Measurement report: On the difference in aerosol hygroscopicity between high and low relative humidity conditions in the North China Plain
<p>Atmospheric processes, including both primary emissions and secondary formation, may exert complex effects on aerosol hygroscopicity, which is of significant importance in understanding and quantifying the effect of aerosols on climate and human health. In order to explore the influence of...
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| Language: | English |
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Copernicus Publications
2022-04-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | https://acp.copernicus.org/articles/22/4599/2022/acp-22-4599-2022.pdf |
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| author | J. Shi J. Shi J. Hong J. Hong N. Ma N. Ma Q. Luo Q. Luo Y. He Y. He H. Xu H. Tan H. Tan Q. Wang Q. Wang J. Tao J. Tao Y. Zhou Y. Zhou S. Han S. Han L. Peng L. Peng L. Xie L. Xie G. Zhou W. Xu Y. Sun Y. Sun Y. Sun Y. Cheng H. Su |
| author_facet | J. Shi J. Shi J. Hong J. Hong N. Ma N. Ma Q. Luo Q. Luo Y. He Y. He H. Xu H. Tan H. Tan Q. Wang Q. Wang J. Tao J. Tao Y. Zhou Y. Zhou S. Han S. Han L. Peng L. Peng L. Xie L. Xie G. Zhou W. Xu Y. Sun Y. Sun Y. Sun Y. Cheng H. Su |
| author_sort | J. Shi |
| collection | DOAJ |
| description | <p>Atmospheric processes, including both primary emissions and
secondary formation, may exert complex effects on aerosol hygroscopicity,
which is of significant importance in understanding and quantifying the
effect of aerosols on climate and human health. In order to explore the
influence of local emissions and secondary formation processes on aerosol
hygroscopicity, we investigated the hygroscopic properties of submicron
aerosol particles at a rural site in the North China Plain (NCP) in winter
2018. This was conducted by simultaneous measurements of aerosol
hygroscopicity and chemical composition, using a custom-built hygroscopic
tandem differential mobility analyzer (HTDMA) and a capture-vaporizer
time-of-flight aerosol chemical speciation monitor (CV-ToF-ACSM). The
hygroscopicity results showed that the particles during the entire campaign
were mainly externally mixed, with a more hygroscopic (MH) mode and a less
hygroscopic (LH) mode. The mean hygroscopicity parameter (<span class="inline-formula"><i>κ</i><sub>mean</sub></span>) values derived from hygroscopicity measurements for particles at 60,
100, 150, and 200 nm were 0.16, 0.18, 0.16, and 0.15, respectively. During
this study, we classified two distinct episodes with different relative humidity (RH) and temperature (<span class="inline-formula"><i>T</i></span>) conditions, indicative of different primary emissions and secondary
formation processes. It was observed that aerosols at all measured sizes
were more hygroscopic under the high-RH (HRH) episode than those under the
low-RH (LRH) episode. During the LRH, <span class="inline-formula"><i>κ</i></span> decreased with increasing
particle size, which may be explained by the enhanced domestic heating at
low temperature, causing large emissions of non-hygroscopic or less hygroscopic primary
aerosols. This is particularly obvious for 200 nm particles, with a dominant
number fraction (<span class="inline-formula">>50</span> %) of LH mode particles. Using <span class="inline-formula">O:C</span>-dependent hygroscopic parameters of secondary organic compounds (<span class="inline-formula"><i>κ</i><sub>SOA</sub></span>), closure analysis between the HTDMA-measured <span class="inline-formula"><i>κ</i></span> and the
ACSM-derived <span class="inline-formula"><i>κ</i></span> was carried out. The results showed that <span class="inline-formula"><i>κ</i><sub>SOA</sub></span> under the LRH episode was less sensitive to the changes in organic
oxidation level, while <span class="inline-formula"><i>κ</i><sub>SOA</sub></span> under HRH had a relatively
stronger dependency on the organic <span class="inline-formula">O:C</span> ratio. This feature suggests that the
different sources and aerosol evolution processes, partly resulting from the
variation in atmospheric RH and <span class="inline-formula"><i>T</i></span> conditions, may lead to significant changes in
