Hysteretic temperature sensitivity of wetland CH4 fluxes explained by substrate availability and microbial activity: Model Archive ...

• Main Authors: Chang, Kuang-Yu, Riley, William
• Format: Dataset
• Language: English
• Published: Next Generation Ecosystems Experiment - Arctic, Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (US) 2020
• Subjects: 54 ENVIRONMENTAL SCIENCES; Methane cycling; EARTH SCIENCE > BIOSPHERE > ECOLOGICAL DYNAMICS; Microbial dynamics; EARTH SCIENCE > CLIMATE INDICATORS > PALEOCLIMATE INDICATORS; EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC CHEMISTRY; Climate change; permafrost
• Online Access: https://dx.doi.org/10.5440/1635534; https://www.osti.gov/servlets/purl/1635534/

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" in the Journal Biogeosciences (https://doi.org/10.5194/bg-17-5849-2020), 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 ...