Links of climate variability in Arctic sea ice, Eurasian teleconnection pattern and summer surface ozone pollution in North China
<p>Summer surface <span class="inline-formula">O<sub>3</sub></span> pollution has rapidly intensified in China in the recent decade, damaging human and ecosystem health. In 2017, the summer mean maximum daily average 8 h concentration of ozone was g...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2019-03-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | https://www.atmos-chem-phys.net/19/3857/2019/acp-19-3857-2019.pdf |
| Summary: | <p>Summer surface <span class="inline-formula">O<sub>3</sub></span> pollution has rapidly
intensified in China in the recent decade, damaging human and ecosystem
health. In 2017, the summer mean maximum daily average 8 h concentration of
ozone was greater than 150 <span class="inline-formula">µ</span>g m<span class="inline-formula"><sup>−3</sup></span> in North
China. Based on the close relationships between the <span class="inline-formula">O<sub>3</sub></span>
concentration and the meteorological conditions, a daily surface <span class="inline-formula">O<sub>3</sub></span>
weather index was constructed, which extends the study period to the
historical period before 2007 and the projected future. Here, we show that in
addition to anthropogenic emissions, the Eurasian teleconnection
pattern (EU), a major globally atmospheric teleconnection pattern, influences
surface <span class="inline-formula">O<sub>3</sub></span> pollution in North China on a timescale of climate. The
local meteorological conditions associated with the EU positive phase
supported intense and efficient photochemical reactions to produce more
surface <span class="inline-formula">O<sub>3</sub></span>. The associated southerlies over North China transported
surrounding <span class="inline-formula">O<sub>3</sub></span> precursors to superpose local emissions. Increased
solar radiation and high temperatures during the positive EU phase
dramatically enhanced <span class="inline-formula">O<sub>3</sub></span> production. Furthermore, due to the close
connection between the preceding May Arctic sea ice (SI) and summer EU
pattern, approximately 60 % of the interannual variability in
<span class="inline-formula">O<sub>3</sub></span>-related weather conditions was attributed to Arctic sea ice to
the north of Eurasia. This finding will aid in understanding the interannual
variation in <span class="inline-formula">O<sub>3</sub></span> pollution, specifically the related meteorological
conditions.</p> |
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| ISSN: | 1680-7316 1680-7324 |