Synonyms: 
Atmospheric Tomography Mission
Associated content: 
ATom
Sub-categories: 
ATOM 2, ATom 3, ATOM 4, ATom Data Sets, ATom I

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: 
CIMS
Measurements: 
HCOOH, ClNO2, N2O5, BrO, Cl2, BrCN, BrCl, C2H4O3S
Aircraft: 
DC-8 - AFRC
Point(s) of Contact: 
J. Andy Neuman (PI)

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

Hodshire, A., et al. (2019), The potential role of methanesulfonic acid (MSA) in aerosol formation and growth and the associated radiative forcings, Atmos. Chem. Phys., 19, 3137-3160, doi:10.5194/acp-19-3137-2019.

Strong impact of wildfires on the abundance and aging of black carbon in the lowermost stratosphere

Ditas, J., et al. (2018), Strong impact of wildfires on the abundance and aging of black carbon in the lowermost stratosphere, Proc. Natl. Acad. Sci., 811595-11603, doi:10.1073/pnas.1806868115.

Mapping hydroxyl variability throughout the global remote troposphere via synthesis of airborne and satellite formaldehyde observations

Wolfe, G. M., et al. (2019), Mapping hydroxyl variability throughout the global remote troposphere via synthesis of airborne and satellite formaldehyde observations, Proc. Natl. Acad. Sci., doi:10.1073/pnas.1821661116.

The distribution of sea-salt aerosol in the global troposphere

Murphy, D., et al. (2019), The distribution of sea-salt aerosol in the global troposphere, Atmos. Chem. Phys., 19, 4093-4104, doi:10.5194/acp-19-4093-2019.

Methyl, Ethyl, and Propyl Nitrates: Global Distribution and Impacts on Reactive Nitrogen in Remote Marine Environments

Fisher, J. A., et al. (2018), Methyl, Ethyl, and Propyl Nitrates: Global Distribution and Impacts on Reactive Nitrogen in Remote Marine Environments, J. Geophys. Res., 123, 12,429-12,451, doi:10.1029/2018JD029046.

Short Black Carbon lifetime inferred from a global set of aircraft observations

Lund, M. T., et al. (2019), Short Black Carbon lifetime inferred from a global set of aircraft observations, Nature Clim Atmos Sci, doi:10.1038/s41612-018-0040-x.

Strong Contrast in Remote Black Carbon Aerosol Loadings Between the Atlantic and Pacific Basins

Katich, J., et al. (2018), Strong Contrast in Remote Black Carbon Aerosol Loadings Between the Atlantic and Pacific Basins, J. Geophys. Res., 123, 13,386-13,395, doi:10.1029/2018JD029206.

Efficient In‐Cloud Removal of Aerosols by Deep Convection

Yu, P., et al. (2019), Efficient In‐Cloud Removal of Aerosols by Deep Convection, Geophys. Res. Lett., 46, 1061-1069, doi:10.1029/2018GL080544.

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