Articles | Volume 22, issue 16
Research article
22 Aug 2022
Research article |  | 22 Aug 2022

Impact of urban heat island on inorganic aerosol in the lower free troposphere: a case study in Hangzhou, China

Hanqing Kang, Bin Zhu, Gerrit de Leeuw, Bu Yu, Ronald J. van der A, and Wen Lu

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Cited articles

Aan de Brugh, J. M. J., Henzing, J. S., Schaap, M., Morgan, W. T., van Heerwaarden, C. C., Weijers, E. P., Coe, H., and Krol, M. C.: Modelling the partitioning of ammonium nitrate in the convective boundary layer, Atmos. Chem. Phys., 12, 3005–3023,, 2012. 
Baik, J. J., Kim, Y. H., Kim, J. J., and Han, J. Y.: Effects of boundary-layer stability on urban heat island-induced circulation, Theor. Appl. Climatol., 89, 73–81,, 2006. 
Changnon, S. A.: Rainfall Changes in Summer Caused by St. Louis, Science, 205, 402–404,, 1979. 
Crutzen, P.: New Directions: The growing urban heat and pollution “island” effect – impact on chemistry and climate, Atmos. Environ., 38, 3539–3540,, 2004. 
Curci, G., Ferrero, L., Tuccella, P., Barnaba, F., Angelini, F., Bolzacchini, E., Carbone, C., Denier van der Gon, H. A. C., Facchini, M. C., Gobbi, G. P., Kuenen, J. P. P., Landi, T. C., Perrino, C., Perrone, M. G., Sangiorgi, G., and Stocchi, P.: How much is particulate matter near the ground influenced by upper-level processes within and above the PBL? A summertime case study in Milan (Italy) evidences the distinctive role of nitrate, Atmos. Chem. Phys., 15, 2629–2649,, 2015. 
Short summary
This study quantified the contribution of each urban-induced meteorological effect (temperature, humidity, and circulation) to aerosol concentration. We found that the urban heat island (UHI) circulation dominates the UHI effects on aerosol. The UHI circulation transports aerosol and its precursor gases from the warmer lower boundary layer to the colder lower free troposphere and promotes the secondary formation of ammonium nitrate aerosol in the cold atmosphere.
Final-revised paper