Contribution of Fire Emissions to PM<sub>2.5</sub> and Its Transport Mechanism Over the Yungui Plateau, China During 2015–2019

Zhu, Jun; Yue, Xu; Che, Huizheng; Xia, Xiangao; Lei, Yadong; Wang, Jun; Zhao, Tianliang; Yu, Xiangyao; Zhou, Hao; Liao, Hong

doi:10.1029/2022jd036734

Cited by 10 publications

(6 citation statements)

References 74 publications

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“…The percentages of days that mean PM 2.5 concentrations exceeded the polluted level (75 μg m −3 ) during March-April of 2015-2019 were 6.7-18.7% for southwest cities (Dehong, Lincang, Puer, and Xishuangbannan) and 1.0-12.8% for the southeast cities (Honghe, Wenshan, and Yuxi) of Yunnan Province, respectively. Still, the mean PM 2.5 concentrations in Kunming (KM), a city in the middle of Yunnan Province, reached the polluted level only for 3 days (Zhu, et al, 2022), which might be affected by the synoptic condition over Southeast Asia and lowlatitude plateau in China. In this study, the impacts of BB over Southeast Asia on PM concentrations and aerosol properties in downwind regions of Yunnan Province in China in March-April 2019 were comprehensively investigated using an integrated data set from ground observations, satellite retrievals, reanalysis data, and model simulations.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Impacts of biomass burning in Southeast Asia on aerosols over the low-latitude plateau in China: An analysis of a typical pollution event

Fan

Li²,

Han³

et al. 2023

Front. Environ. Sci.

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From March to April, widespread forest fires and agro-residue burning frequently occur in Southeast Asia, which release large amounts of gas species and aerosols and impact air quality over the wide source and downwind regions. In this study, we investigated the impact of biomass burning (BB) over Southeast Asia on particulate matter concentrations and aerosol properties in downwind areas of the low-latitude plateau from 1 March to 30 April 2019, with a focus on a typical pollution event in Kunming (KM), the capital of Yunnan Province, by using a wide variety of observations from the Chenggong ground monitoring station in Yunnan University, an air quality network in China, satellite retrievals and ERA-5 reanalysis data and numerical simulation. A regional pollution event contributed by BB pollutants from Southeast Asia and the India-Myanmar trough occurred in Yunnan Province on 31 March to 1 April 2019, which was the only typical pollution event that pollution transmission ran through central Yunnan Province from south to north since 2013, when the Airborne Pollution Action Plan was unveiled by China government. The daily mean PM2.5, PM1, and black carbon concentrations increased by 73.3 μg m−3(78%), 70.5 μg m−3 (80%), and 7.7 μg m−3 (83%), respectively, and the scattering and absorbing coefficients increased by 471.6 Mm−1 and 63.5 Mm−1, respectively, at the Chenggong station. The southwest winds exceeding 2 km vertically thick appeared in front of the India-Myanmar trough over the fire regions, pushing BB plumes northward into Yunnan Province. The model results show that 59.5% of PM2.5 mass produced by BB in Yunnan Province was sourced from the Myanmar-Thailand border, and 29.3% was from western Myanmar at a lower altitude (<4.9 km), which indicated that BB in the Myanmar-Thailand border was the dominant contributor.

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Section: Conclusion and Discussionmentioning

confidence: 99%

Impacts of biomass burning in Southeast Asia on aerosols over the low-latitude plateau in China: An analysis of a typical pollution event

Fan

Li²,

Han³

et al. 2023

Front. Environ. Sci.

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“…(2022) and J. Zhu et al. (2002) estimated the wildfire component of PM 2.5 over the Yungui Plateau, China, and its meteorological contributors, concluding that fires (including long‐range smoke transport from eastern Myanmar, northern Laos, and Vietnam) contributed approximately half of the vertical PM 2.5 at a height of 3–4 km. Loría‐Salazar et al.…”

Section: How Does Fire Work? Physical and Chemical Processesmentioning

confidence: 99%

“…(2022) and J. Zhu et al. (2002) found elevated abundance of biomass‐burning tracers (levoglucosan, mannosan, and galactosan) that suggested long‐range atmospheric effects of fires. Studying legacy effects of fires associated with deforestation in the Amazon region, de Oliveira et al.…”

