Different HONO sources for three layers at the urban area of Beijing.
Different HONO sources for three layers at the urban area of Beijing.
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DOI：
10.1021/acs.est.0c02146
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发表时间：
2020-09
影响因子：
11.4
通讯作者：
Wenqian Zhang;Shengrui Tong;Chenhui Jia;Lili Wang;Baoxian Liu;G. Tang;D. Ji;B. Hu;Zirui Liu-Zirui-Li
中科院分区：
文献类型：
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作者：
Wenqian Zhang;Shengrui Tong;Chenhui Jia;Lili Wang;Baoxian Liu;G. Tang;D. Ji;B. Hu;Zirui Liu-Zirui-Li
气态亚硝酸（HONO）是羟基（OH）自由基的重要前体，羟基自由基是大气中的“清洁剂”。目前，城市污染区HONO的形成机制存在争议，限制了对大气氧化能力和自由基循环的认识。本文首次在北京城区三个高度同时进行了HONO和NOx的多日垂直观测。HONO的垂直分布往往是出人意料的，在120 m处HONO浓度最高，其次是8 m和240 m。0D箱模型模拟表明，地面和气溶胶表面可能发挥类似的作用，在8米的NO2转换在整个测量。在灰霾天气中，NO2在气溶胶表面的转化是高空HONO最重要的来源。在白天，城市高空中意外地存在一个很强的HONO缺失源，它与太阳辐射和OH的消耗有关。
Gaseous nitrous acid (HONO) is a crucial precursor of hydroxyl (OH) radical, which is a "detergent" in the atmosphere. Nowadays, HONO formation mechanisms at polluted urban areas are controversial, which restricts the understanding of atmospheric oxidative capacity and radical cycling. Herein, multi-day vertical observation of HONO and NOx was simultaneously performed at three heights at the urban area of Beijing for the first time. The vertical distribution of HONO was often unexpected, which had the highest HONO concentration at 120 m, followed by those at 8 m and 240 m. 0D box model simulations suggest that ground and aerosol surfaces might play similar roles in NO2 conversion at 8 m during the whole measurement. NO2 conversion on aerosol surfaces was the most important HONO source aloft during haze days. At daytime, a strong missing HONO source unexpectedly existed in the urban aloft and it was relevant with solar radiation and consumed OH.