Please use this identifier to cite or link to this item:
Title: An in situ flow tube system for direct measurement of N2O5 heterogeneous uptake coefficients in polluted environments
Authors: Wang, W 
Wang, Z 
Yu, C 
Xia, M 
Peng, X 
Zhou, Y
Yue, D
Ou, Y
Wang, T 
Issue Date: 2018
Publisher: Copernicus Gesellschaft
Source: Atmospheric measurement techniques, 2018, v. 11, no. 10, p. 5643-5655 How to cite?
Journal: Atmospheric measurement techniques 
Abstract: The heterogeneous reactivity of dinitrogen pentoxide (N2O5) on ambient aerosols plays a key role in the atmospheric fate of NOx and formation of secondary pollutants. To better understand the reactive uptake of N2O5 on complex ambient aerosols, an in situ experimental approach to direct measurement of N2O5 uptake coefficient (γN2O5) was developed for application in environments with high, variable ambient precursors. The method utilizes an aerosol flow tube reactor coupled with an iterative chemical box model to derive γN2O5 from the depletion of synthetically generated N2O5 when mixed with ambient aerosols. Laboratory tests and model simulations were performed to characterize the system and the factors affecting γN2O5, including mean residence time, wall loss variability with relative humidity (RH), and N2O5 formation and titration with high levels of NO, NOx, and O3. The overall uncertainty was estimated to be 37%-40% at γN2O5 of 0.03 for RH varying from 20% to 70%. The results indicate that this flow tube coupled with the iterative model method could be buffered to NO concentrations below 8ppbv and against air mass fluctuations switching between aerosol and non-aerosol modes. The system was then deployed in the field to test its applicability under conditions of high ambient NO2 and O3 and fresh NO emission. The results demonstrate that the iterative model improved the accuracy of γN2O5 calculations in polluted environments and thus support the further field deployment of the system to study the impacts of heterogeneous N2O5 reactivity on photochemistry and aerosol formation.
ISSN: 1867-1381
EISSN: 1867-8548
DOI: 10.5194/amt-11-5643-2018
Rights: © Author(s) 2018. This work is distributed under the Creative Commons Attribution 4.0 License.
The following publication: Wang, W., Wang, Z., Yu, C., Xia, M., Peng, X., Zhou, Y., Yue, D., Ou, Y., and Wang, T.: An in situ flow tube system for direct measurement of N2O5 heterogeneous uptake coefficients in polluted environments, Atmos. Meas. Tech., 11, 5643-5655 is available at, 2018.
Appears in Collections:Journal/Magazine Article

Files in This Item:
File Description SizeFormat 
Wang_in situ_ flow_tube.pdf9.78 MBAdobe PDFView/Open
View full-text via PolyU eLinks SFX Query
Show full item record
PIRA download icon_1.1View/Download Contents

Page view(s)

Citations as of Mar 12, 2019

Google ScholarTM



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.