Chapter 65
Aerosol Indirect Effect on Air
Pollution-Meteorology Interaction
in an Urban Environment
Wanmin Gong, Ayodeji Akingunola, Shuzhan Ren, Stephen Beagley,
Rodrigo Munoz-Alpizar, Paul Makar and Craig Stroud
Abstract Using a fully coupled air quality prediction model, simulations were
carried out to investigate the impact of aerosol indirect effect on air pollutionmeteorology interaction in an urban environment. We found that the aerosol indirect
effect results in an increase in cloud droplet number concentration, a reduction in
cloud droplet size, and an increase in cloud water. While, as a result, precipitation
production is suppressed in low-level clouds, we found that, in a case of deep convective clouds, there is an enhancement of cloud ice and precipitation production at
higher levels due to the increase in abundance of smaller drops being carried up in
the updraft. There is also an indication of enhanced convective activity due to urban
heating.
W. Gong (B) · A. Akingunola · S. Ren · S. Beagley · P. Makar · C. Stroud
Air Quality Research Division, Science and Technology Branch, Environment and Climate
Change Canada, Toronto, ON, Canada
e-mail: Wanmin.gong@canada.ca
A. Akingunola
e-mail: Ayodeji.akingunola@canada.ca
S. Ren
e-mail: Shuzhan.ren@canada.ca
S. Beagley
e-mail: Stephen.beagley@canada.ca
P. Makar
e-mail: Paul.makar@canada.ca
C. Stroud
e-mail: Craig.stroud@canada.ca
R. Munoz-Alpizar
Air Quality Modelling and Application, Meteorological Service of Canada, Environment and
Climate Change Canada, Dorval, QC, Canada
e-mail: Rodrigo.munoz-alpiza@canada.ca
© Crown 2020
C. Mensink et al. (eds.), Air Pollution Modeling and its Application XXVI,
Springer Proceedings in Complexity, https://doi.org/10.1007/978-3-030-22055-6_65
407
Aerosol Indirect Effect on Air
Pollution-Meteorology Interaction
in an Urban Environment
Wanmin Gong, Ayodeji Akingunola, Shuzhan Ren, Stephen Beagley,
Rodrigo Munoz-Alpizar, Paul Makar and Craig Stroud
Abstract Using a fully coupled air quality prediction model, simulations were
carried out to investigate the impact of aerosol indirect effect on air pollutionmeteorology interaction in an urban environment. We found that the aerosol indirect
effect results in an increase in cloud droplet number concentration, a reduction in
cloud droplet size, and an increase in cloud water. While, as a result, precipitation
production is suppressed in low-level clouds, we found that, in a case of deep convective clouds, there is an enhancement of cloud ice and precipitation production at
higher levels due to the increase in abundance of smaller drops being carried up in
the updraft. There is also an indication of enhanced convective activity due to urban
heating.
W. Gong (B) · A. Akingunola · S. Ren · S. Beagley · P. Makar · C. Stroud
Air Quality Research Division, Science and Technology Branch, Environment and Climate
Change Canada, Toronto, ON, Canada
e-mail: Wanmin.gong@canada.ca
A. Akingunola
e-mail: Ayodeji.akingunola@canada.ca
S. Ren
e-mail: Shuzhan.ren@canada.ca
S. Beagley
e-mail: Stephen.beagley@canada.ca
P. Makar
e-mail: Paul.makar@canada.ca
C. Stroud
e-mail: Craig.stroud@canada.ca
R. Munoz-Alpizar
Air Quality Modelling and Application, Meteorological Service of Canada, Environment and
Climate Change Canada, Dorval, QC, Canada
e-mail: Rodrigo.munoz-alpiza@canada.ca
© Crown 2020
C. Mensink et al. (eds.), Air Pollution Modeling and its Application XXVI,
Springer Proceedings in Complexity, https://doi.org/10.1007/978-3-030-22055-6_65
407