首页|Influence of circulation types on temporal and spatial variations of ozone in Beijing
Influence of circulation types on temporal and spatial variations of ozone in Beijing
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NETL
NSTL
万方数据
维普
This study analyzes the impact of circulation types(CTs)on ozone(O3)pollution in Bei-jing.The easterly high-pressure(SWW)circulation occurred most frequently(30％;276 day),followed by northwesterly high-pressure(AN)circulation(24.3％;224 day).The SWW type had the highest O3 anomaly of+17.28 pg/m3,which was caused by excellent photochemi-cal reactions,poor diffusion ability and regional transport.Due to the higher humidity and precipitation in the low-pressure type(C),the O3 increase(+8.02 pg/m3)was less than that in the SWW type.Good diffusion/wet deposition and weak formation ability contributed to O3 decrease in AN(-12.54 pg/m3)and northerly high-pressure(ESN)CTs(-12.26 pg/m3).The intra-area transport of O3 was significant in polluted circulations(SWW-and C-CTs).In addi-tion,higher temperature,radiation and less rainfall also contributed to higher O3 in north-ern Beijing under the SWW type.For the clean CTs(AN and ESN CTs),precursor amount and intra-area transport played a dominant role in O3 distribution.Under the northeast-erly low-pressure CT,better formation conditions and higher precursor amount combined with the intra-area southerly transport to cause higher O3 values in the south than in the north.The higher O3 in the northwestern area under the northeasterly high-pressure type was influenced by weaker titration loss and high O3 concentration in previous day.Annual variation in the CTs contributed up to 86.1％of the annual variation in O3.About 78％-83％of the diurnal variation in O3 resulted from local meteorological factors.
OzoneObjective synoptic classificationTemporal variation and spatialdistributionIntra-area transport
State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry(LAPC),Chinese Academy of Sciences,Institute of Atmospheric Physics,Beijing 100029,China
北京市自然科学基金国家重点研发计划国家自然科学基金国家自然科学基金Beijing Nova Program
NETL
NSTL
万方数据
维普
