Assessing Transboundary-local Aerosols Interaction over Complex Terrain Using a Doppler LiDAR Network
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AbstractTransboundary-local aerosols interaction requires to be comprehensively understood in urban air quality research. A year-long intensive observation of the atmospheric boundary layer (ABL) at multiple sites in Hong Kong was conducted using a four-Doppler Light Detection and Ranging (LiDAR) network with different scanning modes. Results show that heterogeneity of the ABL in terms of mixing layer height and wind shear was induced by orographic topography. Interaction between local and advected aerosol layers during a transboundary air pollution (TAP) episode was identified by the network. During TAP episode, downward transport of transboundary aerosol relied on small scale eddies with weak wind speed in nighttime, while the transport of surface local aerosol to upper level was the dominated process in daytime, but the heterogeneity of the ABL affected by terrain determined the capacity of the mixing, eventually resulting in the opposite transport direction of aerosols in the transboundary-local aerosols interaction.
Acceptance Date20/05/2021
All Author(s) ListTao Huang, Yue Li, Jack C.H. Cheng, Jim Haywood, K.K. Hon, David H.Y. Lam, Olivia S.M. Lee, Simone Lolli, Ewan James O’Connor, Harry F. Lee, Mengya Wang, Steve H.L. Yim
Journal nameGeophysical Research Letters
Volume Number48
Issue Number12
PublisherAmerican Geophysical Union
Article numbere2021GL093238
LanguagesEnglish-United States
KeywordsLiDAR, Transboundary aerosol, Turbulence

Last updated on 2024-09-04 at 00:27