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Assessing Transboundary‐Local Aerosols Interaction Over Complex Terrain Using a Doppler LiDAR Network
Author(s) -
Huang Tao,
Li Yue,
Cheng Jack C. H.,
Haywood Jim,
Hon K. K.,
Lam David H. Y.,
Lee Olivia S. M.,
Lolli Simone,
O’Connor Ewan James,
Lee Harry F.,
Wang Mengya,
Yim Steve H. L.
Publication year - 2021
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2021gl093238
Subject(s) - lidar , environmental science , orographic lift , aerosol , planetary boundary layer , terrain , air quality index , meteorology , wind shear , atmospheric sciences , wind speed , remote sensing , precipitation , geology , geography , turbulence , cartography
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.