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- W2011059993 abstract "Abstract Collecting the cloud-to-ground (CG) lightning flash data from Tai-Power Company of Taiwan, a long term study has been performed to investigate the enhancement of lightning activity in and around Taipei City, the largest metropolitan city of Taiwan, in relation to urbanization, for the period of 2005–2010. Results reveal that negative flash density is enhanced by approximately 64% while the positive flash density is enhanced by 48%, over and downwind of the city compared with other neighboring areas. On the other hand a decrease of nearly 24% in the percentage of positive flashes occurs over and downwind of Taipei compared to upwind values. We have also investigated the effect of urbanization on peak current of both polarities but no significant effect is noticed. Possible influence of urban particulate matter on the enhancement of CG lightning activity has been analyzed utilizing the annual averages of PM10 (particulate matter with aerodynamic diameter smaller than 10 μm) and SO 2 (sulfur dioxide) concentrations data. Interesting results are found, indicating the higher concentrations of PM10 and SO 2 contributes to the CG lightning enhancement. Both the concentrations exhibit a positive linear correlation with the percent change in CG flashes from the upwind to the urban area and from the upwind to the downwind area. However, the correlation coefficient for PM10 concentrations is comparatively much lower than SO 2 concentrations. Positive correlations of 0.55 and 0.68 are found for the PM10 and SO 2 concentrations, respectively, when compared separately with the percent change in CG flashes from the upwind to the downwind area, indicating the influence of aerosols on urban CG lightning enhancement. Hourly variation of lightning flashes show that the urban effects on CG lightning is prominent in the afternoon and early evening hours. The results obtained from the present analysis corroborate the results reported in the literature by other researchers." @default.
- W2011059993 created "2016-06-24" @default.
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- W2011059993 date "2014-10-01" @default.
- W2011059993 modified "2023-10-03" @default.
- W2011059993 title "Enhancement of cloud-to-ground lightning activity over Taipei, Taiwan in relation to urbanization" @default.
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- W2011059993 doi "https://doi.org/10.1016/j.atmosres.2014.05.017" @default.
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