Section: Fire Effects On Biogeochemical Cycles and Ecosystemsmentioning

confidence: 99%

Fire in the Earth System: Introduction to the Special Collection

et al. 2023

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Fire has always been an important component of many ecosystems, but anthropogenic global climate change is now altering fire regimes over much of Earth's land surface, spurring a more urgent need to understand the physical, biological, and chemical processes associated with fire as well as its effects on human societies. In 2020, AGU launched a Special Collection that spanned 10 journals, soliciting papers under the theme “Fire in the Earth System” to encourage state‐of‐the‐art publications in fire‐related science. The completed Special Collection comprises more than 100 papers. Here, we summarize the articles published in this collection, considering them to be grouped into seven themes: paleofire and its ties to climate; evolution of fire patterns in the recent past and the future, including the effects of ongoing climate change; physical (atmospheric) and chemical processes associated with fire; ecosystem effects, including on biogeochemical cycles; physical landscape change after fire and its associated hazards; fire effects on water quality, air quality, and human health; and new methods and technologies applied to fire research.

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“…This season of South China is also often affected by air pollution, having local surface concentrations of the particular matter with diameters of ≤2.5 μm (PM 2.5 ) reaching 100+ μg m −3 (Cui et al., 2015; Wu et al., 2022). Meanwhile, agriculture‐related wildfires frequently occur in the Indo‐China Peninsula (Zhu et al., 2022). The released biomass‐burning aerosols can be long‐range transported to South China, increasing the mid‐tropospheric aerosols (Ding et al., 2021) and perturbing cloud properties in the mixed‐phase region.…”

Section: Introductionmentioning

confidence: 99%

Spatiotemporal Variations of the Effects of Aerosols on Clouds and Precipitation in an Extreme‐Rain‐Producing MCS in South China

Yun,

Zhang,

Gao

et al. 2024

JGR Atmospheres

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Previous studies focus mostly on the storm‐scale‐averaged precipitation responses to aerosols. Yet, the spatiotemporal variations of the aerosol effects can lead to localized and short‐duration precipitation changes that are more relevant for improving rainfall forecasts. Here, we investigate the cloud and precipitation responses to aerosols during different life stages and in subregions with various cloud top heights of an extreme‐rain‐producing mesoscale convective system (MCS) in South China using the coupled WRF‐Chem model. Results show mostly similar MCS‐averaged precipitation responses between the polluted and clean conditions due to compensations among the subregions. However, the spatiotemporally discretized changes are divergent. Specifically, during the developing stage, aerosols increase precipitation in all subregions through generating larger precipitating hydrometers produced from the accretion of more cloud droplets. The most prominent precipitation enhancement occurs in the subregion with the strongest clean‐condition rainfall. In the mature stage, the CCN activation abates, and so does the aerosol‐induced precipitation increase. In the mixed‐phase (−40°C < Ttop < 0°C) and cold (Ttop ≤ −40°C) cloud top subregions, aerosols also reduce the melting of the ice‐phase precipitating hydrometers, which process becomes more important to precipitation formation during the mature stage. Therefore, the drop of rainfall rate is more significant in these ice‐phase‐involved subregions, bringing the polluted precipitation to be less than that in the clean condition during the mature stage. The substantial spatiotemporal variations of the aerosol effects and the early intensification of heavy precipitation suggest the importance of incorporating aerosols in the modeling and prediction of regional heavy rainfall events.

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Contribution of Fire Emissions to PM_2.5 and Its Transport Mechanism Over the Yungui Plateau, China During 2015–2019

Cited by 10 publications

References 74 publications

Impacts of biomass burning in Southeast Asia on aerosols over the low-latitude plateau in China: An analysis of a typical pollution event

Impacts of biomass burning in Southeast Asia on aerosols over the low-latitude plateau in China: An analysis of a typical pollution event

Fire in the Earth System: Introduction to the Special Collection

Spatiotemporal Variations of the Effects of Aerosols on Clouds and Precipitation in an Extreme‐Rain‐Producing MCS in South China

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Contribution of Fire Emissions to PM2.5 and Its Transport Mechanism Over the Yungui Plateau, China During 2015–2019

Cited by 10 publications

References 74 publications

Impacts of biomass burning in Southeast Asia on aerosols over the low-latitude plateau in China: An analysis of a typical pollution event

Impacts of biomass burning in Southeast Asia on aerosols over the low-latitude plateau in China: An analysis of a typical pollution event

Fire in the Earth System: Introduction to the Special Collection

Spatiotemporal Variations of the Effects of Aerosols on Clouds and Precipitation in an Extreme‐Rain‐Producing MCS in South China

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Contribution of Fire Emissions to PM_2.5 and Its Transport Mechanism Over the Yungui Plateau, China During 2015–2019