Platform: NOAA-CHEM Twin Otter Payload

The NOAA-CHEM Twin Otter instrument payload is designed to investigate the nighttime chemical transformation of fire plumes and is capable of monitoring the diurnal variation of the emissions from individual fire plumes. The sampling strategy will involve daytime and nighttime flights, and multiple flights in a day over the viable range of this aircraft to sample emissions, short-range photochemistry, nighttime chemistry and variation in fire intensities over shorter time scales. The range of sampling is anticipated to be on the order of 100 - 200 km downwind of a fire source, corresponding to 3-10 hours of transport time for a range of wind speeds.

aircraft payload schematic
Instrument layout for FIREX-AQ NOAA-CHEM Twin Otter aircraft
StationInstrumentSpecies MeasuredInvestigatorsInstitution
1Picarro CRDSCO, CO2, CH4, H2OColm SweeneyNOAA ESRL GMD
1Met Probe & Diff GPSRH, Temp, Pres, Winds, GPS, flight dataMike Robinson, Steve BrownNOAA ESRL CSD
1Tenax cartridge autosamplerSpeciated VOCKelley Barsanti, Lindsey Hatch, Avi Lavi, Paul Van RooyUC Riverside
2I- ToF CIMSAcids (HNO3, HONO, Organics), acid gases (N2O5, ClNO2), Oxygenated organics, Organic nitrates, HalogensJoel Thornton, Brett Palm, Carley Fredrickson
Zach Decker
University of Washington
3Aerosol Mass Spectrometer (AMS)Non-refractory PM1 aerosol compositionAnn Middlebrook, Ale Franchin
Kathy Hayden, Shao-Meng Li
3Ultra-High Sensitivity Aerosol Spectrometer (UHSAS)aerosol size distributions from 70 to 1000 nmAle Franchin, Ann MiddlebrookNOAA ESRL CSD
3Continuous Light Absorption Photometer (CLAP)aerosol light absorption coefficientAle Franchin, Ann MiddlebrookNOAA ESRL CSD
4aBrown Carbon PiLSSpectrally resolved aerosol absorptionRebecca Washenfelder
Lisa Azzarallo
York University
4b FloorChemiluminescenceNO, NO2, O3Andy Weinheimer, Denise Montzka, Geoff Tyndall, Frank FlockeNCAR
4aTRAC SamplerParticle composition, mixing state, morphologyAlex Laskin, Jay Tomlin, Kevin JankowskiPurdue University
4aOffline WSOC analysisParticle compositionCora Young, Lisa AzzaralloYork University
Camera portjNO2 headsNO2 photolysis ratesMike RobinsonNOAA ESRL CSD