| 不同强度降雨过程对东莞PM2．5质量浓度的影响 |
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| 引用本文： | 袁志扬.不同强度降雨过程对东莞PM2．5质量浓度的影响[J].广东气象,2014(5):32-35. |
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| 作者姓名： | 袁志扬 |
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| 作者单位： | 广东省东莞市气象局; |
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| 摘 要： | 通过统计2012—2013年东莞市观测到的629次降雨过程和对应的PM2．5质量浓度降雨前后的变化，分析每次降雨过程的雨量级、时间、强度与PM2．5质量浓度净化大小的关系。结果表明：虽然降雨有助于PM2．5沉降，缓解空气污染，但由于每次降雨过程的雨量、降雨时长、强度不同，降雨前的PM2．5质量浓度不同，雨滴、雾滴的影响，局部性降雨的影响，雨滴大小、数密度以及其它气象要素的影响，导致每次降水过程不是都能削减PM2．5质量浓度，起净化作用，净化的程度也不一样；从平均净化能力来说，雨量级越大、降雨时长越长，雨强越强的降雨过程对PM2．5质量浓度削减的能力越强，净化效果越显著。
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| 关 键 词： | PM2.5 质量浓度 降雨 东莞 |
The Effect of Rains of Different Intensity on Mass Concentration of PM2.5 in Dongguan City |
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| YUAN Zhi-yang.The Effect of Rains of Different Intensity on Mass Concentration of PM2.5 in Dongguan City[J].Journal of Guangdong Meteorology,2014(5):32-35. |
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| Authors: | YUAN Zhi-yang |
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| Institution: | YUAN Zhi-yang ( Meteorological Bureau of Dongguan City, Dongguan 523086) |
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| Abstract: | By statistically studying the 629 rain processes observed at Dongguan City from 2012 to 2013 and their corresponding changes in the mass concentration of PM2.5 before and after the rain, the relationship is studied between the level of rainfall amount, time and intensity of each of the rains and the reduction of PM2.5 mass concentration （MC）. The results are shown as follows. Although the rain is helpful in suppress- ing PM2.5 and relieving air pollution, the PM2.5 MC is not always reduced and the air is not always cleansed or by the same degree, due to the difference in the amount, duration and intensity of individual rain proces- ses as well as the effect of different PM2.5 MC prior to the rain, raindrop and fog droplet, locality of the rain, size of the raindrop, count density and other meteorological elements. For the mean cleansing capability, the larger the level of rainfall amount, the longer the rain process and the higher the rainrate, the more powerful the cleansing capability and effect for PM2.5 MC will be. |
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| Keywords: | applied meteorology mass concentration of PM2 5 rainfall Dongguan City |
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