Operating Manual on Automated Continuous Measurement of Greenhouse Gas Emissions

Agriculture is one of the major sources of greenhouse gases (GHG) which accounts for 10-12% of total anthropogenic GHG emissions. There is increasing interest in quantification of greenhouse gas (GHG) fluxes from agricultural soils. Fluxes of nitrous oxide (N2 O) and nitric oxide (NO) from agricultural soils show high spatial and temporal variations. The manual gas sampling technique, which is done on a weekly or biweekly interval, may not include those variations. The extrapolation of the emissions measured over wide interval of time over a season or a year that may either over- or under-estimate total emissions, is not desirable particularly for GHG emissions mitigation research. Therefore, automated continuous measurement, which includes all the temporal variations, gives a real estimate of GHG fluxes, particularly for N2 O and NO. This manual deals with automated continuous measurement system designed by International Fertilizer Development Center (IFDC) to measure N2 O and NO emissions. The manual briefly discusses the following: • Background of GHG flux measurement. • Construction of automated chambers and their installation in the field. • Components of automated gas sampling and analysis system including their laboratory setup. • Control and datalogging unit. • Analysis of N2 O and NO. • Calculation of GHG fluxes. • Maintenance and monitoring of the system.
Greenhouse gas emissions, Agriculture