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
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 at...
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sg-ntu-dr.10356-1720692023-11-21T04:30:33Z 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 Huang, Tao Li, Yue Lolli, Simone Cheng, Jack Chin Ho Wang, Junting Lam, David Hok Yin Leung, W. H. Lee, Harry F. Yim, Steve Hung Lam Asian School of the Environment Lee Kong Chian School of Medicine (LKCMedicine) National Institute of Education Earth Observatory of Singapore Social sciences::Geography::Environmental sciences Aerosol Water Vapor 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 PM2.5 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 PM2.5 forecasts under the impacts of approaching TCs. Ministry of Education (MOE) Nanyang Technological University The authors would like to thank for the following grants for their supports on this research: Dr. Stanley Ho Medical Development Foundation (grant no. 8305509), Start-up Grant from NTU (SUG: 021384-00001) and Ministry of Education of Singapore (MOE SUG: 021452-00001), MOE AcRF Tier 1 from Ministry of Education of Singapore (RG126/21: 021591- 00001), and EOS FY2022 funding (EOS MOE RCE FY 2022: 021943- 0001) from Earth Observatory of Singapore at NTU. 2023-11-21T04:30:32Z 2023-11-21T04:30:32Z 2023 Journal Article Huang, T., Li, Y., Lolli, S., Cheng, J. C. H., Wang, J., Lam, D. H. Y., Leung, W. H., Lee, H. F. & Yim, S. H. L. (2023). 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. Science of the Total Environment, 880, 163188-. https://dx.doi.org/10.1016/j.scitotenv.2023.163188 0048-9697 https://hdl.handle.net/10356/172069 10.1016/j.scitotenv.2023.163188 37001679 2-s2.0-85152134146 880 163188 en SUG: 021384-00001 MOE SUG: 021452-00001 RG126/21: 021591- 00001 EOS MOE RCE FY 2022: 021943- 0001 Science of the Total Environment © 2023 Elsevier B.V. All rights reserved. |
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Social sciences::Geography::Environmental sciences Aerosol Water Vapor Huang, Tao Li, Yue Lolli, Simone Cheng, Jack Chin Ho Wang, Junting Lam, David Hok Yin Leung, W. H. Lee, Harry F. Yim, Steve Hung Lam 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 |
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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 PM2.5 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 PM2.5 forecasts under the impacts of approaching TCs. |
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Asian School of the Environment |
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Asian School of the Environment Huang, Tao Li, Yue Lolli, Simone Cheng, Jack Chin Ho Wang, Junting Lam, David Hok Yin Leung, W. H. Lee, Harry F. Yim, Steve Hung Lam |
format |
Article |
author |
Huang, Tao Li, Yue Lolli, Simone Cheng, Jack Chin Ho Wang, Junting Lam, David Hok Yin Leung, W. H. Lee, Harry F. Yim, Steve Hung Lam |
author_sort |
Huang, Tao |
title |
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 |
title_short |
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 |
title_full |
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 |
title_fullStr |
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 |
title_full_unstemmed |
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 |
title_sort |
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 |
publishDate |
2023 |
url |
https://hdl.handle.net/10356/172069 |
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1783955597762232320 |