Investigating the interaction between transboundary haze and planetary boundary layer in Singapore
Transboundary air pollution is one of the critical environmental problems in Southeast Asia; nevertheless the interaction between transboundary haze and local planetary boundary layer (PBL) remains unclear due to a lack of sufficient observations and sophisticated simulations. This study applied LiD...
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
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2024
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| Online Access: | https://hdl.handle.net/10356/179823 |
| _version_ | 1826128129552285696 |
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| author | Huang, Tao Fang, Tingting Feng, Lujia Leong, C. Y. Yim, Steve Hung Lam |
| author2 | Asian School of the Environment |
| author_facet | Asian School of the Environment Huang, Tao Fang, Tingting Feng, Lujia Leong, C. Y. Yim, Steve Hung Lam |
| author_sort | Huang, Tao |
| collection | NTU |
| description | Transboundary air pollution is one of the critical environmental problems in Southeast Asia; nevertheless the interaction between transboundary haze and local planetary boundary layer (PBL) remains unclear due to a lack of sufficient observations and sophisticated simulations. This study applied LiDAR observations and model simulations to comprehensively evaluate the interaction between transboundary haze and local PBL during a recent transboundary haze episode in Singapore in October 2023. Results show that upper-level southeasterly wind, especially the nocturnal low-level jet, created favorable conditions for aerosol transport when fire hotspot numbers increased in Indonesia. The rapid diurnal increase in PBL height facilitated the entrainment of upper-level haze into the PBL, interacting with ground-level aerosols through turbulent mixing. Model simulations further show the significant contributions of fire emissions to the transboundary haze episode in maritime Southeast Asia. The impacts extended toward the southern region of Peninsular Malaysia, driven by the persistent prevailing southeasterly wind. |
| first_indexed | 2024-10-01T07:19:53Z |
| format | Journal Article |
| id | ntu-10356/179823 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:19:53Z |
| publishDate | 2024 |
| record_format | dspace |
| spelling | ntu-10356/1798232024-08-26T15:30:44Z Investigating the interaction between transboundary haze and planetary boundary layer in Singapore Huang, Tao Fang, Tingting Feng, Lujia Leong, C. Y. Yim, Steve Hung Lam Asian School of the Environment Lee Kong Chian School of Medicine (LKCMedicine) Earth Observatory of Singapore Earth and Environmental Sciences Planetary boundary layer Transboundary haze Transboundary air pollution is one of the critical environmental problems in Southeast Asia; nevertheless the interaction between transboundary haze and local planetary boundary layer (PBL) remains unclear due to a lack of sufficient observations and sophisticated simulations. This study applied LiDAR observations and model simulations to comprehensively evaluate the interaction between transboundary haze and local PBL during a recent transboundary haze episode in Singapore in October 2023. Results show that upper-level southeasterly wind, especially the nocturnal low-level jet, created favorable conditions for aerosol transport when fire hotspot numbers increased in Indonesia. The rapid diurnal increase in PBL height facilitated the entrainment of upper-level haze into the PBL, interacting with ground-level aerosols through turbulent mixing. Model simulations further show the significant contributions of fire emissions to the transboundary haze episode in maritime Southeast Asia. The impacts extended toward the southern region of Peninsular Malaysia, driven by the persistent prevailing southeasterly wind. Ministry of Education (MOE) Nanyang Technological University National Environmental Agency (NEA) National Research Foundation (NRF) Published version This research is jointly supported by the Ministry of Education, Singapore, under its MOE AcRF Tier 3 Award MOET32022‐0006, the Start‐up Grant (021452‐00001) (LKC) and Start‐up Grant (021384‐00001) for Assoc. Prof. Yim (ASE), EOS FY2022 funding, the National Research Foundation, Singapore, and National Environment Agency under its Air Quality Monitoring and Control Funding Initiative (AQMC‐2023‐1D‐01). Any opinions, findings and conclusions or recommendations expressed in this material are those of the author(s) and do not reflect the views of National Research Foundation, Singapore and National Environment Agency. 2024-08-26T08:25:17Z 2024-08-26T08:25:17Z 2024 Journal Article Huang, T., Fang, T., Feng, L., Leong, C. Y. & Yim, S. H. L. (2024). Investigating the interaction between transboundary haze and planetary boundary layer in Singapore. Geophysical Research Letters, 51(8), 107667-. https://dx.doi.org/10.1029/2023GL107667 0094-8276 https://hdl.handle.net/10356/179823 10.1029/2023GL107667 2-s2.0-85190625538 8 51 107667 en MOET32022-0006 021452-00001 021384-00001 AQMC‐2023‐1D‐01 Geophysical Research Letters © 2024 The Authors. This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial‐NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made. application/pdf |
| spellingShingle | Earth and Environmental Sciences Planetary boundary layer Transboundary haze Huang, Tao Fang, Tingting Feng, Lujia Leong, C. Y. Yim, Steve Hung Lam Investigating the interaction between transboundary haze and planetary boundary layer in Singapore |
| title | Investigating the interaction between transboundary haze and planetary boundary layer in Singapore |
| title_full | Investigating the interaction between transboundary haze and planetary boundary layer in Singapore |
| title_fullStr | Investigating the interaction between transboundary haze and planetary boundary layer in Singapore |
| title_full_unstemmed | Investigating the interaction between transboundary haze and planetary boundary layer in Singapore |
| title_short | Investigating the interaction between transboundary haze and planetary boundary layer in Singapore |
| title_sort | investigating the interaction between transboundary haze and planetary boundary layer in singapore |
| topic | Earth and Environmental Sciences Planetary boundary layer Transboundary haze |
| url | https://hdl.handle.net/10356/179823 |
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