INFLUX

The Indianapolis Flux Experiment (INFLUX) was designed to develop and assess the best methods of quantifying greenhouse gas fluxes from urban environments, using Indianapolis as the test site. The observation network includes:

• In-situ, tower-based continuous measurements of CO₂, CH₄, and CO

• Periodic aircraft sampling of greenhouse gases and meteorological conditions

• A scanning Doppler lidar used to determine 3-D wind fields and boundary layer depth

• Eddy covariance flux measurements of land surface fluxes of greenhouse gases, energy and momentum

• Tower-based flask samples of 14CO₂ and other long-lived trace gases

The project aims at comparing top-down measurements with the bottom-up estimates from Hestia for Indianapolis, and investigators use these results to improve both Hestia and the atmosphere-based flux quantification methods.