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Measurements of CH3O2NO2 in the upper troposphere

  • Author(s): Nault, BA
  • Garland, C
  • Pusede, SE
  • Wooldridge, PJ
  • Ullmann, K
  • Hall, SR
  • Cohen, RC
  • et al.

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Methyl peroxy nitrate (CH O NO ) is a non-acyl peroxy nitrate that is important for photochemistry at low temperatures characteristic of the upper troposphere. We report the first measurements of CH O NO , which we achieved through a new aircraft inlet configuration, combined with thermal-dissociation laser-induced fluorescence (TD-LIF) detection of NO , and describe the accuracy, specificity, and interferences to CH O NO measurements. CH O NO is predicted to be a ubiquitous interference to upper-tropospheric NO measurements. We describe an experimental strategy for obtaining NO observations free of the CH O NO interference. Using these new methods, we made observations during two recent aircraft campaigns: the Deep Convective Clouds and Chemistry (DC-3) and the Studies of Emissions and Atmospheric Composition, Clouds, and Climate Coupling by Regional Surveys (SEAC4RS) experiments. The CH O NO measurements we report have a detection limit (S/N = 2) of 15 pptv at 1 min averaging on a background of 200 pptv NO and an accuracy of ±40%. Observations are used to constrain the interference of pernitric acid (HO NO ) to the CH O NO measurements, as HO NO partially decomposes (∼11%) along with CH O NO in the heated CH O NO channel used to detect CH O NO . 3 2 2 3 2 2 2 3 2 2 3 2 2 2 2 3 2 2 3 2 2 2 2 2 3 2 2 2 2 3 2 2 3 2 2 3 2 2

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