| 2019年秋季海南省4次臭氧污染过程特征及潜在源区分析 |
| 摘要点击 1630 全文点击 1344 投稿时间：2022-01-22 修订日期：2022-03-08 |
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| 中文关键词 臭氧(O3) 后向轨迹 潜在源贡献因子(PSCF) 浓度权重轨迹(CWT) 海南 |
| 英文关键词 ozone (O3) back trajectory potential source contribution factor (PSCF) concentration weight trajectory (CWT) Hainan |
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| 中文摘要 |
| 基于2019年秋季海南省空气质量和气象监测数据，结合相关分析、HYSPLIT后向轨迹模型、PSCF （潜在源贡献因子）和CWT （浓度权重轨迹）等分析方法对海南省4次O3污染过程特征及潜在源区进行深入分析.结果表明：①过程1和过程3分别发生在9月21~30日和11月3~11日，持续时间达到了10 d和9 d，ρ（O3-8h）（最大8 h平均）分别为145.52 μg ·m-3和143.55 μg ·m-3.过程2和过程4出现在10月18~21日和11月20~25日，持续时间为4 d和6 d，ρ（O3-8h）分别为130.79 μg ·m-3和115.46 μg ·m-3.②气压偏高，降水偏少，相对湿度偏低，日照时数偏长和太阳辐射偏强，是造成海南省出现O3污染天气的有利气象条件.偏北风风场控制下有利于O3-8h浓度上升，不同风速大小会影响海南省O3-8h浓度高值区分布.③ O3污染较为严重的过程1和过程3的影响气流发散度较大，有来自内陆地区和东南沿海地区两支气流，而O3污染较轻的过程2和过程4的影响气流较为集中，多为东南沿海气流.④潜在贡献源区分析表明，浙江省、江西省、福建省和广东省等地是2019年秋季海南省O3污染外源输送的主要源区，其中珠三角地区和广东省西部WPSCF值和WCWT值分别为大于0.36和大于90 μg ·m-3. |
| 英文摘要 |
| Based on the air quality and meteorological monitoring data of Hainan province in autumn of 2019, this study analyzed the characteristics and potential sources for the four O3 polluted processes in Hainan province, using the methods of correlation analysis, HYSPLIT backward trajectory modeling, PSCF (potential source contribution function), and CWT (concentration weighted-trajectory). The results showed that ① the average concentrations of the maximum 8h average (O3-8h) for process 1 and process 3, which occurred from September 21st to 30th and November 3rd to 11th with the durations of 10 d and 9 d, were 145.52 μg·m-3 and 143.55 μg·m-3, respectively. Process 2 and process 4 occurred from October 18th to 21st and November 20th to 25th, with the durations of 4 d and 6 d, and the average concentrations of O3-8h were 130.79 μg·m-3 and 115.46 μg·m-3, respectively. ② High air pressure, low precipitation and relative humidity, long sunshine duration, and strong solar radiation favored the occurrence of O3-polluted weather in Hainan province. Northerly wind was conducive to the increase in O3-8h concentration, and wind speeds affected the regional distribution of high-value areas of O3-8h concentration in Hainan province. ③ Furthermore, process 1 and process 3 with more serious pollution had a larger air flow divergence, and there were two airflows originating from the inland area and the southeast coastal area, respectively. Air flow of process 2 and process 4 was relatively more concentrated with less O3 pollution and was classified as southeast coastal air flow. 4 The analysis of potential contribution sources showed that transport from Zhejiang, Jiangxi, Fujian, and Guangdong provinces were the main sources of O3 pollution in Hainan province in autumn 2019. Among them, the weight potential source contribution function (WPSCF) and weight concentration weighted-trajectory (WCWT) values were larger than 0.36 and 90 μg·m-3 in the PRD (Pearl River Delta) and western Guangdong province regions, respectively. |
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