The effects of El Niño–Southern Oscillation on the winter haze pollution of China
The effects of El Niño–Southern Oscillation on the winter haze pollution of China
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DOI：
10.5194/acp-18-1863-2018
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发表时间：
2018-02
影响因子：
6.3
通讯作者：
Shuyun Zhao;Hua Zhang;B. Xie
中科院分区：
文献类型：
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作者：
Shuyun Zhao;Hua Zhang;B. Xie
摘要。已有研究报道，厄尔尼诺-南方涛动（ENSO）不仅影响东亚夏季风，而且影响东亚冬季风。这包含了ENSO可能通过影响东亚冬季气候影响中国近几十年来严重的冬季雾霾污染的一些线索。本文通过统计和数值方法探讨了ENSO对中国冬季（12 - 2月）雾霾污染的影响。统计结果表明，在El Nino （La Nina）冬季，中国南方的霾日数有偏少（偏多）的趋势，而中国北部和东部冬季霾日数与ENSO的关系不显著。数值模拟结果还表明，ENSO对中国南方冬季大气人为气溶胶含量的影响比对华北和华东地区的影响更明显。在2010年气溶胶排放水平下，在厄尔尼诺（拉尼娜）冬季，中国南方冬季大气人为气溶胶含量普遍高于（低于）正常水平。这是因为从南亚和东南亚到中国南部的气溶胶运输增强（减弱），这掩盖了厄尔尼诺（拉尼娜）冬季气溶胶清除条件的改善（恶化）。模拟华南地区气溶胶日表面浓度的频率分布表明，在El Nino （La Nina）冬季，该地区的净霾日数和中（重）霾日数较少，而重（中）霾日数较多。
Abstract. It has been reported in previous studies that El Nino–Southern Oscillation (ENSO) influenced not only the summer monsoon, but also the winter monsoon over East Asia. This contains some clues that ENSO may affect the winter haze pollution of China, which has become a serious problem in recent decades, through influencing the winter climate of East Asia. In this work, we explored the effects of ENSO on the winter (from December to February) haze pollution of China statistically and numerically. Statistical results revealed that the haze days of southern China tended to be fewer (more) than normal in El Nino (La Nina) winter, whereas the relationships between the winter haze days of northern and eastern China and ENSO were not significant. Results from numerical simulations also showed that ENSO influenced the winter atmospheric anthropogenic aerosol content over southern China more obviously than it did over northern and eastern China. Under the emission level of aerosols for the year 2010, winter atmospheric anthropogenic aerosol content over southern China was generally greater (less) than normal in El Nino (La Nina) winter. This was because the transport of aerosols from South and Southeast Asia to southern China was enhanced (weakened), which masked the better (worse) scavenging conditions for aerosols in El Nino (La Nina) winter. The frequency distribution of the simulated daily surface concentrations of aerosols over southern China indicated that the region tended to have fewer clean and moderate (heavy) haze days, but more heavy (moderate) haze days in El Nino (La Nina) winter.