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| 春季一次典型沙尘天气对南京市空气质量影响研究 |
| Study on Air Quality Impacted by a Typical Dust Weather in the Spring of Nanjing |
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| DOI： |
| 中文关键词: 沙尘 PM10 PM2.5 水溶性离子 消光系数 退偏振比 南京 |
| 英文关键词: Dust PM10 PM2.5 Water soluble ions Extinction coefficient Depolarization ratio Nanjing |
| 基金项目:国家科技支撑计划基金资助项目（2014BAC22B04）；国家自然科学重大研究计划基金资助项目（D0512/91544231） |
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| 中文摘要: |
| 2016年5月6日—8日南京市经历了一次由沙尘影响的重污染过程，在此期间对南京城区的PM10、PM2.5和PM2.5化学组分、消光系数、退偏振比等参数进行连续观测，结合HYSPLIT后向轨迹模拟对此次过程作相关分析。结果表明：此次沙尘为典型的北方传输影响，传输方向为西北至东南，受其影响南京市空气质量一度达到重度污染；PM2.5中Ca2+平均质量浓度达1.52 μg/m3，高出沙尘过境后2.45倍；近地面至高空1.2 km范围内消光系数值约0.4 km-1，退偏振比值达0.4左右，沙尘造成近地面PM10和PM2.5质量浓度均有升高。 |
| 英文摘要: |
| From 6th to 8th of May 2016, Nanjing suffered a severe air pollution impacted by a dust storm. According to continuous monitoring of the chemical components in PM2.5, PM2.5 and PM10, the extinction coefficient and polarization ratio, and by HYSPLIT backward trajectory simulation analysis, it was concluded that this air pollution process was a typical dust transportation from the northwest to the southeast. The average concentration of Ca2+ in PM2.5 was 1.52 μg/m3, which was 2.45 times higher than that after the storm. The extinction coefficient was about 0.4 km-1 from near the ground to 1.2 km altitude, the depolarization ratio reached to 0.4. The concentration of PM10 and PM2.5 near the ground both went up by the dust storm. |
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