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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Isoprene and its oxidation products, methacrolein and methylvinyl ketone, at an urban forested site during the 1999 Southern Oxidants Study
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Isoprene and its oxidation products, methacrolein and methylvinyl ketone, at an urban forested site during the 1999 Southern Oxidants Study

机译：异戊二烯及其氧化产物甲基丙烯醛和甲基乙烯基酮，在1999年南部氧化剂研究中的城市森林地带

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Isoprene (ISOP) and its oxidation products, methacrolein (MACR) and methyl vinyl ketone (MVK), were measured at an urban forested site in Nashville, Tennessee, as part of the 1999 Southern Oxidants Study (SOS). Hourly observations were performed at Cornelia Fort Airpark for a 4 week period between June 13 and July 14. At the midday photochemical peak (1200 local standard time, LST), average mixing ratios of isoprene, MACR, and MVK were 410 parts per trillion by volume (pptv), 240 pptv, and 430 pptv, respectively. Median isoprene, MACR, and MVK mixing ratios were 400 pptv, 200 pptv, and 360 pptv, respectively, at 1200 LST. An emissions inventory calculation for Davidson County, encompassing Nashville, suggests that MACR and MVK were produced predominately from isoprene oxidation rather than direct combustion emissions. The observations are compared with results from two chemical models: a simple sequential reaction scheme and a one-dimensional (1-D) numerical box model. The daytime ratios of MVK/ISOP and MACR/ISOP varied in a systematic manner and can be reproduced by the analytical solution of the sequential reaction scheme. Air masses with more photochemically aged isoprene were observed during SOS 1999 at Cornelia Fort (0.3-1.6 hours) compared to the SOS 1990 canopy study at Kinterbish (0.1-0.6 hours). This is consistent with the proximity of the tower inlets to the forest canopies during both campaigns. Isoprene had a chemical lifetime of 20 min at the average observed midday HO mixing ratio of 8 x 10(6) molecules/cm(3). As a result, significant conversion of isoprene to its oxidation products was observed on the timescale of transport from the dense forest canopies surrounding Nashville. The systematic diurnal behavior in the MVK/MACR ratio can also be simulated with a 1-D photochemical box model. General agreement between the observations of MACR and MVK during SOS 1999 with the two chemical models suggests we have a comprehensive understanding of the first few stages of isoprene oxidation in this urban forested environment. [References: 31]
机译：异戊二烯（ISOP）及其氧化产物甲基丙烯醛（MACR）和甲基乙烯基酮（MVK）在田纳西州纳什维尔的一个城市森林地点进行了测量，这是1999年南方氧化剂研究（SOS）的一部分。从6月13日至7月14日，在Cornelia Fort Airpark飞机场进行了为时4周的每小时观测。在午间光化学峰（当地标准时间1200，LST）时，异戊二烯，MACR和MVK的平均混合比为410兆兆音量（pptv），240 pptv和430 pptv。在1200 LST下，异戊二烯，MACR和MVK的中位混合比分别为400 pptv，200 pptv和360 pptv。包括纳什维尔在内的戴维森县的排放清单计算表明，MACR和MVK主要是由异戊二烯氧化产生的，而不是直接燃烧产生的。将观察结果与两种化学模型的结果进行比较：简单的顺序反应方案和一维（1-D）数字盒模型。 MVK / ISOP和MACR / ISOP的白天比率以系统的方式变化，可以通过顺序反应方案的分析解决方案来再现。与在Kinterbish进行的SOS 1990机盖研究（0.1-0.6小时）相比，在Cornelia Fort的SOS 1999期间（0.3-1.6小时）观察到了具有更多光化学老化的异戊二烯的空气团。这与两次活动期间塔架入口与林冠的接近程度相符。异戊二烯的化学寿命为20分钟，平均观察到的中午HO混合比为8 x 10（6）分子/ cm（3）。结果，在从纳什维尔周围茂密的林冠层运输的时间尺度上观察到异戊二烯向其氧化产物的显着转化。 MVK / MACR比值中的系统昼夜行为也可以使用一维光化学盒模型进行模拟。 1999年SOS期间对MACR和MVK的观测与这两种化学模型之间的一般一致性表明，我们对该城市森林环境中异戊二烯氧化的前几个阶段有了全面的了解。 [参考：31]

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