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Impacts of open biomass burning in Southeast Asia on atmospheric PM2.5 concentrations over south China from 2009 to 2018
https://orcid.org/0000-0003-2457-5821
https://orcid.org/0000-0003-0716-2531
https://orcid.org/0000-0002-5623-1225
https://orcid.org/0000-0003-3733-0313
Abstract Open biomass burning (BB) frequently occurs in spring over Southeast Asia (SEA). The concentration of fine particulate (PM2.5) produced by BB and its impacts on air quality in downwind aeras exhibit significant interannual variations, which are controlled by emission intensity and meteorological circulation. In this study, a regional air quality model system (RAQMS) was applied to investigate the contributions of BB emissions in SEA to atmospheric PM2.5 concentrations over South China in March (a spring month) during 2009–2018 and their interannual variations. Higher near-surface BB-PM2.5 (refers to the PM2.5 produced by BB in SEA) concentrations and contributions were mainly distributed in the source region and its vicinity, while the higher tropospheric BB-PM2.5 concentrations and contributions were characterized by a long belt extending from BB source regions to Yangtze River Delta (YRD) in South China. Combined with the vertical distribution of BB-PM2.5 on the transported path profile, it indicated that higher BB-PM2.5 concentrations were mainly concentrated in 0∼1500 m above the ground over source regions, while the maximum BB-PM2.5 concentrations in the downwind area were distributed in 1500∼3500 m above the ground. The monthly mean tropospheric BB-PM2.5 concentrations were higher in March 2009, 2010, 2012, and 2013, with evident correlation with interannual variation of BB emissions. Sensitivity experiments suggested that the near-surface and tropospheric BB-PM2.5 concentrations over South China had changed by-48.1%∼190.5% and −48.0%∼213.8%, respectively in March 2009–2018 by fixing BB emissions unchanged at the mean of the 10 years, being greater than the changes caused by meteorological conditions and other affecting factors (∼20%). In addition, the relative contributions of BB emission from various regions in SEA on the mean near-surface and tropospheric BB-PM2.5 concentrations over South China were further identified.
Graphical abstract The spatial distribution for monthly mean tropospheric BB-PM2.5 concentrations (fill color, mg m−2) and contributions (grey contour, %) of BB-PM2.5 to total tropospheric PM2.5 concentrations in March of 2009–2018. Display Omitted
Highlights Interannual variation of the impacts of BB on PM2.5 in South China was investigated. Contributions of BB in Southeast Asia to PM2.5 over South China are quantified. Dominant factors affecting the transboundary transport are explored. BB in west Myanmar had a dominant contribution to tropospheric PM2.5 in South China.
Impacts of open biomass burning in Southeast Asia on atmospheric PM2.5 concentrations over south China from 2009 to 2018
https://orcid.org/0000-0003-2457-5821
https://orcid.org/0000-0003-0716-2531
https://orcid.org/0000-0002-5623-1225
https://orcid.org/0000-0003-3733-0313
Abstract Open biomass burning (BB) frequently occurs in spring over Southeast Asia (SEA). The concentration of fine particulate (PM2.5) produced by BB and its impacts on air quality in downwind aeras exhibit significant interannual variations, which are controlled by emission intensity and meteorological circulation. In this study, a regional air quality model system (RAQMS) was applied to investigate the contributions of BB emissions in SEA to atmospheric PM2.5 concentrations over South China in March (a spring month) during 2009–2018 and their interannual variations. Higher near-surface BB-PM2.5 (refers to the PM2.5 produced by BB in SEA) concentrations and contributions were mainly distributed in the source region and its vicinity, while the higher tropospheric BB-PM2.5 concentrations and contributions were characterized by a long belt extending from BB source regions to Yangtze River Delta (YRD) in South China. Combined with the vertical distribution of BB-PM2.5 on the transported path profile, it indicated that higher BB-PM2.5 concentrations were mainly concentrated in 0∼1500 m above the ground over source regions, while the maximum BB-PM2.5 concentrations in the downwind area were distributed in 1500∼3500 m above the ground. The monthly mean tropospheric BB-PM2.5 concentrations were higher in March 2009, 2010, 2012, and 2013, with evident correlation with interannual variation of BB emissions. Sensitivity experiments suggested that the near-surface and tropospheric BB-PM2.5 concentrations over South China had changed by-48.1%∼190.5% and −48.0%∼213.8%, respectively in March 2009–2018 by fixing BB emissions unchanged at the mean of the 10 years, being greater than the changes caused by meteorological conditions and other affecting factors (∼20%). In addition, the relative contributions of BB emission from various regions in SEA on the mean near-surface and tropospheric BB-PM2.5 concentrations over South China were further identified.
