Variation on the atmospheric concentrations of biogenic carbonyl compounds and their removal processes in the northern forest at Moshiri, Hokkaido Island in Japan
Variation on the atmospheric concentrations of biogenic carbonyl compounds and their removal processes in the northern forest at Moshiri, Hokkaido Island in Japan
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DOI：
10.1029/2003jd004100
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发表时间：
2004-02-18
影响因子：
4.4
通讯作者：
Kawamura, K
中科院分区：
文献类型：
--
作者：
Matsunaga, S;Mochida, M;Kawamura, K
[10]采用环形采伐系统（ADSS）采集了栎和云杉混交林中气相和颗粒相的生物源醛、羟基羰基和二羰基。2002年8月22日至29日收集了80个样本。同时用扫描迁移率粒度仪（SMPS）观察了气溶胶的粒径分布。这些羰基化合物的气态浓度范围从检测极限（约1 pptv）到154 pptv （630 ng m(-3)， 4-氧戊二醛），颗粒浓度范围从检测极限（约3 ng m(-3)）到200 ng m(-3)（4-氧戊二醛）。虽然这些化合物的生产过程彼此不同，但气体浓度的时间变化非常相似。此外，这种变化也与环境温度的变化相似。此外，胃颗粒转化被认为是这些化合物的重要去除过程。我们可以通过ADSS测量来评估气体到颗粒转化作为气体物种去除过程的重要性。此外，我们的实验结果表明，转化包括两个过程。第一种是对已经存在于大气中的气溶胶的吸附。第二步是溶入气溶胶中的水相。后一种方法特别适用于水溶性化合物。该测量使我们能够确定生物源性半挥发性有机化合物（soc）最可能的去除过程。本文讨论了森林大气中半挥发性羰基和生物源性羰基的这些过程。
[1] Biogenic aldehydes, hydroxycarbonyls, and dicarbonyls in gas and particle phases were collected with an annular denuder sampling system (ADSS) in a Quercus crispula and Picea glehnii mast mixed forest. Eighty samples were collected from 22 to 29 August 2002. The size distributions of aerosols were also observed concurrently with a scanning mobility particle sizer (SMPS). The gaseous concentrations of these carbonyl compounds ranged from the detection limit (approximately 1 pptv) to 154 pptv (630 ng m(-3), 4-oxopentanal), and the particulate concentrations ranged from the detection limit (approximately 3 ng m(-3)) to 200 ng m(-3) (4-oxopentanal). Although the production processes of these compounds are different from each other, the temporal variations of the gaseous concentrations were quite similar. In addition, the variation was also similar to that of the ambient temperature. Furthermore, gastoparticle conversion was suggested to be an important removal process of these compounds. We could evaluate the importance of the gas-to-particle conversion as a removal process of the gaseous species by an ADSS measurement. In addition, the results of our experiment indicated that the conversion includes two processes. The first is an adsorption onto the aerosols which have already existed in the atmosphere. The next is dissolution into the water phases in the aerosols. The latter process was particular to water soluble compounds. The measurement allowed us to identify the most likely removal processes of biogenic semivolatile organic compounds (SOCs). In this study, we discuss about these processes of semivolatile and biogenic carbonyls in the forest atmosphere.