aerosol chemical composition, which will further influence their
corresponding physical properties.</p> |
| first_indexed | 2024-04-13T02:41:40Z |
| format | Article |
| id | doaj.art-d7f1ff555f0248bb9d2f4321d233d971 |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-04-13T02:41:40Z |
| publishDate | 2022-04-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-d7f1ff555f0248bb9d2f4321d233d9712022-12-22T03:06:11ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242022-04-01224599461310.5194/acp-22-4599-2022Measurement report: On the difference in aerosol hygroscopicity between high and low relative humidity conditions in the North China PlainJ. Shi0J. Shi1J. Hong2J. Hong3N. Ma4N. Ma5Q. Luo6Q. Luo7Y. He8Y. He9H. Xu10H. Tan11H. Tan12Q. Wang13Q. Wang14J. Tao15J. Tao16Y. Zhou17Y. Zhou18S. Han19S. Han20L. Peng21L. Peng22L. Xie23L. Xie24G. Zhou25W. Xu26Y. Sun27Y. Sun28Y. Sun29Y. Cheng30H. Su31Institute for Environmental and Climate Research, Jinan University, Guangzhou, Guangdong 511443, ChinaGuangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality, Guangzhou, ChinaInstitute for Environmental and Climate Research, Jinan University, Guangzhou, Guangdong 511443, ChinaGuangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality, Guangzhou, ChinaInstitute for Environmental and Climate Research, Jinan University, Guangzhou, Guangdong 511443, ChinaGuangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality, Guangzhou, ChinaInstitute for Environmental and Climate Research, Jinan University, Guangzhou, Guangdong 511443, ChinaGuangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality, Guangzhou, ChinaInstitute for Environmental and Climate Research, Jinan University, Guangzhou, Guangdong 511443, ChinaGuangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality, Guangzhou, ChinaExperimental Teaching Center, Sun Yat-sen University, Guangzhou 510275, ChinaGuangdong Provincial Key Laboratory of Regional Numerical Weather Prediction, Institute of Tropical and Marine Meteorology, CMA, Guangzhou 510640, ChinaFoshan Meteorological Service of Guangdong, Foshan 528010, ChinaInstitute for Environmental and Climate Research, Jinan University, Guangzhou, Guangdong 511443, ChinaGuangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality, Guangzhou, ChinaInstitute for Environmental and Climate Research, Jinan University, Guangzhou, Guangdong 511443, ChinaGuangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality, Guangzhou, ChinaInstitute for Environmental and Climate Research, Jinan University, Guangzhou, Guangdong 511443, ChinaGuangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality, Guangzhou, ChinaInstitute for Environmental and Climate Research, Jinan University, Guangzhou, Guangdong 511443, ChinaGuangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality, Guangzhou, ChinaInstitute for Environmental and Climate Research, Jinan University, Guangzhou, Guangdong 511443, ChinaGuangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality, Guangzhou, ChinaInstitute for Environmental and Climate Research, Jinan University, Guangzhou, Guangdong 511443, ChinaGuangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality, Guangzhou, ChinaHebei Gucheng, Agrometeorology, National Observation and Research Station, Chinese Academy of Meteorological Sciences, Beijing 100081, ChinaHebei Gucheng, Agrometeorology, National Observation and Research Station, Chinese Academy of Meteorological Sciences, Beijing 100081, ChinaState Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, ChinaCollege of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, ChinaCenter for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, ChinaMultiphase Chemistry Department, Max Planck Institute for Chemistry, Mainz 55128, GermanyMultiphase Chemistry Department, Max Planck Institute for Chemistry, Mainz 55128, Germany<p>Atmospheric processes, including both primary emissions and secondary formation, may exert complex effects on aerosol hygroscopicity, which is of significant importance in understanding and quantifying the effect of aerosols on climate and human health. In order to explore the influence of local emissions and secondary formation processes on