Graphical abstract The spatial distribution for monthly mean tropospheric BB-PM2.5 concentrations (fill color, mg m−2) and contributions (grey contour, %) of BB-PM2.5 to total tropospheric PM2.5 concentrations in March of 2009–2018. Display Omitted
Highlights Interannual variation of the impacts of BB on PM2.5 in South China was investigated. Contributions of BB in Southeast Asia to PM2.5 over South China are quantified. Dominant factors affecting the transboundary transport are explored. BB in west Myanmar had a dominant contribution to tropospheric PM2.5 in South China.
Impacts of open biomass burning in Southeast Asia on atmospheric PM2.5 concentrations over south China from 2009 to 2018
https://orcid.org/0000-0003-2457-5821
https://orcid.org/0000-0003-0716-2531
https://orcid.org/0000-0002-5623-1225
https://orcid.org/0000-0003-3733-0313
Abstract Open biomass burning (BB) frequently occurs in spring over Southeast Asia (SEA). The concentration of fine particulate (PM2.5) produced by BB and its impacts on air quality in downwind aeras exhibit significant interannual variations, which are controlled by emission intensity and meteorological circulation. In this study, a regional air quality model system (RAQMS) was applied to investigate the contributions of BB emissions in SEA to atmospheric PM2.5 concentrations over South China in March (a spring month) during 2009–2018 and their interannual variations. Higher near-surface BB-PM2.5 (refers to the PM2.5 produced by BB in SEA) concentrations and contributions were mainly distributed in the source region and its vicinity, while the higher tropospheric BB-PM2.5 concentrations and contributions were characterized by a long belt extending from BB source regions to Yangtze River Delta (YRD) in South China. Combined with the vertical distribution of BB-PM2.5 on the transported path profile, it indicated that higher BB-PM2.5 concentrations were mainly concentrated in 0∼1500 m above the ground over source regions, while the maximum BB-PM2.5 concentrations in the downwind area were distributed in 1500∼3500 m above the ground. The monthly mean tropospheric BB-PM2.5 concentrations were higher in March 2009, 2010, 2012, and 2013, with evident correlation with interannual variation of BB emissions. Sensitivity experiments suggested that the near-surface and tropospheric BB-PM2.5 concentrations over South China had changed by-48.1%∼190.5% and −48.0%∼213.8%, respectively in March 2009–2018 by fixing BB emissions unchanged at the mean of the 10 years, being greater than the changes caused by meteorological conditions and other affecting factors (∼20%). In addition, the relative contributions of BB emission from various regions in SEA on the mean near-surface and tropospheric BB-PM2.5 concentrations over South China were further identified.
Graphical abstract The spatial distribution for monthly mean tropospheric BB-PM2.5 concentrations (fill color, mg m−2) and contributions (grey contour, %) of BB-PM2.5 to total tropospheric PM2.5 concentrations in March of 2009–2018. Display Omitted
Highlights Interannual variation of the impacts of BB on PM2.5 in South China was investigated. Contributions of BB in Southeast Asia to PM2.5 over South China are quantified. Dominant factors affecting the transboundary transport are explored. BB in west Myanmar had a dominant contribution to tropospheric PM2.5 in South China.
Impacts of open biomass burning in Southeast Asia on atmospheric PM2.5 concentrations over south China from 2009 to 2018
Li, Jie (author) / Fan, Wenxuan (author) / Wu, Jian (author) / Han, Zhiwei (author) / Li, Jiawei (author) / Zhang, Chuwei (author) / Liang, Lin (author)
Atmospheric Environment ; 327
2024-04-01
Article (Journal)
Electronic Resource
English
Biomass burning spatiotemporal variations over South and Southeast Asia
| Elsevier | 2020