Influences of approaching tropical cyclones on water vapor and aerosols in the atmospheric boundary layer of Guangdong-Hong Kong-Macau Greater Bay Area of China.

Autor: Huang T; Department of Geography and Resource Management, The Chinese University of Hong Kong, 999077, Hong Kong., Li Y; Department of Geography and Resource Management, The Chinese University of Hong Kong, 999077, Hong Kong., Lolli S; CNR-IMAA, Istituto di Metodologie Ambientali, Tito, PZ, Italy; Department of Physics, Kent State University, Florence Campus, 44240 Kent, OH, USA., Cheng JCH; Department of Geography and Resource Management, The Chinese University of Hong Kong, 999077, Hong Kong., Wang J; National Institute of Education, Nanyang Technological University, Singapore., Lam DHY; Hong Kong Observatory, 999077, Hong Kong., Leung WH; Hong Kong Observatory, 999077, Hong Kong., Lee HF; Department of Geography and Resource Management, The Chinese University of Hong Kong, 999077, Hong Kong., Yim SHL; Asian school of the Environment, Nanyang Technological University, Singapore; Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore; Earth Observatory of Singapore, Nanyang Technological University, Singapore. Electronic address: yimsteve@gmail.com.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2023 Jul 01; Vol. 880, pp. 163188. Date of Electronic Publication: 2023 Mar 29.
DOI: 10.1016/j.scitotenv.2023.163188
Abstrakt: The outer circulation of tropical cyclones (TCs) on the western North Pacific has been reported to substantially influence the atmospheric environment over the Guangdong-Hong Kong-Macau Greater Bay Area (GBA) of China, whereas dynamic evolution and redistribution of water vapor and aerosol in the atmospheric boundary layer (ABL) responding to moving TCs have yet to be understood. This study aims to answer three key research questions related to the influences of the approaching TCs: (1) how do water vapor and aerosol particles over the GBA change during the TC approaching stage? (2) how does the ABL in terms of vertical wind structure respond to the approaching TCs? and (3) how does turbulence influence the vertical profile of aerosol during the approaching stage? Based on an intensive analysis of three-year reanalysis and Doppler LiDAR data, this study identified a dry-polluted time over the GBA when a TC was located at ~1000 km away on South China Sea. Before that, horizontal wind has consistently come from the northeast, creating a favorable condition for weak transboundary air pollution to the GBA. During the dry-polluted time, the highest surface PM 2.5 concentration was resulted from the enhanced downdraft and early-stage wind shear, i.e., stronger wind started occurring at upper-level ABL, while the further turbulent mixing induced by wind shear enhancement and updrafts recovery pumped surface pollution upward to the upper level when TCs became closer. Our findings are expected to improve both weather and PM 2.5 forecasts under the impacts of approaching TCs.
Competing Interests: Declaration of competing interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Steve H.L. Yim reports financial support was provided by Dr. Stanley Ho Medical Development Foundation. Steve H.L. Yim reports financial support was provided by Government of Singapore Ministry of Education. Steve H.L. Yim reports financial support was provided by Earth Observatory of Singapore at NTU.
(Copyright © 2023 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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