Measurements of peroxyacyl nitrates in the transboundary polluted atmosphere and their impacts on the photchemical reactivity

大气中的有机硝酸酯是大气光氧化产生的二次污染物，在远距离传输，是人类活动较少的偏远地区大气污染的潜在原因。 在本研究中，在位于面向日本海的诺托半岛尖端的Suzu进行了长时间的连续测量。 它们的浓度变化已被分析的季节性和依赖的气团轨迹。 已发现过氧酰基硝酸酯和烷基硝酸酯的相对丰度占约。15- 35%，它们在Suzu的浓度在冬季和春季增加，主要是通过从亚洲大陆的传输，它们参与了观测点附近的原位光化学，这表明它们可能是这样一个偏远地区光化学反应的原因和结果。

Organic nitrate esters in the air are the secondary pollutants yielded by the atmospheric photooxidation, and are transported over long range, implying they are potential causes of air pollutions in the remote areas, where anthropogenic activities are low. In this study, continuous measurements of them have been conducted for long period at Suzu, located at the tip of Noto Peninsula facing to Japan Sea. Their concentration variabilities have been analyzed in terms of the seasonality and also the dependence on the air mass trajectory. It has been found that the relative abundance of peroxyacyl and alkyl nitrates accounts for ca. 15-35 % to NOy, their concentrations at Suzu increase during the winter to spring mainly by the transport from the Asian continent, and they are much involved in in-situ photochemistry near the observational site, suggesting they could be a cause and a result of photochemical reactivity in such a remote area.