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首页> 外文期刊>Atmospheric chemistry and physics >Evidence for a significant proportion of Secondary Organic Aerosol from isoprene above a maritime tropical forest
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Evidence for a significant proportion of Secondary Organic Aerosol from isoprene above a maritime tropical forest

机译：海上热带森林上方异戊二烯中大量次生有机气溶胶的证据

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Isoprene is the most abundant non-methane biogenic volatile organic compound(BVOC), but the processes governing secondary organic aerosol (SOA) formationfrom isoprene oxidation are only beginning to become understood and selectivequantification of the atmospheric particulate burden remains difficult.Organic aerosol above a tropical rainforest located in Danum Valley, Borneo,Malaysia, a high isoprene emission region, was studied during Summer 2008using Aerosol Mass Spectrometry and offline detailed characterisation usingcomprehensive two dimensional gas chromatography. Observations indicate thata substantial fraction (up to 15% by mass) of atmospheric sub-micronorganic aerosol was observed as methylfuran (MF) after thermal desorption.This observation was associated with the simultaneous measurements ofestablished gas-phase isoprene oxidation products methylvinylketone (MVK) andmethacrolein (MACR). Observations of MF were also made during experimentalchamber oxidation of isoprene. Positive matrix factorisation of the AMSorganic mass spectral time series produced a robust factor which accounts foran average of 23% (0.18 μg m?3), reaching as much as53% (0.50 μg m?3) of the total oraganic loading,identified by (and highly correlated with) a strong MF signal. Assuming thatthis factor is generally representative of isoprene SOA, isoprene derivedaerosol plays a significant role in the region. Comparisons with measurementsfrom other studies suggest this type of isoprene SOA plays a role in otherisoprene dominated environments, albeit with varying significance.
机译：异戊二烯是最丰富的非甲烷生物成因挥发性有机化合物（BVOC），但从异戊二烯氧化开始控制次级有机气溶胶（SOA）形成的过程才刚刚被人们理解，并且对大气颗粒物负荷的选择性量化仍然很困难。 2008年夏季，使用气溶胶质谱法研究了异戊二烯排放量高的马来西亚婆罗洲Danum山谷的热带雨林，并使用了二维二维气相色谱仪对离线热带雨林进行了详细表征。观察结果表明，热脱附后观察到大部分亚微有机气溶胶（质量分数高达15％）为甲基呋喃（MF），该观察结果与同时测定已建立的气相异戊二烯氧化产物甲基乙烯基酮（MVK）和甲基丙烯醛有关（MACR）。在异戊二烯的实验室氧化过程中也观察到了MF。 AMS有机质谱时间序列的正矩阵分解产生了稳健的因子，平均占23％（0.18μgm ？3 ），高达53％（0.50μgm ？3） ），由强MF信号确定（并与之高度相关）。假设该因素通常代表异戊二烯SOA，则异戊二烯衍生的气溶胶在该区域起着重要作用。与来自其他研究的测量结果的比较表明，这种异戊二烯SOA在其他异戊二烯为主的环境中也发挥着作用，尽管意义各不相同。

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