Platform: NOAA Twin Otter Payload

Twin Otter measurements
The NOAA Twin Otter contains a unique instrument package for dynamics and ozone photochemistry

The primary NOAA Twin Otter measurement system will be the downward-pointing Micro-Doppler Lidar developed by NOAA CSL Atmospheric Remote Sensing program, which will measure winds and turbulent fluctuations with sufficient resolution (vertical and horizontal) to characterize variations in these quantities over regional/urban scales represented by air-quality models. Model performance will be evaluated by tracking the temporal and spatial evolution of pollutant plumes downwind of the major northeast-corridor urban centers. Airborne, in-situ, gas phase concentrations of CO, CO2, O3, H2O, CH4 will also be made on the NOAA Twin Otter to aid in air-mass identification and characterization of the spatial extent of the plume. The airborne wind and chemistry measurements will be augmented by those made by scanning ground-based Doppler lidars separately deployed to the area of study by other researchers, and by greenhouse-gas concentrations monitored by the NIST Greenhouse Gas Measurement Testbed and Mole Fraction Measurement Network – Northeast Corridor-Baltimore/Washington NEC/BW).

aircraft payload schematic
Confirmed instrument layout for NOAA Twin Otter aircraft
Species MeasuredTechniquePrinciple InvestigatorInstitution
Horizontal wind, turbulence and aerosol backscatter intensity profilesMicro-pulse Scanning Doppler lidarAlan Brewer, Amanda MakowieckiNOAA CSL
Multi spectral irradianceMulti channel radiometerAlan BrewerNOAA CSL
NO2, glyoxal, and HCHO column, and profilesAirborne MAX-DOASRainer VolkamerCU Boulder
CO, CO2, CH4, H2OCavity Enhanced AbsorptionColm SweeneyNOAA GML
NO, NO2, NOy, O3Cavity Ring DownSteve BrownNOAA CSL
Met package (P, T, RH)AIMMS ProbeAlan BrewerNOAA CSL