首页|Vertical mixing of pollutants and secondary inorganic aerosol formations over Beijing, China
Vertical mixing of pollutants and secondary inorganic aerosol formations over Beijing, China
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NETL
NSTL
Elsevier
Vertical mixing of pollutants and secondary inorganic aerosol formations over Beijing, China are investigated based on an unique observational platform on the roof of a high building (528 m above ground) and stations near ground. The contrary trends in diurnal variations of pollutants (SO2, NOx etc.) between the 528 m layer and near ground confirm that pollutants are well mixed in the daytime, but strongly suppressed at night due to the decoupling of the residual layer (RL) and nocturnal stable boundary layer (SBL). The decoupling also results in differences of aerosol formations between the two layers due to the differences in gaseous precursors, atmospheric oxidation capacity, and meteorological variables. Observations indicate that sulfate formation is more efficient near ground than in the 528 m layer due to higher relative humidity (RH) near ground, while nocturnal nitrate formation is more efficient in the 528 m layer due to higher O3 in this layer. The formed nitrate in the RL is downwards transported to ground in next morning, highlighting the potential importance of vertical pollutants mixing and residual layer chemistry in air quality near ground.
NETL
NSTL
Elsevier