aerosol hygroscopicity, we investigated the hygroscopic properties of submicron aerosol particles at a rural site in the North China Plain (NCP) in winter 2018. This was conducted by simultaneous measurements of aerosol hygroscopicity and chemical composition, using a custom-built hygroscopic tandem differential mobility analyzer (HTDMA) and a capture-vaporizer time-of-flight aerosol chemical speciation monitor (CV-ToF-ACSM). The hygroscopicity results showed that the particles during the entire campaign were mainly externally mixed, with a more hygroscopic (MH) mode and a less hygroscopic (LH) mode. The mean hygroscopicity parameter (<span class="inline-formula"><i>κ</i><sub>mean</sub></span>) values derived from hygroscopicity measurements for particles at 60, 100, 150, and 200 nm were 0.16, 0.18, 0.16, and 0.15, respectively. During this study, we classified two distinct episodes with different relative humidity (RH) and temperature (<span class="inline-formula"><i>T</i></span>) conditions, indicative of different primary emissions and secondary formation processes. It was observed that aerosols at all measured sizes were more hygroscopic under the high-RH (HRH) episode than those under the low-RH (LRH) episode. During the LRH, <span class="inline-formula"><i>κ</i></span> decreased with increasing particle size, which may be explained by the enhanced domestic heating at low temperature, causing large emissions of non-hygroscopic or less hygroscopic primary aerosols. This is particularly obvious for 200 nm particles, with a dominant number fraction (<span class="inline-formula">>50</span> %) of LH mode particles. Using <span class="inline-formula">O:C</span>-dependent hygroscopic parameters of secondary organic compounds (<span class="inline-formula"><i>κ</i><sub>SOA</sub></span>), closure analysis between the HTDMA-measured <span class="inline-formula"><i>κ</i></span> and the ACSM-derived <span class="inline-formula"><i>κ</i></span> was carried out. The results showed that <span class="inline-formula"><i>κ</i><sub>SOA</sub></span> under the LRH episode was less sensitive to the changes in organic oxidation level, while <span class="inline-formula"><i>κ</i><sub>SOA</sub></span> under HRH had a relatively stronger dependency on the organic <span class="inline-formula">O:C</span> ratio. This feature suggests that the different sources and aerosol evolution processes, partly resulting from the variation in atmospheric RH and <span class="inline-formula"><i>T</i></span> conditions, may lead to significant changes in aerosol chemical composition, which will further influence their corresponding physical properties.</p>https://acp.copernicus.org/articles/22/4599/2022/acp-22-4599-2022.pdf |
| spellingShingle | J. Shi J. Shi J. Hong J. Hong N. Ma N. Ma Q. Luo Q. Luo Y. He Y. He H. Xu H. Tan H. Tan Q. Wang Q. Wang J. Tao J. Tao Y. Zhou Y. Zhou S. Han S. Han L. Peng L. Peng L. Xie L. Xie G. Zhou W. Xu Y. Sun Y. Sun Y. Sun Y. Cheng H. Su Measurement report: On the difference in aerosol hygroscopicity between high and low relative humidity conditions in the North China Plain Atmospheric Chemistry and Physics |
| title | Measurement report: On the difference in aerosol hygroscopicity between high and low relative humidity conditions in the North China Plain |
| title_full | Measurement report: On the difference in aerosol hygroscopicity between high and low relative humidity conditions in the North China Plain |
| title_fullStr | Measurement report: On the difference in aerosol hygroscopicity between high and low relative humidity conditions in the North China Plain |
| title_full_unstemmed | Measurement report: On the difference in aerosol hygroscopicity between high and low relative humidity conditions in the North China Plain |
| title_short | Measurement report: On the difference in aerosol hygroscopicity between high and low relative humidity conditions in the North China Plain |
| title_sort | measurement report on the difference in aerosol hygroscopicity between high and low relative humidity conditions in the north china plain |
| url | https://acp.copernicus.org/articles/22/4599/2022/acp-22-4599-2022.pdf |
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