedoma can fuel sediment methanogenesis by supplying a large quantity of labile organic carbon. Observations and modeling results both confirmed that methane emission rate at thermokarst margins of yedoma lakes was much larger (up to 538 mg CH 4 m −2 d −1 ) than that at nonthermokarst zones in the same lakes and a nonyedoma, nonthermokarst lake (less than 42 mg CH 4 m −2 d −1 ). The seasonal variability of methane emissions can be explained primarily by energy input and organic carbon availability.},
doi = {10.1002/2014MS000344},
journal = {Journal of Advances in Modeling Earth Systems},
number = 2,
volume = 7,
place = {United States},
year = {Sat Apr 11 00:00:00 EDT 2015},
month = {Sat Apr 11 00:00:00 EDT 2015}
}
https://doi.org/10.1002/2014MS000344
Web of Science
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