In situ vertical characteristics of optical properties and heating rates of aerosol over Beijing
Characterizing vertical profiles of aerosol optical properties is important because relying on only the surface or column-integrated measurements cannot unambiguously constrain the radiative impacts of aerosol. This study presents series of vertical profiles of in situ measured multi-wavelength opti...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00050850 2023-05-15T13:06:57+02:00 In situ vertical characteristics of optical properties and heating rates of aerosol over Beijing Tian, Ping Liu, Dantong Zhao, Delong Yu, Chenjie Liu, Quan Huang, Mengyu Deng, Zhaoze Ran, Liang Wu, Yunfei Ding, Shuo Hu, Kang Zhao, Gang Zhao, Chunsheng Ding, Deping 2020-03 electronic https://doi.org/10.5194/acp-20-2603-2020 https://noa.gwlb.de/receive/cop_mods_00050850 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00050507/acp-20-2603-2020.pdf https://acp.copernicus.org/articles/20/2603/2020/acp-20-2603-2020.pdf eng eng Copernicus Publications Atmospheric Chemistry and Physics -- http://www.atmos-chem-phys.net/volumes_and_issues.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2069847 -- 1680-7324 https://doi.org/10.5194/acp-20-2603-2020 https://noa.gwlb.de/receive/cop_mods_00050850 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00050507/acp-20-2603-2020.pdf https://acp.copernicus.org/articles/20/2603/2020/acp-20-2603-2020.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2020 ftnonlinearchiv https://doi.org/10.5194/acp-20-2603-2020 2022-02-08T22:36:40Z Characterizing vertical profiles of aerosol optical properties is important because relying on only the surface or column-integrated measurements cannot unambiguously constrain the radiative impacts of aerosol. This study presents series of vertical profiles of in situ measured multi-wavelength optical properties of aerosols during three pollution events from November to December 2016 over the Beijing region. For all pollution events, the clean periods (CPs) before pollution initialization showed a higher scattering Ångström exponent (SAE) and a smaller asymmetry parameter (g) with relatively uniform vertical structures. The heavy pollution periods (HPs) showed an increased particle size, causing these parameters to vary in the opposite way. During the transition periods (TPs), regional transport of aged aerosols at higher altitudes was found. The Aerosol Robotic Network (AERONET) aerosol optical depth (AOD) matched the in situ measurements within 10 %; however the AERONET absorption optical depth (AAOD) was 10 %–20 % higher than the in situ measurements, and this positive discrepancy increased to 30 % at shorter wavelengths. The absorption of brown carbon (BrC) was identified by the increased-absorption Ångström exponent (AAE), and the heating rate of black carbon (BC) and BrC was estimated by computing the spectral absorption coefficient and actinic flux calculated by a radiative transfer model. BC and BrC had a heating rate of up to 0.18 and 0.05 K h−1 in the planetary boundary layer (PBL), respectively, during the pollution period. The fraction of BrC absorption increased from 12 % to 40 % in the PBL from the CP to the HP. Notably, a higher contribution of BrC heating was found above the PBL under polluted conditions. This study paints a full picture of shortwave heating impacts of carbonaceous aerosols during different stages of pollution events and highlights the increased contribution of BrC absorption especially at higher altitudes during pollution. Article in Journal/Newspaper Aerosol Robotic Network Niedersächsisches Online-Archiv NOA Atmospheric Chemistry and Physics 20 4 2603 2622 |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Tian, Ping Liu, Dantong Zhao, Delong Yu, Chenjie Liu, Quan Huang, Mengyu Deng, Zhaoze Ran, Liang Wu, Yunfei Ding, Shuo Hu, Kang Zhao, Gang Zhao, Chunsheng Ding, Deping In situ vertical characteristics of optical properties and heating rates of aerosol over Beijing |
topic_facet |
article Verlagsveröffentlichung |
description |
