V. A. Velazco, et al.
Validation of the Atmospheric Chemistry Experiment by noncoincident MkIV balloon profiles
Journal of Geophysical Research: Atmospheres, 116(6), D06306, 2011; doi: 10.1029/2010JD014928
O3 18OO2 O18OO O17OO H2O H218O H217O HDO CH4 13CH4 CH3D N2O 15NNO N15NO N218O N217O HNO3 HCl HF CO 13CO C17O C18O CCl3F CCl2F2 ClONO2 HCN COF2 CF4 CH3Cl SF6 OCS CHClF2 O13CS OC34S DMPs


[1] We have compared volume mixing ratio profiles of atmospheric trace gases measured by the Atmospheric Chemistry Experiment (ACE) version 2.2 and the MkIV solar occultation Fourier transform infrared spectrometers. These gases are H2O, O3, N2O, CO, CH4, HNO3, HF, HCl, OCS, ClONO2, HCN, CH3Cl, CF4, CCl2F2, CCl3F, COF2, CHF2Cl, and SF6. Due to the complete lack of close spatiotemporal coincidences between the ACE occultations and the MkIV balloon flights, we used potential temperatures and equivalent latitudes from analyzed meteorological fields to find comparable ACE and MkIV profiles. The results show excellent agreement for CH4, N2O, and other long-lived gases but slightly poorer agreement for shorter-lived species like CO, O3, and HCN. For example, in the upper troposphere (∼400–650 K), maximum differences between MkIV and ACE are 2.4% for CH4, 1.7% for N2O, −12.4% for CO, −15.9% for O3, and −5.6% for HCN. In the lower stratosphere (∼650–900 K), maximum MkIV-ACE differences are 7.6% for CH4, 14.1% for N2O, 7.3% for CO, −9.2% for O3, and 31.5% for HCN. Apart from a small vertical misregistration problem, the overall agreement between MkIV and ACE is very good.


  author = "V. A. Velazco and G. C. Toon and J.-F. L. Blavier and A. Kleinböhl and G. L. Manney and W. H. Daffer and P. F. Bernath and K. A. Walker and C. Boone",
  title = "Validation of the Atmospheric Chemistry Experiment by noncoincident MkIV balloon profiles",
  year = 2011,
  journal = "Journal of Geophysical Research: Atmospheres",
  volume = 116,
  number = 6,
  pages = "D06306",
  month = "Mar",
  keywords = "O3, 18OO2, O18OO, O17OO, H2O, H218O, H217O, HDO, CH4, 13CH4, CH3D, N2O, 15NNO, N15NO, N218O, N217O, HNO3, HCl, HF, CO, 13CO, C17O, C18O, CCl3F, CCl2F2, ClONO2, HCN, COF2, CF4, CH3Cl, SF6, OCS, CHClF2, O13CS, OC34S, DMPs",
  doi = "10.1029/2010JD014928",
  url = ""
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