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Description

This dataset provides the concentrations of gas phase organic and inorganic analytes measured by the California Institute of Technology (CIT) Chemical Ionization Mass Spectrometer (CIMS), or CIT-CIMS. The CIT-CIMS employs CF3O-ion chemistry with two independent mass spectrometers (compact time-of-flight and triple quadrupole) to enable sensitive and specific measurements of atmospheric trace gases. The measurements include hydrogen cyanide (HCN), nitric acid (HNO3), methyl hydrogen peroxide (CH3OOH), peroxyacetic acid (C2O3H4), peroxynitric acid (HO2NO2), and sulfur dioxide (SO2), in parts-per-trillion-by-volume (pptv).

Product Summary

Platforms
NASA DC-8
Instruments
CIMS
Projects
ATom
Spatial Extent

N: 80.5222 S: -80.1179 E: 180 W: -180

Location
GLOBAL ,
ATLANTIC OCEAN ,
PACIFIC OCEAN
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
2016-07-29 to 2017-10-28
Data Partner
THE OAK RIDGE NATIONAL LABORATORY (ORNL) DISTRIBUTED ACTIVE ARCHIVE CENTER (DAAC) (ORNL_DAAC)
Concept ID
C4290776515-ORNL_CLOUD
Data State
DEPRECATED
Number of Files/Granules
0
Processing Level
2
Published
Updated
Science Keywords
Air Quality ,
Trace Gases/Trace Species

Citation

Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.

Copy Citation

Allen, H. M., Crounse, J. D., Kim, M. J., Teng, A. P., & Wennberg, P. O. (2019). ATom: L2 In Situ Data from Caltech Chemical Ionization Mass Spectrometer (CIT-CIMS) (Version 1). ORNL Distributed Active Archive Center. https://doi.org/10.3334/ORNLDAAC/1713 Date Accessed: 2026-09-12

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