Links of climate variability in Arctic sea ice, Eurasian teleconnection pattern and summer surface ozone pollution in North China
2019
Abstract. Summer surface O 3 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 µ g m −3 in North
China. Based on the close relationships between the O 3
concentration and the meteorological conditions, a daily surface O 3
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 O 3 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 O 3 . The associated southerlies over North China transported
surrounding O 3 precursors to superpose local emissions. Increased
solar radiation and high temperatures during the positive EU phase
dramatically enhanced O 3 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
O 3 -related weather conditions was attributed to Arctic sea ice to
the north of Eurasia. This finding will aid in understanding the interannual
variation in O 3 pollution, specifically the related meteorological
conditions.
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