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            SPATIOTEMPORAL VARIATION OF NO_2 AND SUB-REGIONAL TRANSPORT DURING WINTER POLLUTION EVENTS IN HAIKOU, CHINA

            符传博  丹利  唐家翔  杨薇  
            【摘要】:An ensemble of satellite measurements, statistic data from government and meteorological diagnosis in regional background site(Haikou, China) has revealed the spatial and temporal characteristics of NO_2 and associated synoptic transport patterns over southern China from January 2013 to February 2014. The result are as follows.(1)Ozone Monitoring Instrument(OMI) satellite products have a good correlation with observation NO_2 in Haikou. The correlation coefficients between Observation NO_2 and tropospheric column NO_2 and ratio of Tro NO_2/Tot NO_2(tropospheric column NO_2/total column NO_2) have all passed the confidence level of 99.9% test.(2) Tro NO_2 over southern China has an obvious seasonal variation, which is closely coupled with regional meteorology in each season.(3) NO_2 concentration in Haikou revealed three pollution periods during December 2013 and January 2014. The variation of NO_2 concentration in Haikou is related to the meteorological elements closely.(4) Compared to the monthly mean meteorological fields of the pollution periods, the results indicate that NO_2 pollution event in Haikou is directly related to the exogenous transportation from PRD region. An ensemble analysis of meteorological dynamic factors,wind vectors and backward trajectories during the pollution periods further verifies this conclusion.
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