Platform: NOAA-CHEM Twin Otter Instruments
Iodide-based Chemical Ionization Time-of-Flight Mass Spectrometer (I- ToF CIMS)
University of Washington Department of Atmospheric Sciences measurements of Acids (HNO3, HONO, Organics), acid gases (N2O5, ClNO2), Oxygenated organics, Organic nitrates, Halogens
- Controls on near-field oxidation, day and night
- Calibrated radical sources: HONO, N2O5 (constraint on NO3), ClNO2, Cl2
- Oxidation products: HNO3, RiONO2
- Volatility distribution of organic carbon vapors, its evolution downwind, and variation across fire types and time of day.
- 100s of OVOC covering wide range of volatility space (IVOC, SVOC, LVOC, ELVOC)
- Couplings between reactive nitrogen and organic carbon that affect aerosol evolution and properties
- Semi and low volatility RiONO2 from NO3 + VOC vs RO2 + NO, aromatic vs BVOC (isoprene, monoterpenes, etc); NO3 + RC(O)H → HNO3 + R'
- Light absorbing secondary organic aerosol (SOA) products