The occurrence of new particle formation (NPF) events detected in a coastal agricultural site, at Qvidja, in Southwestern Finland, was investigated using the data measured with a nitrate ion-based chemical-ionization atmospheric-pressure-interface time-of-flight (CI-APi-TOF) mass spectrometer. The binned positive matrix factorization method (binPMF) was applied to the measured spectra. It resulted in eight factors describing the time series of ambient gas and cluster composition at Qvidja during spring 2019. The most interesting factors related to the observed NPF events were the two factors with the highest mass-to-charge ratios, numbered 7 and 8, both having profiles with patterns of highly oxygenated organic molecules with one nitrogen atom. It was observed that factor 7 had elevated intensities during the NPF events. A variable with an even better connection to the observed NPF events is f_F7, which denotes the fraction of the total spectra within the studied mass-to-charge ratio range between 169 and 450 Th being in a form of factor 7. Values of f_F7 higher than 0.50±0.05 were observed during the NPF events, of which durations also correlated with the duration of f_F7 exceeding this critical value. It was also observed that factor 8 acts like a precursor for factor 7 with solar radiation and that the formation of factor 8 is associated with ozone levels.

中文翻译：

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测量报告：用硝酸盐 CI-APi-TOF 光谱的 binPMF 分析解释沿海农业场地的大气新颗粒形成

使用基于硝酸根离子的化学电离大气压力界面飞行时间测量的数据研究了在芬兰西南部 Qvidja 沿海农业场地检测到的新粒子形成 (NPF) 事件的发生。 CI-APi-TOF) 质谱仪。将合并的正矩阵分解方法 (binPMF) 应用于测量的光谱。它产生了描述 2019 年春季 Qvidja 环境气体和星团组成时间序列的八个因素。与观察到的 NPF 事件相关的最有趣的因素是质荷比最高的两个因素，编号为 7 和 8，两者都具有具有一个氮原子的高度氧化的有机分子的模式。据观察，因素 7 在 NPF 事件期间具有升高的强度。f _F7，表示在所研究的质荷比范围内 169 和 450 Th 之间的总光谱的分数，其形式为因子 7。在 NPF 事件期间观察到f _F7的值高于0.50±0.05 ，其中持续时间还与超过该临界值的f _{F7的持续时间相关。}还观察到，因子 8 在太阳辐射下就像因子 7 的前体，并且因子 8 的形成与臭氧水平有关。