Different contributions of Arctic sea ice anomalies from different regions to North China summer ozone pollution

Surface ozone pollution is the main form of summer air pollution in North China and damages human and ecosystem health. Long‐term meteorological observations show that late spring Arctic sea ice and ozone‐related meteorological conditions are positively correlated; this result was further verified by numerical experiments. The Eurasia teleconnection pattern bridged the sea ice over Gakkel Ridge to the local meteorological conditions associated with O3. The sea ice anomalies over the Canada Basin and the Beaufort Sea mainly influenced the O3 pollution in North China via the summer west Pacific pattern. Furthermore, changes in the relationships were also included. The anticyclonic circulation over North China, that is, the joint centre of the Eurasia teleconnection and west Pacific patterns, could significantly lead to suitable weather conditions to accelerate the photochemical reactions to transfer the precursors to surface ozone. This finding helps to improve the understanding of the interannual variation in ozone pollution in North China. (a) Histogram of JJA mean MDA8 (red solid), OWI (black hollow), 10‐m meridional wind (red hollow), DT (blue hollow), and boundary layer height (green hollow) from 2015 to 2017. (b) Scatter diagram of MDA8 and daily precipitation.