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• W2016039375 abstract "During the 1997 Photochemistry of Ozone Loss in the Arctic Region in Summer (POLARIS) mission, simultaneous in situ observations of NOx and HOx radicals, their precursors, and the radiation field were obtained in the lower stratosphere. We use these observations to evaluate the primary mechanisms that control NOx−HNO3 exchange and to understand their control over the partitioning between NO2 and HNO3 in regions of continuous sunlight. We calculate NOx production (PNOx) and loss (LNOx) in a manner directly constrained by the in situ measurements and current rate constant recommendations, using approaches for representing albedo, overhead O3 and [OH] that reduce model uncertainty. We find a consistent discrepancy of 18% between modeled rates of NOx production and loss (LNOx = 1.18PNOx) which is within the measurement uncertainty of ±27%. The partitioning between NOx production processes is [HNO3 + OH (41 ± 2)%; HNO3 + hν (59 ± 2)%] and between NOx loss processes is [NO2 + OH, 90% to >97%; BrONO2 + H2O, 10% to <3%]. The steady-state description of NOx−HNO3 exchange reveals the significant influence of the tight correlation between the photolysis rate of HNO3 and [OH] established by in situ measurements throughout the lower stratosphere. Parametrizing this relationship, we find (1) the steady-state value of [NO2]24h-avg/[HNO3] in the continuously sunlit, lower stratosphere is a function only of temperature and number density, and (2) the partitioning of NOx production between HNO3 + OH and HNO3 + hν is nearly constant throughout most of the lower stratosphere. We describe a methodology (functions of latitude, day, temperature, and pressure) for accurately predicting the steady-state value of [NO2]24h-avg/[HNO3] and the partitioning of NOx production within these regions. The results establish a metric to compare observations of [NO2]24h-avg/[HNO3] within the continuously sunlit region and provide a simple diagnostic for evaluating the accuracy of models that attempt to describe the coupled NOx−HOx photochemistry in the lower stratosphere." @default.
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• W2016039375 date "2001-01-05" @default.
• W2016039375 modified "2023-10-14" @default.
• W2016039375 title "The NO<i>_x</i>−HNO₃System in the Lower Stratosphere: Insights from In Situ Measurements and Implications of the<i>J</i>_HNO_₃−[OH] Relationship" @default.
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• W2016039375 doi "https://doi.org/10.1021/jp002519n" @default.
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