Abstract
Abstract. Ground-level observations, reanalyzed meteorological
fields and a 3-D global chemical and transport model (GEOS-Chem) were
applied in this study to investigate ozone (O3) pollution events (OPEs)
in North China (36.5–40.5∘ N, 114.5–119.5∘ E) during 2014–2017. Ozone pollution days (OPDs) were
defined as days with maximum daily averaged 8 h (MDA8) concentrations over
North China larger than 160 µg m−3, and OPEs were defined as
periods with 3 or more consecutive OPDs. Observations showed that there were
167 OPDs and 27 OPEs in North China during 2014–2017, in which 123 OPDs and
21 OPEs occurred from May to July. We found that OPEs in North China occurred
under a typical weather pattern with high daily maximum temperature (Tmax),
low relative humidity (RH), anomalous southerlies and divergence in the
lower troposphere, an anomalous high-pressure system at 500 hPa, and an
anomalous downward air flow from 500 hPa to the surface. Under such a
weather pattern, chemical production of O3 was high between 800 and 900 hPa, which was then transported downward to enhance O3 pollution at the
surface. A standardized index I_OPE was defined by applying
four key meteorological parameters, including Tmax, RH, meridional winds at
850 hPa (V850) and zonal winds at 500 hPa (U500). I_OPE can
capture approximately 80 % of the observed OPDs and OPEs, which has
implications for forecasting OPEs in North China.
Funder
National Natural Science Foundation of China
Cited by
91 articles.
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