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Strong light scattering of highly oxygenated organic aerosols impacts significantly on visibility degradation

Secondary organic aerosols (SOAs) account for a large fraction of atmospheric aerosol mass and play significant roles in visibility impairment by scattering solar radiation. However, comprehensive evaluations of SOA scattering abilities under ambient relative humidity (RH) conditions on the basis of...

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Published in:Atmospheric chemistry and physics 2022-06, Vol.22 (11), p.7713-7726
Main Authors: Liu, Li, Kuang, Ye, Zhai, Miaomiao, Xue, Biao, He, Yao, Tao, Jun, Luo, Biao, Xu, Wanyun, Tao, Jiangchuan, Yin, Changqin, Li, Fei, Xu, Hanbing, Deng, Tao, Deng, Xuejiao, Tan, Haobo, Shao, Min
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cited_by cdi_FETCH-LOGICAL-c480t-589a0fa2b435c83ad55cab6fdb58cbd81922cfc3c1b0d46177b4d59e7cee0de33
cites cdi_FETCH-LOGICAL-c480t-589a0fa2b435c83ad55cab6fdb58cbd81922cfc3c1b0d46177b4d59e7cee0de33
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creator Liu, Li
Kuang, Ye
Zhai, Miaomiao
Xue, Biao
He, Yao
Tao, Jun
Luo, Biao
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Tao, Jiangchuan
Yin, Changqin
Li, Fei
Xu, Hanbing
Deng, Tao
Deng, Xuejiao
Tan, Haobo
Shao, Min
description Secondary organic aerosols (SOAs) account for a large fraction of atmospheric aerosol mass and play significant roles in visibility impairment by scattering solar radiation. However, comprehensive evaluations of SOA scattering abilities under ambient relative humidity (RH) conditions on the basis of field measurements are still lacking due to the difficulty of simultaneously direct quantifications of SOA scattering efficiency in dry state and SOA water uptake abilities. In this study, field measurements of aerosol chemical and physical properties were conducted in winter in Guangzhou (lasting about 3 months) using a humidified nephelometer system and aerosol chemical speciation monitor. A modified multilinear regression model was proposed to retrieve dry-state mass scattering efficiencies (MSEs, defined as scattering coefficient per unit aerosol mass) of aerosol components. The more oxidized oxygenated organic aerosol (MOOA) with an O/C ratio of 1.17 was identified as the most efficient light scattering aerosol component. On average, 34 % mass contribution of MOOA to total submicron organic aerosol mass contributed 51 % of dry-state organic aerosol scattering. The overall organic aerosol hygroscopicity parameter κOA was quantified directly through hygroscopicity closure, and hygroscopicity parameters of SOA components were further retrieved using a multilinear regression model by assuming hydrophobic properties of primary organic aerosols. The highest water uptake ability of MOOA among organic aerosol factors was revealed with κMOOA reaching 0.23, thus further enhancing the fractional contribution of MOOA in ambient organic aerosol scattering. In particular, the scattering abilities of MOOA were found to be even higher than those of ammonium nitrate under RH of
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However, comprehensive evaluations of SOA scattering abilities under ambient relative humidity (RH) conditions on the basis of field measurements are still lacking due to the difficulty of simultaneously direct quantifications of SOA scattering efficiency in dry state and SOA water uptake abilities. In this study, field measurements of aerosol chemical and physical properties were conducted in winter in Guangzhou (lasting about 3 months) using a humidified nephelometer system and aerosol chemical speciation monitor. A modified multilinear regression model was proposed to retrieve dry-state mass scattering efficiencies (MSEs, defined as scattering coefficient per unit aerosol mass) of aerosol components. The more oxidized oxygenated organic aerosol (MOOA) with an O/C ratio of 1.17 was identified as the most efficient light scattering aerosol component. On average, 34 % mass contribution of MOOA to total submicron organic aerosol mass contributed 51 % of dry-state organic aerosol scattering. The overall organic aerosol hygroscopicity parameter κOA was quantified directly through hygroscopicity closure, and hygroscopicity parameters of SOA components were further retrieved using a multilinear regression model by assuming hydrophobic properties of primary organic aerosols. The highest water uptake ability of MOOA among organic aerosol factors was revealed with κMOOA reaching 0.23, thus further enhancing the fractional contribution of MOOA in ambient organic aerosol scattering. In particular, the scattering abilities of MOOA were found to be even higher than those of ammonium nitrate under RH of &lt;70 %, which was identified as the most efficient inorganic scattering aerosol component, demonstrating that MOOA had the strongest scattering abilities in ambient air (average RH of 57 %) during winter in Guangzhou. During the observation period, secondary aerosols contributed dominantly to visibility degradation (∼70 %), with substantial contributions from MOOA (16 % on average), demonstrating significant impacts of MOOA on visibility degradation. The findings of this study demonstrate that more attention needs to be paid to SOA property changes in future visibility improvement investigations. Also, more comprehensive studies on MOOA physical properties and chemical formation are needed to better parameterize its radiative effects in models and implement targeted control strategies on MOOA precursors for visibility improvement.