Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 48, Issue 12, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2021GL093238
Keywords
aerosol; Doppler LiDAR; transboundary air pollution
Categories
Funding
- Dr. Stanley Ho Medicine Development Foundation [8305509]
- Chinese University of Hong Kong [4930744]
- CUHK
- UoE
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A year-long intensive observation of the atmospheric boundary layer (ABL) at multiple sites in Hong Kong using a four-Doppler Light Detection and Ranging (LiDAR) network with different scanning modes revealed the heterogeneity of the ABL induced by orographic topography, as well as the interaction between local and advected aerosol layers during a transboundary air pollution (TAP) episode.
Transboundary-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.
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