Hysteretic temperature sensitivity of wetland CH4 fluxes explained by substrate availability and microbial activity: Model Archive
This Modeling Archive is in support of an NGEE Arctic publication ?Hysteretic temperature sensitivity of wetland CH4 fluxes explained by substrate availability and microbial activity? submitted for review to the Journal Biogeosciences, which includes the model data used in the publication. CH4 emiss...
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| Language: | unknown |
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2020
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| Online Access: | http://www.osti.gov/servlets/purl/1635534 https://www.osti.gov/biblio/1635534 https://doi.org/10.5440/1635534 |
| Summary: | This Modeling Archive is in support of an NGEE Arctic publication ?Hysteretic temperature sensitivity of wetland CH4 fluxes explained by substrate availability and microbial activity? submitted for review to the Journal Biogeosciences, which includes the model data used in the publication. CH4 emissions from terrestrial systems are posited to increase, which can offset mitigation efforts and accelerate climate change. Yet, the accuracy of modeled CH4 emissions is sensitive to the prescribed CH4 production (or emission) temperature dependencies that are currently uncertain. Here, we use a comprehensive biogeochemistry model ( ecosys ) to investigate factors modulating CH4 production and emission rates across a permafrost thaw gradient encompassing a partly thawed bog and a fully thawed fen. We find that seasonally varying substrate availability drives lower and higher modeled methanogen biomass and activity, and thereby CH4 production, during the earlier and later periods of the thawed season, respectively. The Next-Generation Ecosystem Experiments: Arctic (NGEE Arctic), was a 10-year research effort (2012-2022) to reduce uncertainty in Earth System Models by developing a predictive understanding of carbon-rich Arctic ecosystems and feedbacks to climate. NGEE Arctic was supported by the Department of Energy?s Office of Biological and Environmental Research. The NGEE Arctic project had two field research sites: 1) located within the Arctic polygonal tundra coastal region on the Barrow Environmental Observatory (BEO) and the North Slope near Utqiagvik (Barrow), Alaska and 2) multiple areas on the discontinuous permafrost region of the Seward Peninsula north of Nome, Alaska. Through observations, experiments, and synthesis with existing datasets, NGEE Arctic provided an enhanced knowledge base for multi-scale modeling and contributed to improved process representation at global pan-Arctic scales within the Department of Energy?s Earth system Model (the Energy Exascale Earth System Model, or E3SM), and specifically ... |
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