</description><identifier>ISSN: 1680-7324</identifier><identifier>ISSN: 1680-7316</identifier><identifier>EISSN: 1680-7324</identifier><identifier>DOI: 10.5194/acp-22-7713-2022</identifier><language>eng</language><publisher>Katlenburg-Lindau: Copernicus GmbH</publisher><subject>Aerosol scattering ; Aerosols ; Ammonium ; Ammonium compounds ; Ammonium nitrate ; Analysis ; Atmospheric aerosols ; Atmospheric models ; Chemical speciation ; Components ; Degradation ; Efficiency ; Hydrophobicity ; Hygroscopicity ; Identification ; Light scattering ; Mass ; Nephelometers ; Nitrates ; Oxygenation ; Parameters ; Physical properties ; Regression models ; Relative humidity ; Scattering coefficient ; Secondary aerosols ; Solar radiation ; Speciation ; Uptake ; Visibility ; Water uptake ; Winter</subject><ispartof>Atmospheric chemistry and physics, 2022-06, Vol.22 (11), p.7713-7726</ispartof><rights>COPYRIGHT 2022 Copernicus GmbH</rights><rights>2022. 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However, comprehensive evaluations of SOA scattering abilities under ambient relative humidity (RH) conditions on the basis of field measurements are still lacking due to the difficulty of simultaneously direct quantifications of SOA scattering efficiency in dry state and SOA water uptake abilities. In this study, field measurements of aerosol chemical and physical properties were conducted in winter in Guangzhou (lasting about 3 months) using a humidified nephelometer system and aerosol chemical speciation monitor. A modified multilinear regression model was proposed to retrieve dry-state mass scattering efficiencies (MSEs, defined as scattering coefficient per unit aerosol mass) of aerosol components. The more oxidized oxygenated organic aerosol (MOOA) with an O/C ratio of 1.17 was identified as the most efficient light scattering aerosol component. On average, 34 % mass contribution of MOOA to total submicron organic aerosol mass contributed 51 % of dry-state organic aerosol scattering. The overall organic aerosol hygroscopicity parameter κOA was quantified directly through hygroscopicity closure, and hygroscopicity parameters of SOA components were further retrieved using a multilinear regression model by assuming hydrophobic properties of primary organic aerosols. The highest water uptake ability of MOOA among organic aerosol factors was revealed with κMOOA reaching 0.23, thus further enhancing the fractional contribution of MOOA in ambient organic aerosol scattering. In particular, the scattering abilities of MOOA were found to be even higher than those of ammonium nitrate under RH of &lt;70 %, which was identified as the most efficient inorganic scattering aerosol component, demonstrating that MOOA had the strongest scattering abilities in ambient air (average RH of 57 %) during winter in Guangzhou. During the observation period, secondary aerosols contributed dominantly to visibility degradation (∼70 %), with substantial contributions from MOOA (16 % on average), demonstrating significant impacts of MOOA on visibility degradation. The findings of this study demonstrate that more attention needs to be paid to SOA property changes in future visibility improvement investigations. Also, more comprehensive studies on MOOA physical properties and chemical formation are needed to better parameterize its radiative effects in models and implement targeted control strategies on MOOA precursors for visibility improvement.</abstract><cop>Katlenburg-Lindau</cop><pub>Copernicus GmbH</pub><doi>10.5194/acp-22-7713-2022</doi><tpages>14</tpages><orcidid>https://orcid.org/0000-0003-4813-9784</orcidid><orcidid>https://orcid.org/0000-0002-0936-4869</orcidid><oa>free_for_read</oa></addata></record>
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subjects Aerosol scattering
Aerosols
Ammonium
Ammonium compounds
Ammonium nitrate
Analysis
Atmospheric aerosols
Atmospheric models
Chemical speciation
Components
Degradation
Efficiency
Hydrophobicity
Hygroscopicity
Identification
Light scattering
Mass
Nephelometers
Nitrates
Oxygenation
Parameters
Physical properties
Regression models
Relative humidity
Scattering coefficient
Secondary aerosols
Solar radiation
Speciation
Uptake
Visibility
Water uptake
Winter
title Strong light scattering of highly oxygenated organic aerosols impacts significantly on visibility degradation
url http://sfxeu10.hosted.exlibrisgroup.com/loughborough?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2025-01-08T23%3A42%3A37IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-gale_doaj_&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.atitle=Strong%20light%20scattering%20of%20highly%20oxygenated%20organic%20aerosols%20impacts%20significantly%20on%20visibility%20degradation&rft.jtitle=Atmospheric%20chemistry%20and%20physics&rft.au=Liu,%20Li&rft.date=2022-06-15&rft.volume=22&rft.issue=11&rft.spage=7713&rft.epage=7726&rft.pages=7713-7726&rft.issn=1680-7324&rft.eissn=1680-7324&rft_id=info:doi/10.5194/acp-22-7713-2022&rft_dat=%3Cgale_doaj_%3EA707223878%3C/gale_doaj_%3E%3Cgrp_id%3Ecdi_FETCH-LOGICAL-c480t-589a0fa2b435c83ad55cab6fdb58cbd81922cfc3c1b0d46177b4d59e7cee0de33%3C/grp_id%3E%3Coa%3E%3C/oa%3E%3Curl%3E%3C/url%3E&rft_id=info:oai/&rft_pqid=2676455208&rft_id=info:pmid/&rft_galeid=A707223878&rfr_iscdi=true