Demonstration of a New Capability for Airborne Measurement of Carbon Dioxide Fluxes and Accurate Mixing Ratios: Preliminary Results from GOTEX and ACME

A new instrument was developed for airborne carbon dioxide measurements. Control of time response allows operation in two modes for application to either eddy covariance or highly precise mixing ratio measurements. Results of Pacific marine boundary layer flux observations during the Gulf of Tehuantepec Experiment (GOTEX) will be presented, including quantification of instrumental air motion sensitivity. Preliminary spectral analysis of flight data indicates a 5-Hz frequency response. The instrument was tuned for mixing ratio precision, with concomitant reduction in time response, during the Airborne Carbon in the Mountains Experiment. Performance will be assessed, including accuracy estimates derived from intercomparison activities.