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The relationship between the emission of ozone precursors and the chemical production of tropospheric ozone(O3) in the Pearl River Delta Region(PRD) was studied using numerical simulation.The aim of this study was to examine the volatile organic compound(VOC)-or nitrogen oxide(NOx =NO+NO2)limited conditions at present and when surface temperature is increasing due to global warming,thus to make recommendations for future ozone abatement policies for the PRD region.The model used for this application is the U.S.Environmental Protection Agency’s(EPA’s) third-generation air-quality modeling system;it consists of the mesoscale meteorological model MM5 and the chemical transport model named Community Multi-scale Air Quality(CMAQ).A series of sensitivity tests were conducted to assess the influence of VOC and NOx variations on ozone production.Tropical cyclone was shown to be one of the important synoptic weather patterns leading to ozone pollution.The simulations were based on a tropicalcyclone-related episode that occurred during 14-16 September 2004.The results show that,in the future,the control strategy for emissions should be tightened.To reduce the current level of ozone to meet the Hong Kong Environmental Protection Department(EPD) air-quality objective(hourly average of 120 ppb),emphasis should be put on restricting the increase of NOx emissions.Furthermore,for a wide range of possible changes in precursor emissions,temperature increase will increase the ozone peak in the PRD region;the areas affected by photochemical smog are growing wider,but the locations of the ozone plume are rather invariant. 相似文献
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土地利用城市化对珠三角炎热天气的影响. 总被引：1，自引：0，他引：1
土地利用类型的变化对MM5模拟结果的准确性有着重要的影响。不同的土地利用类型,有着不同的地表粗糙度,反照率,热容量,有效湿度等,从而产生不同的模拟地面热通量及地面水汽通量,并通过垂直方向的湍流输送,影响到高空气象场的模拟结果。利用2001年卫星遥感土地类型等数据,对MM5系统旧的24类全球土地利用数据在珠三角区域进行了更新;通过把珠三角地区的土地利用设为常绿阔叶林和城市两种不同类型的敏感性模拟测试,可以看到土地利用的变化,对温度、风场等气象场的模拟结果影响较大;通过1993年和2001年土地利用情况下的模拟气象场及与观测数据的对比分析可以知道,采用新的土地利用类型可以较好地改进MM5气象场模拟结果的准确性,土地利用的城市化趋势会造成城市密集地区地表温度升高,水汽混合率降低。 相似文献
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