Vertical characteristics of aerosol hygroscopicity and impacts on optical properties over the North China Plain during winter
<p>The water uptake of aerosol influences its optical depth and capacity for cloud formation, depending on the vertical profile of aerosol hygroscopicity because of different solar radiation received and supersaturation (SS) conditions at different atmospheric levels. Such information is lacki...
| Main Authors: | , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2020-04-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | https://www.atmos-chem-phys.net/20/3931/2020/acp-20-3931-2020.pdf |
| _version_ | 1828842655991201792 |
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| author | Q. Liu Q. Liu D. Liu Q. Gao Q. Gao P. Tian P. Tian F. Wang D. Zhao K. Bi Y. Wu S. Ding K. Hu J. Zhang D. Ding C. Zhao |
| author_facet | Q. Liu Q. Liu D. Liu Q. Gao Q. Gao P. Tian P. Tian F. Wang D. Zhao K. Bi Y. Wu S. Ding K. Hu J. Zhang D. Ding C. Zhao |
| author_sort | Q. Liu |
| collection | DOAJ |
| description | <p>The water uptake of aerosol influences its optical depth and capacity for
cloud formation, depending on the vertical profile of aerosol hygroscopicity
because of different solar radiation received and supersaturation (SS) conditions
at different atmospheric levels. Such information is lacking over the polluted
East Asian region. This study presents aircraft-based in situ measured aerosol
size distributions and chemical compositions by a series of flights over
the Beijing area in wintertime. Under high relative humidity (hRH) conditions (surface
RH > 60 %), a significant enhancement of aerosol
hygroscopicity parameter (<span class="inline-formula"><i>κ</i></span>) in the planetary boundary layer (PBL)
was observed to increase by 50 % from 0.20 up to 0.34 from the surface to
the top of the PBL (vertical gradient of <span class="inline-formula">∼0.13</span> km<span class="inline-formula"><sup>−1</sup></span>), along
with the dry particle effective diameter (<span class="inline-formula"><i>D</i><sub>eff</sub></span>) being increased by
71 % and activation ratio up to 0.23 (0.64) at SS <span class="inline-formula">=0.05 <i>%</i></span> (0.1 %).
However, a lower vertical gradient of <span class="inline-formula"><i>κ</i></span> (0.05 km<span class="inline-formula"><sup>−1</sup></span>) and smaller
<span class="inline-formula"><i>D</i><sub>eff</sub></span> was exhibited under low RH (lRH, surface RH < 60 %). This
suggests that the aqueous processes played an important role in promoting the
enhancement of particle hygroscopicity in the PBL. The <span class="inline-formula"><i>κ</i></span> in the
lower free troposphere (LFT) was relatively stable at <span class="inline-formula">0.24±0.03</span> with
a slight increase during regional transport. The enhancement of aerosol
optical depth (AOD) due to water uptake ranged 1.0–1.22 for the PBL under lRH
and LFT, but it reached as high as 6.4 in the PBL under hRH. About 80 % and
18 % of the AOD were contributed to by aerosol hygroscopic growth under hRH
and lRH, respectively. These results emphasize the important evolution of
aerosol water-uptake capacity in the PBL, especially under the high RH
condition.</p> |
| first_indexed | 2024-12-12T20:29:07Z |
| format | Article |
| id | doaj.art-abdf39915563465c9c7018ac23c66444 |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-12-12T20:29:07Z |
| publishDate | 2020-04-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-abdf39915563465c9c7018ac23c664442022-12-22T00:13:04ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242020-04-01203931394410.5194/acp-20-3931-2020Vertical characteristics of aerosol hygroscopicity and impacts on optical properties over the North China Plain during winterQ. Liu0Q. Liu1D. Liu2Q. Gao3Q. Gao4P. Tian5P. Tian6F. Wang7D. Zhao8K. Bi9Y. Wu10S. Ding11K. Hu12J. Zhang13D. Ding14C. Zhao15Beijing Weather Modification Office, Beijing 100089, ChinaInstitute of Urban Meteorology, Chinese Meteorological Administration, Beijing 100089, ChinaDepartment of Atmospheric Sciences, School of Earth Sciences, Zhejiang University, Hangzhou, Zhejiang, 310027, ChinaBeijing Weather Modification Office, Beijing 100089, ChinaBeijing Key Laboratory of Cloud, Precipitation and Atmospheric Water Resources, Beijing, 100089, ChinaBeijing Key Laboratory of Cloud, Precipitation and Atmospheric Water Resources, Beijing, 100089, ChinaField Experiment