Measurement report: On the contribution of long-distance transport to the secondary aerosol formation and aging
<p>To investigate the physio-chemical properties of aerosol transported from major pollution regions in China, observations were conducted <span class="inline-formula">∼</span> 200 m above the ground at the junction location of the North China Plain and Fenwei Basin, whic...
| Main Authors: | , , , , , , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2022-07-01
|
| Series: | Atmospheric Chemistry and Physics |
| Online Access: | https://acp.copernicus.org/articles/22/9513/2022/acp-22-9513-2022.pdf |
| Summary: | <p>To investigate the physio-chemical properties of aerosol transported from
major pollution regions in China, observations were conducted
<span class="inline-formula">∼</span> 200 m above the ground at the junction location of the North
China Plain and Fenwei Basin, which are two regions of top priority for
China's Blue Sky Campaign. We identified three pollution transport sectors
including those from Beijing–Tianjin–Hebei (BTH), urban Guanzhong Basin
(GZB) and northern China and one clean transport sector from the rural Guanzhong
Basin region. Secondary inorganic aerosol (SIA) constituted a major fraction (39 %–46 %) in all pollution transport sectors, with a high sulfur oxidation
ratio (0.44–0.58) and a high nitrogen oxidation ratio (0.24–0.29), suggesting
efficient formation of secondary inorganic aerosol during regional
transport. More oxidized oxygenated organic aerosol (MO-OOA) played a
dominant role in the source of organic aerosol in all sectors including the
clean one, accounting for 42 %–58 % of total organic aerosol. Elemental
analysis (O and C) shows that aerosol particles at this receptor site were
much more oxidized than in urban regions, pointing that long-range transport
contributed markedly to the organic aerosol oxidation and aging. Case
studies of pollution events with high sulfate, nitrate and more-oxidized
oxygenated organic aerosol production rate indicate the strong formation
efficiency of secondary aerosol during regional transport in the
Beijing–Tianjin–Hebei transport sector.</p> |
|---|---|
| ISSN: | 1680-7316 1680-7324 |