| 杭州COVID-19期间大气VOCs体积分数变化特征 |
| 摘要点击 2114 全文点击 742 投稿时间：2021-03-24 修订日期：2021-06-23 |
| 查看HTML全文
查看全文 查看/发表评论 下载PDF阅读器 |
| 中文关键词 新型冠状病毒肺炎(COVID-19) 挥发性有机物(VOCs) 日变化 化学反应活性 臭氧生成潜势(OFP) |
| 英文关键词 COVID-19 volatile organic compounds (VOCs) daily variation chemical reactivity ozone formation potential(OFP) |
|
| 中文摘要 |
| 2019年12月1日至2020年3月31日新型冠状病毒肺炎（COVID-19）期间，采用Syntech Spectras GC955在线气相色谱仪对杭州市大气环境中挥发性有机物（VOCs）进行了在线连续监测，分析了VOCs的组成特征、日变化规律和大气化学反应活性.结果表明，不同站点疫情前φ（总VOCs）均最高，一级响应期间均最低；夜间φ（总VOCs）普遍高于白天，卧龙桥φ（总VOCs）日变化幅度小于下沙，一级响应期间φ（总VOCs）日变化幅度小于其他3个时期；下沙φ（总VOCs）日变化呈现"V"字型特征，而卧龙桥则呈现出典型的双峰结构；下沙OFP高于卧龙桥，2个点疫情前OFP均最高，下沙一级响应期间OFP最低，卧龙桥二级响应期间OFP最低.下沙芳香烃和烯烃的OFP较高，炔烃OFP最低；卧龙桥烯烃OFP远高于其他3个组分，烷烃次之，炔烃OFP最低. |
| 英文摘要 |
| A continuous observation campaign was carried out with the Syntech Spectras GC955 volatile organics online monitoring system from December 1, 2019 to March 31, 2020 during the COVID-19 period in Hangzhou. Composition characteristics, diurnal variation, and atmospheric chemical reactivity of VOCs were analyzed. The results showed that φ(total VOCs) were the highest before the COVID-19 pandemic in different sites and the lowest during the first response period. The φ(total VOCs) at night was higher than that during the day. The daily variation in Wolongqiao φ(total VOCs) was less than that in Xiasha. The daily variation in φ(total VOCs) during the first level response period was less than that during the other three periods. The diurnal variation in the φ (total VOCs) in Xiasha showed a "V" shape, and that in Wolongqiao showed a typical bimodal structure. The OFP in Xiasha was higher than that in Wolongqiao. The OFP were the highest at the two sites before the COVID-19 pandemic. The OFP was the lowest during the first response period in Xiasha and the lowest during the second response period in Wolongqiao. The OFP of aromatics and olefins was higher, and the OFP of alkynes was the lowest in Xiasha. The OFP of olefin in Wolongqiao was much higher than that of the other three components, followed by alkane and alkyne. |
