Estimation of night-time N2O5 concentrations from ambient NO2 and NO3 radical concentrations and the role of N2O5 in night-time chemistry |
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| Institution: | 1. Institute for Biodiversity and Ecosystem Dynamics (IBED), Universiteit van Amsterdam, The Netherlands;2. De GISFabriek, Rotterdam, The Netherlands;1. Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;2. Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China;3. University of Chinese Academy of Sciences, Beijing 100049, China;4. Shenyang Academy of Environmental Sciences, Shenyang 110167, China;5. Shenyang Environmental Monitoring Centre, Shenyang 110000, China;6. Chinese Research Academy of Environmental Sciences, Beijing 100012, China;1. Department of Atmospheric Sciences, Pusan National University, Busan 609-735, Republic of Korea;2. Air Quality Forecasting Center, Climate and Air Quality Research Department, National Institute of Environmental Research, Incheon 22689, Republic of Korea |
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| Abstract: | Dinitrogen pentoxide (N2O5), which is present in equilibrium with NO3 radicals and NO2, has been recognized for some time as an intermediate in the NOx chemistry of night-time atmospheres. However, until the advent of long pathlength spectroscopic techniques for the measurement of atmospheric NO3 radical concentrations, no reliable method for estimating N2O5 concentrations has been available. We have calculated maximum night-time N2O5 concentrations from the available experimentally determined concentrations of the NO3 radical and NO2 in the U.S. and Germany, and find that N2O5 concentrations as high as ~ 15 ppb can occur. We have also estimated removal rates for N2O5 and for NO3 radicals during these nights. From data obtained under conditions devoid of point sources of NOx, upper limit estimates of the homogeneous rate constant for the reaction of N2O5 with water vapor are obtained, leading to the conclusion that the homogeneous gas phase rate constant for this reaction is ⩽ 1 × 10−21 cm3 molecule−1 s−1 at 298 K, consistent with recent environmental chamber data. |
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