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首页> 外文期刊>Atmospheric chemistry and physics >Spatial and temporal variations of the concentrations of PM10, PM2.5 and PM1 in China
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Spatial and temporal variations of the concentrations of PM10, PM2.5 and PM1 in China

机译：中国PM10，PM2.5和PM1浓度的时空变化

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摘要

Concentrations of PM10, PM2.5 and PM1 were monitored at 24 CAWNET (China Atmosphere Watch Network) stations from 2006 to 2014. The highest particulate matter (PM) concentrations were observed at the stations of Xian, Zhengzhou and Gucheng, on the Guanzhong Plain and the Huabei Plain (HBP). The second highest PM concentrations were observed in northeast China, followed by southern China. According to the latest air quality standards of China, 14 stations reached the PM10 standard, and only 7 stations, mainly rural and remote stations, reached the PM2.5 standard. The ratios of PM2.5 to PM10 showed a clear increasing trend from northern to southern China, because of the substantial contribution of coarse mineral aerosol in northern China. The ratios of PM1 to PM2.5 were higher than 80% at most stations. PM concentrations tended to be highest in winter and lowest in summer at most stations, and mineral dust influenced the results in spring. A decreasing interannual trend was observed on the HBP and in southern China for the period 2006 to 2014, but an increasing trend occurred at some stations in northeast China. Bimodal and unimodal diurnal variation patterns were identified at urban stations. Both emissions and meteorological variations dominate the long-term PM concentration trend, while meteorological factors play a leading role in the short term.
机译：从2006年至2014年，在24个CAWNET（中国大气监视网）站监测了PM10，PM2.5和PM1的浓度。在关中平原的西安，郑州和古城站观测到了最高的颗粒物（PM）浓度。和华北平原（HBP）。在中国东北发现第二高的PM浓度，其次是中国南部。根据中国最新的空气质量标准，有14个站点达到了PM10标准，只有7个站点（主要是农村和边远站点）达到了PM2.5标准。从华北到华南，PM2.5与PM10的比例呈现明显的上升趋势，这是因为华北地区粗矿物气溶胶的贡献很大。在大多数站点中，PM1与PM2.5的比率均高于80％。在大多数站点中，PM浓度往往在冬季最高，而在夏季最低。春季，矿物粉尘影响了结果。在2006年至2014年期间，HBP和华南地区的年际趋势呈下降趋势，但东北地区的某些站点出现了上升趋势。在城市站确定了双峰和单峰日变化模式。排放和气象变化都主导了长期的PM浓度趋势，而气象因素在短期内起着主导作用。

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