Annual variation of CH4 emissions from the middle taiga in West Siberian Lowland (2005-2009): a case of high CH4 flux and precipitation rate in the summer of 2007

作者：Sasakawa M^*; Ito A; Machida T; Tsuda N; Niwa Y; Davydov D; Fofonov A; Arshinov M

来源：Tellus Series B-Chemical and Physical Meteorology, 2012, 64: 17514.

DOI：10.3402/tellusb.v64i0.17514

• methane
• Siberia
• taiga
• West Siberian Lowland
• tower observation

We described continuous measurements of CH4 and CO2 concentration obtained at two sites placed in the middle taiga, Karasevoe (KRS) and Demyanskoe (DEM), in West Siberian Lowland (WSL) from 2005 to 2009. Although both CH4 and CO2 accumulation (Delta CH4 and Delta CO2) during night-time at KRS in June and July 2007 showed an anomalously high concentration, higher ratios of Delta CH4/Delta CO2 compared with those in other years indicated that a considerably higher CH4 flux occurred relative to the CO2 flux. The daily CH4 flux calculated with the ratio of Delta CH4/Delta CO2 and terrestrial biosphere CO2 flux from an ecosystem model showed a maximum in July at the both sites. Although anomalously high flux was observed in June and July 2007 at KRS, only a small flux variation was observed at DEM. The high regional CH4 flux in June and July 2007 at KRS was reproduced using a process-based ecosystem model, Vegetation Integrative Simulator for Trace gases (VISIT), in response to high water table depth caused by the anomalously high precipitation during the summer of 2007.

• 出版日期2012
• 单位中国气象科学研究院