Quasi-weekly oscillation of regional PM<sub>2.5</sub> transport over China driven by the synoptic-scale disturbance of the East Asian winter monsoon circulation
<p>Regional PM<span class="inline-formula"><sub>2.5</sub></span> transport is an important cause of atmospheric environment change. However, the variations in regional PM<span class="inline-formula"><sub>2.5</sub></span> trans...
Saved in:
| Main Authors: | , , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2025-01-01
|
| Series: | Atmospheric Chemistry and Physics |
| Online Access: | https://acp.copernicus.org/articles/25/1273/2025/acp-25-1273-2025.pdf |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | <p>Regional PM<span class="inline-formula"><sub>2.5</sub></span> transport is an important cause of atmospheric environment change. However, the variations in regional PM<span class="inline-formula"><sub>2.5</sub></span> transport on a synoptic scale with meteorological drivers have been incomprehensively understood. Therefore, this study is targeted at the quasi-weekly oscillation (QWO) of regional PM<span class="inline-formula"><sub>2.5</sub></span> transport over central and eastern China (CEC) with the influence of synoptic-scale disturbance of the East Asian winter monsoon (EAWM) circulation. By constructing the data of daily PM<span class="inline-formula"><sub>2.5</sub></span> transport flux in CEC in the winters of 2015–2019, we utilize the extended empirical orthogonal function (EEOF) decomposition and other statistical methods to extract the moving spatial distribution of regional PM<span class="inline-formula"><sub>2.5</sub></span> transport over CEC, recognizing the QWO in regional PM<span class="inline-formula"><sub>2.5</sub></span> transport with the spatial–temporal variations over CEC. The source–receptor relationship in regional transport of PM<span class="inline-formula"><sub>2.5</sub></span> is identified with the 2 d lag effect of the North China Plain, as the upwind source region, on the PM<span class="inline-formula"><sub>2.5</sub></span> pollution change in the Twain-Hu Basin, as the downwind receptor region in central China. The QWO of regional PM<span class="inline-formula"><sub>2.5</sub></span> transport over CEC is regulated by the synoptic-scale disturbance of the EAWM circulation with the periodic activities of the Siberian high. These findings provide new insights into the understanding of regional PM<span class="inline-formula"><sub>2.5</sub></span> transport with the source–receptor relationship and the meteorological mechanism in atmospheric environment change.</p> |
|---|---|
| ISSN: | 1680-7316 1680-7324 |