In:
Atmospheric Chemistry and Physics, Copernicus GmbH, Vol. 20, No. 7 ( 2020-04-15), p. 4367-4378
Abstract:
Abstract. Heterogeneous reactivity of N2O5 on aerosols is
a critical parameter in assessing NOx fate, nitrate production, and
particulate chloride activation. Accurate measurement of its uptake
coefficient (γN2O5) and representation in air quality models
are challenging, especially in the polluted environment. With an in situ
aerosol flow-tube system, the γN2O5 was directly measured on
ambient aerosols at two rural sites in northern and southern China. The
results were analyzed together with the γN2O5 derived from
previous field studies in China to obtain a holistic picture of
N2O5 uptake and the influencing factors under various climatic and
chemical conditions. The field-derived or measured γN2O5 was
generally promoted by the aerosol water content and suppressed by particle
nitrate. Significant discrepancies were found between the measured γN2O5 and that estimated from laboratory-determined parameterizations.
An observation-based empirical parameterization was derived in the present
work, which better reproduced the mean value and variability of the observed
γN2O5. Incorporating this new parameterization into a regional
air quality model (WRF-CMAQ) has improved the simulation of N2O5,
nitrogen oxides, and secondary nitrate in the polluted regions of China.
Type of Medium:
Online Resource
ISSN:
1680-7324
DOI:
10.5194/acp-20-4367-2020
DOI:
10.5194/acp-20-4367-2020-supplement
Language:
English
Publisher:
Copernicus GmbH
Publication Date:
2020
detail.hit.zdb_id:
2092549-9
detail.hit.zdb_id:
2069847-1
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