Overview of the Focused Isoprene eXperiment at the California Institute of Technology (FIXCIT): mechanistic chamber studies on the oxidation of biogenic compounds
Overview of the Focused Isoprene eXperiment at the California Institute of Technology (FIXCIT): mechanistic chamber studies on the oxidation of biogenic compounds
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DOI：
10.5194/acp-14-13531-2014
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发表时间：
2014-12
影响因子：
6.3
通讯作者：
Tran B. Nguyen;J. Crounse;R. Schwantes;A. Teng;K. Bates;Xuan Zhang;J. S. Clair;W. Brune;G. Tyndall;F. Keutsch;J. Seinfeld;P. Wennberg
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文献类型：
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作者：
Tran B. Nguyen;J. Crounse;R. Schwantes;A. Teng;K. Bates;Xuan Zhang;J. S. Clair;W. Brune;G. Tyndall;F. Keutsch;J. Seinfeld;P. Wennberg
抽象的。加州理工学院（FIXCIT）的聚焦异戊二烯实验是2014年1月期间进行的一项合作大气室活动。FIXCIT是协同现场和实验室工作的实验室组成部分，旨在（1）更好地了解与美国东南部相关的环境观测背后的化学细节，（2）推进重要生物烃的大气氧化机制的知识，以及（3）使用真实标准表征现场仪器的行为。来自14个学术和政府机构的大约20名主要科学家在亚拉巴马的一个森林地点和加州理工学院的大气室进行了平行测量。在为期4周的活动期间，进行了一系列室内实验，以高度受控和大气相关的方式研究异戊二烯、α-蒎烯、甲基丙烯醛、蒎醛、酰基过氧硝酸酯、异戊二烯羟基硝酸酯（ISOPN）、异戊二烯羟基氢过氧化物（ISOPOOH）和异戊二烯环氧二醇（IEPOX）的黑暗和光诱导氧化。活动参与者合成并提供了蒎醛和ISOPN、ISOPOOH和IEPOX的异构体特定标准品，从而能够明确探索这些重要大气化合物的氧化机制和仪器响应。本概述介绍了目标，实验设计，仪器技术，并从运动的初步意见。这项工作为即将出版的与FIXCIT运动有关的出版物提供了背景。从FIXCIT的见解预计将大大有助于解释现场数据和修订目前在区域和全球大气模型中实施的机制。
Abstract. The Focused Isoprene eXperiment at the California Institute of Technology (FIXCIT) was a collaborative atmospheric chamber campaign that occurred during January 2014. FIXCIT is the laboratory component of a synergistic field and laboratory effort aimed toward (1) better understanding the chemical details behind ambient observations relevant to the southeastern United States, (2) advancing the knowledge of atmospheric oxidation mechanisms of important biogenic hydrocarbons, and (3) characterizing the behavior of field instrumentation using authentic standards. Approximately 20 principal scientists from 14 academic and government institutions performed parallel measurements at a forested site in Alabama and at the atmospheric chambers at Caltech. During the 4 week campaign period, a series of chamber experiments was conducted to investigate the dark- and photo-induced oxidation of isoprene, α-pinene, methacrolein, pinonaldehyde, acylperoxy nitrates, isoprene hydroxy nitrates (ISOPN), isoprene hydroxy hydroperoxides (ISOPOOH), and isoprene epoxydiols (IEPOX) in a highly controlled and atmospherically relevant manner. Pinonaldehyde and isomer-specific standards of ISOPN, ISOPOOH, and IEPOX were synthesized and contributed by campaign participants, which enabled explicit exploration into the oxidation mechanisms and instrument responses for these important atmospheric compounds. The present overview describes the goals, experimental design, instrumental techniques, and preliminary observations from the campaign. This work provides context for forthcoming publications affiliated with the FIXCIT campaign. Insights from FIXCIT are anticipated to aid significantly in interpretation of field data and the revision of mechanisms currently implemented in regional and global atmospheric models.