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We report the first simultaneous in situ observation of a suite of compounds important in nocturnal nitrogen oxide chemistry. Measurements took place at a ground site near Boulder, Colorado, during the fall of 2001. Chemical measurements included NO 3 , N 2 O 5 , NO, NO 2 and O 3 ; meteorological data were also available. The concentrations of NO 3 and N 2 O 5 showed large dynamic ranges that were consistent with variations in NO 2 and NO and with shifts in meteorological conditions at this site. The observed ratio of N 2 O 5 to NO 3 agreed with the ratio calculated from the measured NO 2 concentration and the temperature‐dependent equilibrium constant. In addition, NO 3 and N 2 O 5 showed large short‐term variability that may indicate inhomogeneously mixed source and sink compounds and/or deposition at this ground‐based measurement site. Finally, N 2 O 5 reached a peak concentration of nearly 3 ppbv under polluted conditions and accounted for an appreciable fraction of the total concentration of measured nitrogen oxide species.
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Brown et al. (2003) studied this question.
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