Monoterpene chemical speciation in a tropical rainforest : variation with season, height, and time of dayat the Amazon Tall Tower Observatory (ATTO)
Monoterpene chemical speciation in a tropical rainforest : variation with season, height, and time of dayat the Amazon Tall Tower Observatory (ATTO)
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热带雨林中的单萜化学形态：亚马逊高塔天文台 (ATTO) 随季节、高度和时间的变化
DOI：
10.5194/acp-18-3403-2018
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发表时间：
2017
影响因子：
6.3
通讯作者：
J. Kesselmeier
中科院分区：
文献类型：
--
作者：
A. Yáñez;A. Nölscher;E. Bourtsoukidis;E. Alves;L. Ganzeveld;B. Bonn;S. Wolff;M. Sá;M. Yamasoe;Jonathan Williams;M. Andreae;J. Kesselmeier
抽象的。雨林空气中特定单萜的测量很少，但它们
对于理解这些化合物对
挥发性有机化合物 (VOC) 排放的总体反应性
主要大气氧化剂，如羟基自由基（OH）、臭氧（O 3）和
硝酸根（NO3）。在这项研究中，我们提出了化学形态
在亚马逊热带雨林中测量的气相单萜
高塔天文台（ATTO，亚马逊，巴西）。 VOC 样品为
由位于 12 点和 12 点的塔上的两个自动采样系统收集
24米高并使用气相色谱-火焰离子化检测器进行分析。样品采集于 2015 年 10 月，代表干
季节，并与之前在现场进行的湿季和干季研究进行比较。在
此外，总单萜的垂直剖面测量（12 米和 24 米）
使用质子转移反应质谱法确定混合比例。结果显示出明显不同的化学形态
白天和黑夜之间。例如，α-蒎烯含量更丰富
白天，而柠檬烯在晚上更丰富。反应性
计算表明，较高的丰度通常并不意味着较高的
反应性。此外，年间和年内结果表明类似
分析旱季期间的化学多样性。带顶篷的模拟
交换建模系统显示模拟的单萜混合比例
与观察到的混合比比较得很好，但也表明
需要进行更多实验来增强我们对树冠内的了解
这些化合物的汇。
Abstract. Speciated monoterpene measurements in rainforest air are scarce, but they are
essential for understanding the contribution of these compounds to the
overall reactivity of volatile organic compound (VOC) emissions towards the
main atmospheric oxidants, such as hydroxyl radicals (OH), ozone (O 3) and
nitrate radicals ( NO3 ). In this study, we present the chemical speciation
of gas-phase monoterpenes measured in the tropical rainforest at the Amazon
Tall Tower Observatory (ATTO, Amazonas, Brazil). Samples of VOCs were
collected by two automated sampling systems positioned on a tower at 12 and
24 m height and analysed using gas chromatography–flame ionization detection. The samples were collected in October 2015, representing the dry
season, and compared with previous wet and dry season studies at the site. In
addition, vertical profile measurements (at 12 and 24 m) of total monoterpene
mixing ratios were made using proton-transfer-reaction mass spectrometry. The results showed a distinctly different chemical speciation
between day and night. For instance, α -pinene was more abundant
during the day, whereas limonene was more abundant at night. Reactivity
calculations showed that higher abundance does not generally imply higher
reactivity. Furthermore, inter- and intra-annual results demonstrate similar
chemodiversity during the dry seasons analysed. Simulations with a canopy
exchange modelling system show simulated monoterpene mixing ratios that
compare relatively well with the observed mixing ratios but also indicate
the necessity of more experiments to enhance our understanding of in-canopy
sinks of these compounds.
德国云杉林地大气自由基与新形成颗粒之间的联系
影响因子：
6.3
作者：
Bonn B
通讯作者：
Bonn B
影响因子：
6.3
作者：
Andreae, M. O.;Acevedo, O. C.;Yanez-Serrano, A. M.
通讯作者：
Yanez-Serrano, A. M.