Mohr Claudia, Thornton Joel A, Shrivastava Manish, Chassaing Anouck, Riipinen Ilona, Bianchi Federico, Andrade Marcos, Wu Cheng
Paul Scherrer Institute (PSI), Switzerland.
ETH Zurich, Switzerland.
Faraday Discuss. 2025 Jun 16;258(0):60-75. doi: 10.1039/d4fd00179f.
We present direct observations of 2-methyltetrol (CHO) in the gas- and particle phase from the deployment of a Filter Inlet for Gases and Aerosols coupled to a Time-of-Flight Chemical Ionization Mass Spectrometer (FIGAERO-CIMS) during the Southern Hemisphere High Altitude Experiment on Particle Nucleation and Growth (SALTENA), which took place between December 2017 and June 2018 at the high-altitude Global Atmosphere Watch station Chacaltaya (CHC) located at 5240 m a s l in the Bolivian Andes. 2-Methyltetrol signals were dominant in a factor resulting from Positive Matrix Factorization (PMF) identified as influenced by Amazon emissions. We combine these observations with investigations of isoprene oxidation chemistry and uptake in an isolated deep convective cloud in the Amazon using a photochemical box model with coupled cloud microphysics and show that, likely, 2-methyltetrol is taken up by hydrometeors or formed in the convective cloud, and then transported in the particle phase in the cold environment of the Amazon outflow and to the station, where it partially evaporates.
在2017年12月至2018年6月于玻利维亚安第斯山脉海拔5240米的查卡尔塔亚（CHC）高海拔全球大气观测站进行的南半球高空粒子成核与生长实验（SALTENA）期间，我们通过部署与飞行时间化学电离质谱仪（FIGAERO-CIMS）相连的气体和气溶胶过滤入口，对气相和颗粒相中的2-甲基四醇（CHO）进行了直接观测。2-甲基四醇信号在正矩阵分解（PMF）得出的一个因子中占主导地位，该因子被确定受亚马逊排放影响。我们将这些观测结果与对异戊二烯氧化化学以及在亚马逊地区一个孤立的深对流云中的摄取情况的研究相结合，使用一个耦合云微物理的光化学箱模型，结果表明，2-甲基四醇很可能被水凝物摄取或在对流云中形成，然后在亚马逊外流的寒冷环境中以颗粒相形式传输到该观测站，在那里它会部分蒸发。