Characterizing vertical profiles of aerosol optical properties is important because relying on only the surface or column-integrated measurements cannot unambiguously constrain the radiative impacts of aerosol. This study presents series of vertical profiles of in situ measured multi-wavelength optical properties of aerosols during three pollution events from November to December 2016 over the Beijing region. For all pollution events, the clean periods (CPs) before pollution initialization showed a higher scattering Ångström exponent (SAE) and a smaller asymmetry parameter (g) with relatively uniform vertical structures. The heavy pollution periods (HPs) showed an increased particle size, causing these parameters to vary in the opposite way. During the transition periods (TPs), regional transport of aged aerosols at higher altitudes was found. The Aerosol Robotic Network (AERONET) aerosol optical depth (AOD) matched the in situ measurements within 10 %; however the AERONET absorption optical depth (AAOD) was 10 %–20 % higher than the in situ measurements, and this positive discrepancy increased to 30 % at shorter wavelengths. The absorption of brown carbon (BrC) was identified by the increased-absorption Ångström exponent (AAE), and the heating rate of black carbon (BC) and BrC was estimated by computing the spectral absorption coefficient and actinic flux calculated by a radiative transfer model. BC and BrC had a heating rate of up to 0.18 and 0.05 K h−1 in the planetary boundary layer (PBL), respectively, during the pollution period. The fraction of BrC absorption increased from 12 % to 40 % in the PBL from the CP to the HP. Notably, a higher contribution of BrC heating was found above the PBL under polluted conditions. This study paints a full picture of shortwave heating impacts of carbonaceous aerosols during different stages of pollution events and highlights the increased contribution of BrC absorption especially at higher altitudes during pollution. |
format |
Article in Journal/Newspaper |
author |
Tian, Ping Liu, Dantong Zhao, Delong Yu, Chenjie Liu, Quan Huang, Mengyu Deng, Zhaoze Ran, Liang Wu, Yunfei Ding, Shuo Hu, Kang Zhao, Gang Zhao, Chunsheng Ding, Deping |
author_facet |
Tian, Ping Liu, Dantong Zhao, Delong Yu, Chenjie Liu, Quan Huang, Mengyu Deng, Zhaoze Ran, Liang Wu, Yunfei Ding, Shuo Hu, Kang Zhao, Gang Zhao, Chunsheng Ding, Deping |
author_sort |
Tian, Ping |
title |
In situ vertical characteristics of optical properties and heating rates of aerosol over Beijing |
title_short |
In situ vertical characteristics of optical properties and heating rates of aerosol over Beijing |
title_full |
In situ vertical characteristics of optical properties and heating rates of aerosol over Beijing |
title_fullStr |
In situ vertical characteristics of optical properties and heating rates of aerosol over Beijing |
title_full_unstemmed |
In situ vertical characteristics of optical properties and heating rates of aerosol over Beijing |
title_sort |
in situ vertical characteristics of optical properties and heating rates of aerosol over beijing |
publisher |
Copernicus Publications |
publishDate |
2020 |
url |
https://doi.org/10.5194/acp-20-2603-2020 https://noa.gwlb.de/receive/cop_mods_00050850 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00050507/acp-20-2603-2020.pdf https://acp.copernicus.org/articles/20/2603/2020/acp-20-2603-2020.pdf |
genre |
Aerosol Robotic Network |
genre_facet |
Aerosol Robotic Network |
op_relation |
Atmospheric Chemistry and Physics -- http://www.atmos-chem-phys.net/volumes_and_issues.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2069847 -- 1680-7324 https://doi.org/10.5194/acp-20-2603-2020 https://noa.gwlb.de/receive/cop_mods_00050850 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00050507/acp-20-2603-2020.pdf https://acp.copernicus.org/articles/20/2603/2020/acp-20-2603-2020.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/acp-20-2603-2020 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
20 |
container_issue |
4 |
container_start_page |
2603 |
op_container_end_page |
2622 |
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1766028097479507968 |