The Southeast U.S. is a unique and exciting place – undergoing rapid reforestation and urbanization – to probe atmospheric chemistry. Over the course of the last half-century, it is one of the few regions to exhibit a less-than-predicted-warming trend in response to climate change [Portmann et al., 2009, PNAS]. The combination of increasing natural and man-made emissions resulting in the growth of secondary organic aerosols has been attributed as a potential cause [Goldstein et al., 2009, PNAS]. The primary mission of the Southeast Nexus (SENEX) campaign in June-July of 2013 was to study how the interaction between biogenic and anthropogenic emissions influence air quality and climate. Our HR-ToF-CIMS instrument – among several others – was deployed aboard the NOAA WP-3D aircraft to measure a suite of atmospheric constituents, with a special focus on the precursors of these secondary organic aerosols.
During the course of this field campaign – the first ever flight deployment of a Aerodyne–TofWerk–UW HR-ToF-CIMS – the aircraft flew over regions with significant biogenic, anthropogenic, biomass burning, power generation plants and oil field emissions under both day and nighttime conditions. The instrument obtained data over the course of 17 science flights totaling more than 125 flight hours.