Aerosol optical characteristics and radiative forcing in urban Beijing

Zhao, Shanshan; Hu, Bo; Du, Chaojie; Tang, Liqin; Ma, Yongjing; Liu, Hui; Zou, Jianan; Liu, Zirui; Wang, Jie; Wang, Yuesi

doi:10.1016/j.atmosenv.2019.05.034

Cited by 13 publications

(3 citation statements)

References 65 publications

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“…With shallow boundary layer height and enhanced emissions from heavy-duty trucks, σ ab reached the maximum at night. During the study period, SSA showed a significant peak in the afternoon in the four seasons, which was similar to previous studies in urban Beijing (Zhao et al, 2019;Wang et al, 2019). Higher SSA was shown in the afternoon, which was mainly related to the reduction in absorbing aerosol emissions and more secondary scattering aerosol produced by strong chemical reactions under intensive solar radiation and high temperature in the afternoon (Han et al, 2017).…”

Section: Temporal Variation In Aerosol Optical Propertiessupporting

confidence: 87%

“…As one of the world's most populous and rapidly developing megacities, Beijing experienced rapid economic growth and urbanization, accompanied by severe air pollution. Many in situ measurements of aerosol optical properties have been conducted in Beijing (Bergin et al, 2001;He et al, 2009;Garland et al, 2009;Jing et al, 2015;Wang et al, 2019;Zhao et al, 2019;Xia et al, 2020). Previous studies found that high aerosol loading leads to large σ ab in Beijing (Jing et al, 2015;Garland et al, 2009;Bergin et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Measurement report: Rapid decline of aerosol absorption coefficient and aerosol optical property effects on radiative forcing in an urban area of Beijing from 2018 to 2021

Sun

Xia

et al. 2023

Atmos. Chem. Phys.

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Abstract. Reliable observations of aerosol optical properties are crucial for quantifying the radiative forcing of climate. The simultaneous measurements of aerosol optical properties at three wavelengths for PM1 and PM10 were conducted in urban Beijing from March 2018 to February 2022. The aerosol absorption coefficient (σab) at 550 nm of PM10 and PM1 decreased by 55.0 % and 53.5 % from 2018 to 2021. The significant reduction in σab may be related to reduced primary emissions caused by effective air pollution control measures. PM2.5 mass concentration decreased by 34.4 % from 2018 to 2021. Single scattering albedo (SSA) increased from 0.89±0.04 for PM10 (0.87±0.05 for PM1) in 2018 to 0.93±0.03 for PM10 (0.91±0.04 for PM1) in 2021. Increasing SSA and decreasing PM2.5 mass concentration suggest that the fraction of absorbing aerosols decreased with improved air quality due to pollution control measures being taken. The annual average submicron absorption ratio (Rab) increased from 86.1 % in 2018 to 89.2 % in 2021, suggesting that fine particles are the main contributors to total PM10 absorption and that the contribution of fine particles to absorption became more important. The absorption Ångström exponent (AAE) in winter decreased from 2018 to 2021, implying a decreasing contribution from brown carbon to light absorption, which may relate to the reduced emissions of biomass burning and coal combustion. During the study period, aerosol radiative forcing efficiency became more negative, mainly influenced by increasing SSA and was −27.0 and −26.2 W m−2 per aerosol optical depth (AOD) for PM10 and PM1 in 2021. Higher σab and PM2.5 mass concentrations were primarily distributed in clusters 4 and 5, transported from the south and the west of Beijing each year. σab and PM2.5 corresponding to clusters 4 and 5 decreased evidently from 2018 to 2021, which may result from the control of source emissions in surrounding regions of Beijing. The 4-year data presented in this study provide critical optical parameters for radiative forcing assessment within two size ranges and are helpful for evaluating the effectiveness of clean air action.

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Section: Temporal Variation In Aerosol Optical Propertiessupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Measurement report: Rapid decline of aerosol absorption coefficient and aerosol optical property effects on radiative forcing in an urban area of Beijing from 2018 to 2021

Sun

Xia

et al. 2023

Atmos. Chem. Phys.

View full text Add to dashboard Cite

show abstract

“…They are often observed as smoke, dust, fog, or haze, which significantly affect climatic change, environment condition, and air quality not only at a local scale, but also regional and global ones [1][2][3][4]. By absorbing or scattering incident electromagnetic radiation, aerosols have obvious radiative forcing effects on climate and environment [5,6] and also influence the radiative energy balance [7,8]. Fine particles and PM 2.5 , aerosols with aerodynamic diameters of less than 2.5 µm, can seriously endanger public health [9,10], due to the harm to the respiration and blood circulation system of inhabitants [11].…”

Section: Introductionmentioning

confidence: 99%

Monitoring the Spatial Variation of Aerosol Optical Depth and Its Correlation with Land Use/Land Cover in Wuhan, China: A Perspective of Urban Planning

Xie

Sun

2021

IJERPH

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Aerosols significantly affect environmental conditions, air quality, and public health locally, regionally, and globally. Examining the impact of land use/land cover (LULC) on aerosol optical depth (AOD) helps to understand how human activities influence air quality and develop suitable solutions. The Landsat 8 image and Moderate Resolution Imaging Spectroradiometer (MODIS) aerosol products in summer in 2018 were used in LULC classification and AOD retrieval in this study. Spatial statistics and correlation analysis about the relationship between LULC and AOD were performed to examine the impact of LULC on AOD in summer in Wuhan, China. Results indicate that the AOD distribution expressed an obvious “basin effect” in urban development areas: higher AOD values concentrated in water bodies with lower terrain, which were surrounded by the high buildings or mountains with lower AOD values. The AOD values were negatively correlated with the vegetated areas while positively correlated to water bodies and construction lands. The impact of LULC on AOD varied with different contexts in all cases, showing a “context effect”. The regression correlations among the normalized difference vegetation index (NDVI), normalized difference built-up index (NDBI), normalized difference water index (NDWI), and AOD in given landscape contexts were much stronger than those throughout the whole study area. These findings provide sound evidence for urban planning, land use management and air quality improvement.

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Characteristics of water-soluble inorganic aerosol pollution and its meteorological response in Wuhan, Central China

Zang

Zhang

Zhu

et al. 2021

Atmospheric Pollution Research

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Aerosol optical characteristics and radiative forcing in urban Beijing

Cited by 13 publications

References 65 publications

Measurement report: Rapid decline of aerosol absorption coefficient and aerosol optical property effects on radiative forcing in an urban area of Beijing from 2018 to 2021

Measurement report: Rapid decline of aerosol absorption coefficient and aerosol optical property effects on radiative forcing in an urban area of Beijing from 2018 to 2021

Monitoring the Spatial Variation of Aerosol Optical Depth and Its Correlation with Land Use/Land Cover in Wuhan, China: A Perspective of Urban Planning

Characteristics of water-soluble inorganic aerosol pollution and its meteorological response in Wuhan, Central China

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