Automated greenhouse gas chamber flux measurement system
We use an automated chamber system to measure greenhouse gas fluxes (CO2, CH4, N2O) continuously at the Siikeneva Bog research site in Southern Finland. The autochamber system includes 12 chambers (9 transparent, 3 opaque), split into three clustered locations at an upland forest, a dry bog, and a wet bog. Chambers are designed for cold temperatures, snow, and vegetation in order to ensure operation throughout the year (growing season, fall, winter, and spring) and allow for measurement with a snowpack. The gas from the chambers is analyzed on a Picarro G2508 for CO2, CH4, and N2O concentrations in real time. The gas concentration data is complemented by the measurement of ancillary environmental data, including chamber air temperatures, PAR, soil temperatures, water table level, and soil moisture. Additionally, the data acquisition system for the autochambers allows remote access to data collection system in real time via 4G, ensuring good data coverage and real-time monitoring. The autochamber system was installed in 2020 as part of the ERC Starting Grant “The role of non-growing season processes in the methane and nitrous oxide budgets in pristine northern ecosystems (FluxWIN)”, which aims to quantify the magnitude of biogeochemical fluxes and their underlying processes that occur during the winter and shoulder seasons. In FluxWIN, we focus on carbon and nitrogen biogeochemistry at a research site in southern Finland near Hyytiälä Forestry Research Station. The research project is funded by the European Research Council (ERC) in the Horizon 2020 framework.
Portable laser greenhouse gas analyzers
Three state-of-the art, portable, field-deployable laser gas spectrometers from LGR and Licor for the measurement of CO2, CH4, and H2O have been owned and operated by the Permafrost Region Greenhouse Gas Flux Group since 2020. These analyzers were funded by the Helmholtz Impulse and Networking fund and the Arctic Innovation Lab.
Design and deployment of gas flux chambers for CO2, CH4, and N2O flux measurements
Permafrost Region Greenhouse Gas Flux Group at AWI has extensive experience with the design, construction, and deployment of flux chamber measurements. We installed automated chambers at FluxWIN site (described below) in 2021. We also designed and constructed chambers for manual gas flux with and without cooling systems. We trained 5 students in gas flux chamber methods in 2021.
Method development for new laser gas analyzers for CO2, CH4, and N2O fluxes
Permafrost Region Greenhouse Gas Flux Group at AWI is developing methods to automate the processing of greenhouse gas flux chamber measurements. New, high-frequency data produced by the state-of-the-art laser spectrometers require new solutions to automate data processing to extract the maximum amount of information from these measurements.