Process-based modelling of the methane balance in periglacial landscapes ...

• Main Author: Kaiser, Sonja
• Format: Text
• Language: English
• Published: Friedrich-Schiller-Universität Jena 2017
• Subjects: 550; Ice; lena river; permafrost; Tundra
• Online Access: https://dx.doi.org/10.22032/dbt.34129; https://www.db-thueringen.de/receive/dbt_mods_00034129

A detailed process-based methane module for the global land surface scheme JSBACH has been developed that is general enough to be applied in permafrost regions as well as wetlands outside permafrost areas. Methane production, oxidation and transport by ebullition, diffusion and plants are represented. Oxygen has been explicitly incorporated into diffusion, transport by plants, bulk soil oxidation and rhizospheric oxidation. Permafrost and wetland soils show special behaviour, e.g. variable soil pore space due to freezing/thawing or water table depths due to changing soil water content. This was integrated directly into the methane-related processes. A detailed application at the Samoylov polygonal tundra site, Lena River Delta, was used for evaluation purposes, which shows differences in the importance of the several processes and in the methane dynamics under varying soil moisture, ice and temperature conditions during different seasons and on the two different microsites, the elevated moist polygonal rim ...