China's emission control strategies have suppressed unfavorable influences of climate on wintertime PM<sub>2.5</sub> concentrations in Beijing since 2002
<p>Severe wintertime PM<span class="inline-formula"><sub>2.5</sub></span> pollution in Beijing has been receiving increasing worldwide attention, yet the decadal variations remain relatively unexplored. Combining field measurements and model simulations, we qu...
| Main Authors: | , , , , , , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2020-02-01
|
| Series: | Atmospheric Chemistry and Physics |
| Online Access: | https://www.atmos-chem-phys.net/20/1497/2020/acp-20-1497-2020.pdf |
| Summary: | <p>Severe wintertime PM<span class="inline-formula"><sub>2.5</sub></span> pollution in Beijing has been receiving
increasing worldwide attention, yet the decadal variations remain relatively
unexplored. Combining field measurements and model simulations, we
quantified the relative influences of anthropogenic emissions and
meteorological conditions on PM<span class="inline-formula"><sub>2.5</sub></span> concentrations in Beijing over
the winters of 2002–2016. Between the winters of 2011 and 2016, stringent
emission control measures resulted in a 21 % decrease in mean mass
concentrations of PM<span class="inline-formula"><sub>2.5</sub></span> in Beijing, with 7 fewer haze days per winter
on average. Given the overestimation of PM<span class="inline-formula"><sub>2.5</sub></span> by the model, the
effectiveness of stringent emission control measures might have been
slightly overstated. With fixed emissions, meteorological conditions over
the study period would have led to an increase in haze in Beijing, but the
strict emission control measures have suppressed the unfavorable influences
of the recent climate. The unfavorable meteorological conditions are attributed
to the weakening of the East Asia winter monsoon associated particularly
with an increase in pressure associated with the Aleutian Low.</p> |
|---|---|
| ISSN: | 1680-7316 1680-7324 |