Japan Geoscience Union Meeting 2019

Presentation information

[E] Poster

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS01] Environmental, socio-economic and climatic changes in Northern Eurasia

Sun. May 26, 2019 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall8, Makuhari Messe)

convener:Pavel Groisman(NC State University Research Scholar at NOAA National Centers for Environmental Information, Asheville, North Carolina, USA), Shamil Maksyutov(National Institute for Environmental Studies), Evgeny P Gordov(Institute of Monitoring of Climatic and Ecological Systems SB RAS), Dmitry A Streletskiy(George Washington University)

[MIS01-P09] Seasonal variation of wetland carbon dioxide and methane fluxes measured by automatic chambers at the Bakchar bog, West Siberia

*Shamil Maksyutov1, Alexandre Fofonov2, Denis Davydov2, Oleg Krasnov2, Tadanobu Nakayama1, Mikhail Glagolev3 (1.National Institute for Environmental Studies, 2.V.E. Zuev Institute of Atmospheric Optics, 3.M.V. Lomonosov Moscow State University)

Keywords:methane emissions, wetland, Siberia, CO2 fluxes

Wetland CO2 and CH4 fluxes were observed at the Bakchar bog (N56°, E82°), West Siberia. Measurements were performed by two solar powered automated systems, each consisting of NDIR Li-820 CO2 analyzer, an SnO2-based methane sensor, six static chambers installed along transects, the air drying and distribution unit, and a datalogger. Observations were made during the May to October period in 2014 to 2017 at two types of open wetlands: mesotrophic open bog and patterned wetland with forested ridges, flat hollows and water pool. Each chamber is automatically opened and closed with pneumatic actuator. Water level is measured in the wetland and surrounding forest locations. Net uptake of CO2 is observed from the beginning of June through the end of August with a maximum from mid-June through the end of July. Seasonal pattern of methane fluxes showed that CH4 emission increases at the beginning of June, then weakens gradually in autumn. Seasonal variation of the emissions correlates well with the soil temperature at 5-10 cm depth. Carbon dioxide and methane fluxes correlate spatially; higher methane emissions are observed at wet mesotrophic locations with higher photosynthesis/respiration rates. Lower CH4 emissions were observed on oligotrophic patterned wetland.