The ORNL DAAC recently released a new version of the following Atmospheric Tomography Mission (ATom) dataset by Veres, P.R., et al. (2021):
ATom: L2 Measurements from NOAA ToF Chemical Ionization Mass Spectrometer, Version 2
This dataset provides the mixing ratios of reactive nitrogen and halogen species measured by the NOAA Iodide Ion Time-of-Flight Chemical Ionization Mass Spectrometer (NOAA CIMS) during airborne campaigns conducted by NASA's Atmospheric Tomography (ATom) mission for ATom-3 and ATom-4 campaigns. ATom utilizes the instruments on the NASA DC-8 aircraft for systematic, global-scale sampling of the atmosphere, profiling continuously from 0.2-13 km altitude. In this version, the calibration method used to determine the instrument sensitivity to C2H4O3S utilizes more accurate actinometry of chlorine radicals, which are used to produce known quantities of C2H4O3S from dimethyl sulfide.
This comprehensive dataset will be used to improve the representation of chemically reactive gases and short-lived climate forcers in global models of atmospheric chemistry and climate.
The Atmospheric Tomography Mission (ATom) is a NASA Earth Venture Suborbital-2 mission to study the impact of human-produced air pollution on greenhouse gases and on chemically reactive gases in the atmosphere. ATom deployed an extensive gas and aerosol payload on the NASA DC-8 aircraft for systematic, global-scale sampling of the atmosphere, profiling continuously from 0.2 to 12 km altitude. Around-the-world flights were conducted in each of four seasons between 2016 and 2018.
Additional data from ATom and other relevant links can be found on the ORNL DAAC's ATom Project Page.
Citation: Veres, P.R., J.A. Neuman, and T.B. Ryerson. 2021. ATom: L2 Measurements from NOAA ToF Chemical Ionization Mass Spectrometer, Version 2. ORNL DAAC, Oak Ridge, Tennessee, USA. https://doi.org/10.3334/ORNLDAAC/1921