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
InstrumentStationSpecies MeasuredInvestigatorsInstitution
Picarro CRDS1CO, CO2, CH4, H2OColm SweeneyNOAA ESRL GMD
Met Probe & Diff GPS1RH, Temp, Pres, Winds, GPS, flight dataMike Robinson, Steve BrownNOAA ESRL CSD
Tenax cartridge autosampler1Speciated VOCKelley Barsanti, Lindsey Hatch, Avi Lavi, Paul Van RooyUC Riverside
I- ToF CIMS2Acids (HNO3, HONO, Organics), acid gases (N2O5, ClNO2), Oxygenated organics, Organic nitrates, HalogensJoel Thornton, Brett Palm, Carley Fredrickson
Zach Decker
University of Washington
Aerosol Mass Spectrometer (AMS)3Non-refractory PM1 aerosol compositionAnn Middlebrook, Ale Franchin
Kathy Hayden, Shao-Meng Li
Ultra-High Sensitivity Aerosol Spectrometer (UHSAS)3aerosol size distributions from 70 to 1000 nmAle Franchin, Ann MiddlebrookNOAA ESRL CSD
Continuous Light Absorption Photometer (CLAP)3aerosol light absorption coefficientAle Franchin, Ann MiddlebrookNOAA ESRL CSD
Brown Carbon PiLS4aSpectrally resolved aerosol absorptionRebecca Washenfelder
Lisa Azzarallo
York University
Chemiluminescence4b FloorNO, NO2, O3Andy Weinheimer, Denise Montzka, Geoff Tyndall, Frank FlockeNCAR
TRAC Sampler4aParticle composition, mixing state, morphologyAlex Laskin, Jay Tomlin, Kevin JankowskiPurdue University
Offline WSOC analysis4aParticle compositionCora Young, Lisa AzzaralloYork University
jNO2 headsCamera portNO2 photolysis ratesMike RobinsonNOAA ESRL CSD