Base of Cloud and Precipitation Research in North China, China Meteorological Administration, Beijing, 101200, ChinaBeijing Weather Modification Office, Beijing 100089, ChinaBeijing Weather Modification Office, Beijing 100089, ChinaBeijing Weather Modification Office, Beijing 100089, ChinaDepartment of Atmospheric Sciences, School of Earth Sciences, Zhejiang University, Hangzhou, Zhejiang, 310027, ChinaDepartment of Atmospheric Sciences, School of Earth Sciences, Zhejiang University, Hangzhou, Zhejiang, 310027, ChinaDepartment of Atmospheric Sciences, School of Earth Sciences, Zhejiang University, Hangzhou, Zhejiang, 310027, ChinaDepartment of Atmospheric Sciences, School of Earth Sciences, Zhejiang University, Hangzhou, Zhejiang, 310027, ChinaBeijing Weather Modification Office, Beijing 100089, ChinaDepartment of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing 100871, China<p>The water uptake of aerosol influences its optical depth and capacity for cloud formation, depending on the vertical profile of aerosol hygroscopicity because of different solar radiation received and supersaturation (SS) conditions at different atmospheric levels. Such information is lacking over the polluted East Asian region. This study presents aircraft-based in situ measured aerosol size distributions and chemical compositions by a series of flights over the Beijing area in wintertime. Under high relative humidity (hRH) conditions (surface RH > 60 %), a significant enhancement of aerosol hygroscopicity parameter (<span class="inline-formula"><i>κ</i></span>) in the planetary boundary layer (PBL) was observed to increase by 50 % from 0.20 up to 0.34 from the surface to the top of the PBL (vertical gradient of <span class="inline-formula">∼0.13</span> km<span class="inline-formula"><sup>−1</sup></span>), along with the dry particle effective diameter (<span class="inline-formula"><i>D</i><sub>eff</sub></span>) being increased by 71 % and activation ratio up to 0.23 (0.64) at SS <span class="inline-formula">=0.05 <i>%</i></span> (0.1 %). However, a lower vertical gradient of <span class="inline-formula"><i>κ</i></span> (0.05 km<span class="inline-formula"><sup>−1</sup></span>) and smaller <span class="inline-formula"><i>D</i><sub>eff</sub></span> was exhibited under low RH (lRH, surface RH < 60 %). This suggests that the aqueous processes played an important role in promoting the enhancement of particle hygroscopicity in the PBL. The <span class="inline-formula"><i>κ</i></span> in the lower free troposphere (LFT) was relatively stable at <span class="inline-formula">0.24±0.03</span> with a slight increase during regional transport. The enhancement of aerosol optical depth (AOD) due to water uptake ranged 1.0–1.22 for the PBL under lRH and LFT, but it reached as high as 6.4 in the PBL under hRH. About 80 % and 18 % of the AOD were contributed to by aerosol hygroscopic growth under hRH and lRH, respectively. These results emphasize the important evolution of aerosol water-uptake capacity in the PBL, especially under the high RH condition.</p>https://www.atmos-chem-phys.net/20/3931/2020/acp-20-3931-2020.pdf |
| spellingShingle | Q. Liu Q. Liu D. Liu Q. Gao Q. Gao P. Tian P. Tian F. Wang D. Zhao K. Bi Y. Wu S. Ding K. Hu J. Zhang D. Ding C. Zhao Vertical characteristics of aerosol hygroscopicity and impacts on optical properties over the North China Plain during winter Atmospheric Chemistry and Physics |
| title | Vertical characteristics of aerosol hygroscopicity and impacts on optical properties over the North China Plain during winter |
| title_full | Vertical characteristics of aerosol hygroscopicity and impacts on optical properties over the North China Plain during winter |
| title_fullStr | Vertical characteristics of aerosol hygroscopicity and impacts on optical properties over the North China Plain during winter |
| title_full_unstemmed | Vertical characteristics of aerosol hygroscopicity and impacts on optical properties over the North China Plain during winter |
| title_short | Vertical characteristics of aerosol hygroscopicity and impacts on optical properties over the North China Plain during winter |
| title_sort | vertical characteristics of aerosol hygroscopicity and impacts on optical properties over the north china plain during winter |
| url | https://www.atmos-chem-phys.net/20/3931/2020/acp-20-3931-2020.pdf |
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