降水
相对湿度
质量浓度(化学)
湿度
环境科学
长江
强度(物理)
大气科学
气团(太阳能)
水文学(农业)
地理
气象学
化学
物理
中国
地质学
物理化学
岩土工程
考古
边界层
热力学
量子力学
作者
Yue Zhou,Yanyu Yue,Yongqing Bai,Liwen Zhang
摘要
Based on the PM 2.5 and PM 10 mass concentration data obtained from 51 national air quality monitoring stations and the corresponding rainfall intensity data in automatic meteorological stations in Hubei Province from 1 January 2015 to 31 December 2017, the impact of rainfall intensity on PM mass concentrations under relatively different humidity conditions was analyzed. The results showed that light rain occurred most frequently in the pollution process, with Xiangyang being affected for up to 587 h. PM concentration would not change drastically under the effect of precipitation. Mean rainfall intensity responsible for wet growth of PM 10 and PM 2.5 was mainly <0.5 mm/h, while that responsible for wet removal of PM 2.5 was significantly higher (>1.4 mm/h) than that of PM 10 (>1.0 mm/h). Precipitation was more likely to produce a wet removal effect for a greater initial value of PM mass concentration, and on the contrary, a wet growth effect was more likely, with the threshold of PM 10 mass concentration being 150 μ g/m 3 and that of PM 2.5 mass concentration being 95 μ g/m 3 . Wet removal played a leading role in lower humidity (∼60%) and greater rainfall intensity, but wet growth played a leading role in higher humidity (∼90%) and lower rainfall intensity. As the precipitation level increased (rainfall ≥1.5 mm·h −1 ), the wet removal to PM 10 mass concentration was enhanced more obviously. The variations of PM 2.5 had similar distributions to those of PM 10 under the effect of precipitation, but the wet removal effect of precipitation was weakened and the wet growth effect was enhanced.
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