Methyl chavicol: characterization of its biogenic emission rate, abundance, and oxidation products in the atmosphere
Methyl chavicol: characterization of its biogenic emission rate, abundance, and oxidation products in the atmosphere
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DOI：
10.5194/acp-9-2061-2009
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发表时间：
2009-01-01
影响因子：
6.3
通讯作者：
Holzinger, R.
中科院分区：
文献类型：
--
作者：
Bouvier-Brown, N. C.;Goldstein, A. H.;Holzinger, R.
我们报告了甲基胡椒酚的环境大气混合比的测量结果，并确定了其生物排放率。甲基胡椒酚是一种生物含氧芳香化合物，在布洛吉特森林（加利福尼亚州内华达山脉的黄松林）内部和上方含量丰富。通过三个原位仪器同时检测到甲基胡椒酚，即带质谱检测器的气相色谱仪 (GC-MS)、质子转移反应质谱仪 (PTR-MS) 和热解吸气溶胶 GC-MS (TAG)，并发现布洛杰特森林内部和上方的甲基胡椒酚含量丰富。甲基胡椒酚大气混合比与 2-甲基-3-丁烯-2-醇 (MBO) 密切相关，MBO 是布洛杰特森林黄松树的一种与光和温度相关的生物排放物。根据这种相关性，甲基胡椒酚的排放量占白天以 MBO 形式排放的碳质量的 4-68%，具体取决于季节。根据这种关系，我们估计白天基础排放率为 0.72-10.2 mu gCg(-1) h(-1)，具体取决于针龄和季节性。我们还首次观察到其在环境大气中的氧化产物（4-甲氧基苯甲醛和4-甲氧基苯乙醛）。甲基胡椒酚是许多植物物种的主要精油成分。这项工作表明，甲基胡椒酚在布洛吉特森林以及其他潜在地点的大气化学中发挥着重要作用，并且应明确包含在生物挥发性有机碳排放和大气化学模型中。
We report measurements of ambient atmospheric mixing ratios for methyl chavicol and determine its biogenic emission rate. Methyl chavicol, a biogenic oxygenated aromatic compound, is abundant within and above Blodgett Forest, a ponderosa pine forest in the Sierra Nevada Mountains of California. Methyl chavicol was detected simultaneously by three in-situ instruments - a gas chromatograph with mass spectrometer detector (GC-MS), a proton transfer reaction mass spectrometer (PTR-MS), and a thermal desorption aerosol GC-MS (TAG) - and found to be abundant within and above Blodgett Forest. Methyl chavicol atmospheric mixing ratios are strongly correlated with 2-methyl-3-buten-2-ol (MBO), a light- and temperature-dependent biogenic emission from the ponderosa pine trees at Blodgett Forest. Scaling from this correlation, methyl chavicol emissions account for 4-68% of the carbon mass emitted as MBO in the daytime, depending on the season. From this relationship, we estimate a daytime basal emission rate of 0.72-10.2 mu gCg(-1) h(-1), depending on needle age and seasonality. We also present the first observations of its oxidation products (4-methoxybenzaldehyde and 4-methyoxy benzene acetaldehyde) in the ambient atmosphere. Methyl chavicol is a major essential oil component of many plant species. This work suggests that methyl chavicol plays a significant role in the atmospheric chemistry of Blodgett Forest, and potentially other sites, and should be included explicitly in both biogenic volatile organic carbon emission and atmospheric chemistry models.