2-Methyl-3-buten-2-ol (MBO) is an important biogenic hydrocarbon emitted in large quantities by pine forests. Atmospheric photooxidation of MBO is known to lead to oxygenated compounds, such as glycolaldehyde, which is the precursor to glyoxal. Recent studies have shown that the reactive uptake of glyoxal onto aqueous particles can lead to formation of secondary organic aerosol (SOA). In this work, MBO photooxidation under high- and low-NO(x) conditions was performed in dual laboratory chambers to quantify the yield of glyoxal and investigate the potential for SOA formation. The yields of glycolaldehyde and 2-hydroxy-2-methylpropanal (HMPR), fragmentation products of MBO photooxidation, were observed to be lower at lower NO(x) concentrations. Overall, the glyoxal yield from MBO photooxidation was 25% under high-NO(x) and 4% under low-NO(x) conditions. In the presence of wet ammonium sulfate seed and under high-NO(x) conditions, glyoxal uptake and SOA formation were not observed conclusively, due to relatively low (< 30 ppb) glyoxal concentrations. Slight aerosol formation was observed under low-NO(x) and dry conditions, with aerosol mass yields on the order of 0.1%. The small amount of SOA was not related to glyoxal uptake, but is likely a result of reactions similar to those that generate isoprene SOA under low-NO(x) conditions. The difference in aerosol yields between MBO and isoprene photooxidation under low-NO(x) conditions is consistent with the difference in vapor pressures between triols (from MBO) and tetrols (from isoprene). Despite its structural similarity to isoprene, photooxidation of MBO is not expected to make a significant contribution to SOA formation.

中文翻译：

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2-甲基-3-丁烯-2-醇（MBO）的光氧化作用是次要有机气溶胶的潜在来源。

2-甲基-3-丁烯-2-醇（MBO）是一种重要的生物碳氢化合物，由松树林大量排放。已知MBO的大气光氧化会生成含氧化合物，例如乙醛的乙二醛。最近的研究表明，乙二醛在水性颗粒上的反应性吸收可导致形成次级有机气溶胶（SOA）。在这项工作中，在高和低NO（x）条件下的MBO光氧化是在双实验室室内进行的，以量化乙二醛的收率并研究SOA形成的潜力。在较低的NO（x）浓度下，发现乙醇醛和2-羟基-2-甲基丙醛（HMPR）（MBO光氧化的裂解产物）的收率较低。全面的，MBO光氧化产生的乙二醛收率在高NO（x）下为25％，在低NO（x）条件下为4％。在湿的硫酸铵种子存在下并且在高NO（x）条件下，由于相对较低的乙二醛浓度（<30 ppb），无法最终观察到乙二醛的吸收和SOA的形成。在低NO（x）和干燥条件下观察到少量气溶胶形成，气溶胶质量产率约为0.1％。少量的SOA与乙二醛的吸收无关，但可能是类似于在低NO（x）条件下生成异戊二烯SOA的反应的结果。在低NO（x）条件下MBO和异戊二烯光氧化之间气溶胶产量的差异与三醇（来自MBO）和四醇（来自异戊二烯）之间的蒸气压差异一致。尽管其结构与异戊二烯相似，