Assessment of meteorology vs. control measures in the China fine particular matter trend from 2013 to 2019 by an environmental meteorology index
<p>A framework was developed to quantitatively assess the contribution of meteorology variations to the trend of fine particular matter (PM<span class="inline-formula"><sub>2.5</sub></span>) concentrations and to separate the impacts of meteorology from the co...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2021-03-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | https://acp.copernicus.org/articles/21/2999/2021/acp-21-2999-2021.pdf |
| Summary: | <p>A framework was developed to quantitatively assess the contribution of
meteorology variations to the trend of fine particular matter (PM<span class="inline-formula"><sub>2.5</sub></span>)
concentrations and to separate the impacts of meteorology from the control
measures in the trend, based upon the Environmental Meteorology Index (EMI). The model-based EMI realistically reflects the role of meteorology in the trend of PM<span class="inline-formula"><sub>2.5</sub></span> and is explicitly attributed to three major factors: deposition, vertical accumulation and horizontal transports. Based
on the 2013–2019 PM<span class="inline-formula"><sub>2.5</sub></span> observation data and re-analysis meteorological
data in China, the contributions of meteorology and control measures in nine
regions of China were assessed separately by the EMI-based framework.
Monitoring network observations show that the PM<span class="inline-formula"><sub>2.5</sub></span> concentrations have
declined by about 50 % on the national average and by about 35 % to 53 % for various regions. It is found that the nationwide emission control
measures were the dominant factor in the declining trend of China PM<span class="inline-formula"><sub>2.5</sub></span>
concentrations, contributing about 47 % of the PM<span class="inline-formula"><sub>2.5</sub></span> decrease from 2013 to 2019 on the national average and 32 % to 52 % for
various regions. The meteorology has a variable and sometimes critical
contribution to the year-by-year variations of PM<span class="inline-formula"><sub>2.5</sub></span> concentrations,
5 % on the annual average and 10 %–20 % for the fall–winter heavy pollution seasons.</p> |
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| ISSN: | 1680-7316 1680-7324 |