Summertime contributions of isoprene, monoterpenes, and sesquiterpene oxidation to the formation of secondary organic aerosol in the troposphere over Mt. Tai, Central East China during MTX2006
Summertime contributions of isoprene, monoterpenes, and sesquiterpene oxidation to the formation of secondary organic aerosol in the troposphere over Mt. Tai, Central East China during MTX2006
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DOI：
10.5194/acpd-9-16941-2009
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发表时间：
2009-08
影响因子：
6.3
通讯作者：
P. Fu;K. Kawamura;P. Pochanart;H. Tanimoto;Y. Kanaya;Zhaoyi Wang
中科院分区：
文献类型：
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作者：
P. Fu;K. Kawamura;P. Pochanart;H. Tanimoto;Y. Kanaya;Zhaoyi Wang
为了更好地了解生物源挥发性有机化合物对高山地区二次有机气溶胶（SOA）形成的贡献，在山顶采集了大气气溶胶。Tai（海拔1534米），初夏，在泰山2006实验活动（MTX 2006）期间，中国中部和东部（CEC）。使用气相色谱/质谱法测量异戊二烯、单萜和β-卡勒烯氧化产物的生物源SOA示踪剂。所有的生物源SOA示踪剂没有表现出明显的日变化，这表明它们是在长距离大气传输过程中形成的。虽然异戊二烯和单萜衍生的SOA示踪剂与左旋葡聚糖（生物质燃烧示踪剂）不相关，但β-丁香酸与左旋葡聚糖显示出良好的相关性，表明生物质燃烧可能是该化合物的来源。异戊二烯氧化产物的总浓度远高于单萜和β-香芹烯氧化产物的总浓度。异戊二烯单萜氧化产物的比例（R iso/mono）被发现与臭氧和NOx在夏季活动的共同变化。Riso/mono值白天平均为6.94，夜间平均为10.0。这些值在不同地区的气溶胶中是最高的，这可能是由于大的异戊二烯通量，高的O3和NOx水平和CEC中相对较高的OH浓度。使用基于示踪剂的方法，我们估计来自异戊二烯、单萜和β-香芹烯的次生有机碳（SOC）的平均浓度在白天为1.76 μgC m −3，在夜间为1.85 μgC m −3。这些值对应于总OC浓度的11.2%和11.0%，其中异戊二烯衍生的SOC在白天和夜间分别为7.4%和8.0%。研究表明，在高海拔地区，异戊二烯是比单萜和β-香芹烯更重要的生物SOA的前体物质。
To better understand the contribution of biogenic volatile organic compounds to the formation of secondary organic aerosol (SOA) in high mountain regions, ambient aerosols were collected at the summit of Mt. Tai (1534 m, a.s.l.), Central East China (CEC) during the Mount Tai eXperiment 2006 campaign (MTX2006) in early summer. Biogenic SOA tracers of isoprene, monoterpenes, and β-caryophyllene oxidation products were measured using gas chromatography/mass spectrometry. All the biogenic SOA tracers showed no clear diurnal variations, suggesting that they are formed during long-range atmospheric transport. Although isoprene- and monoterpene-derived SOA tracers did not correlate with levoglucosan (a biomass burning tracer), β-caryophyllinic acid showed a good correlation with levoglucosan, indicating that biomass burning may be a source for this compound. Total concentrations of isoprene oxidation products are much higher than those of monoterpene and β-caryophyllene oxidation products. The ratio of isoprene to monoterpene oxidation products ( R iso/mono ) was found to co-vary with ozone and NO x during the summer campaign. The average R iso/mono value was 6.94 at daytime and 10.0 at nighttime. These values are among the highest in the aerosols studied in different regions, which may be due to the large isoprene fluxes, high O 3 and NO x levels and relatively high OH concentrations in CEC. Using a tracer-based method, we estimated the average concentrations of secondary organic carbon (SOC) derived from isoprene, monoterpenes, and β-caryophyllene to be 1.76 μgC m −3 at daytime and 1.85 μgC m −3 at nighttime. These values correspond to 11.2% and 11.0% of the total OC concentrations, in which isoprene-derived SOC are 7.4% and 8.0% at day- and night-time, respectively. This study suggests that isoprene is a more significant precursor for biogenic SOA than monoterpenes and β-caryophyllene in high altitude in CEC.