Associated content: 

Atmospheric Acetaldehyde: Importance of Air‐Sea Exchange and a Missing Source in the Remote Troposphere

NOAA Iodide Ion Time-of-Flight Chemical Ionization Mass Spectrometer

Iodide Ion ToF (Time-of-Flight) CIMS (Chemical Ionization Mass Spectrometer)

Principle of the Measurement

Chemical ionization mass spectrometric detection of gas phase organic and inorganic analytes via I- adduct formation

Species Measured

Reactive nitrogen species: HNO3 (nitric acid), HONO (nitrous acid), HO2NO2 (peroxynitric acid), N2O5 (dinitrogen pentoxide), HNCO (isocyanic acid) 
Halogen Species: ClNO2, HCl, HBr, HOBr, HOCl, Cl2, Br2 
Low to intermediate volatility organic species

Time Response

Instrumental response <1 sec, Field response is limited by inlet surface affinity for a particular species

Detection Limit

Precision on 1s data various by species

Accuracy

(15% + 1 pptv) for N2O5
(20% + 1 pptv) for ClNO2
(30% + 15 pptv) for HONO
(25% + 10 pptv) for HO2NO2
(15% + 15 pptv) for HNO3
(20% + 5 pptv) for HNCO
(20% + 15 pptv) for HCOOH
(30% + 1 pptv) for halogenated species

Manufacturer

TOFWERK/Aerodyne Research Inc. (modified)

Instrument Type: 
Measurements: 
Aircraft: 
Instrument Team: 

The potential role of methanesulfonic acid (MSA) in aerosol formation and growth and the associated radiative forcings

Atom: Global Modeled and CAFS Measured Cloudy and Clear Sky Photolysis Rates, 2016. ORNL DAAC, Oak Ridge, Tennessee

Observationally constrained analysis of sea salt aerosol in the marine atmosphere 3

Bian, H., et al. (2019), Observationally constrained analysis of sea salt aerosol in the marine atmosphere 3, Atmos. Chem. Phys., doi:10.5194/acp-2019-18.

An evaluation of global organic aerosol schemes using airborne observations

Pai, S. J., et al. (2019), An evaluation of global organic aerosol schemes using airborne observations, Atmos. Chem. Phys., doi:10.5194/acp-2019-331.

CAFE: a new, improved non-resonant laser-induced fluorescence instrument for airborne in situ measurement of formaldehyde

Flow-induced errors in airborne in-situ measurements of aerosols and clouds

Spanu, A., et al. (2019), Flow-induced errors in airborne in-situ measurements of aerosols and clouds, Atmos. Meas. Tech., 2019, doi:10.5194/amt-2019-27.

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