...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Atmospheric chemistry and physics >In situ measurements and modeling of reactive trace gases in a small biomass burning plume
【24h】

In situ measurements and modeling of reactive trace gases in a small biomass burning plume

机译：小型生物质燃烧烟羽中反应性痕量气体的原位测量和建模

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

An instrumented NASA P-3B aircraft was used for airborne sampling of trace gases in a plume that had emanated from a small forest understory fire in Georgia, USA. The plume was sampled at its origin to derive emission factors and followed aEuro parts per thousand 13.6 km downwind to observe chemical changes during the first hour of atmospheric aging. The P-3B payload included a proton-transfer-reaction time-of-flight mass spectrometer (PTR-ToF-MS), which measured non-methane organic gases (NMOGs) at unprecedented spatiotemporal resolution (10 m spatial/0.1 s temporal). Quantitative emission data are reported for CO2, CO, NO, NO2, HONO, NH3, and 16 NMOGs (formaldehyde, methanol, acetonitrile, propene, acetaldehyde, formic acid, acetone plus its isomer propanal, acetic acid plus its isomer glycolaldehyde, furan, isoprene plus isomeric pentadienes and cyclopentene, methyl vinyl ketone plus its isomers crotonaldehyde and methacrolein, methylglyoxal, hydroxy acetone plus its isomers methyl acetate and propionic acid, benzene, 2,3-butanedione, and 2-furfural) with molar emission ratios relative to CO larger than 1 ppbV ppmV(-1). Formaldehyde, acetaldehyde, 2-furfural, and methanol dominated NMOG emissions. No NMOGs with more than 10 carbon atoms were observed at mixing ratios larger than 50 pptV ppmV(-1) CO. Downwind plume chemistry was investigated using the observations and a 0-D photochemical box model simulation. The model was run on a nearly explicit chemical mechanism (MCM v3.3) and initialized with measured emission data. Ozone formation during the first hour of atmospheric aging was well captured by the model, with carbonyls (formaldehyde, acetaldehyde, 2,3-butanedione, methylglyoxal, 2-furfural) in addition to CO and CH4 being the main drivers of peroxy radical chemistry. The model also accurately reproduced the sequestration of NOx into peroxyacetyl nitrate (PAN) and the OH-initiated degradation of furan and 2-furfural at an average OH concentration of 7.45 +/- 1.07 x 10(6)aEuro-cm(-3) in the plume. Formaldehyde, acetone/propanal, acetic acid/glycolaldehyde, and maleic acid/maleic anhydride (tentatively identified) were found to be the main NMOGs to increase during 1 h of atmospheric plume processing, with the model being unable to capture the observed increase. A mass balance analysis suggests that about 50 % of the aerosol mass formed in the downwind plume is organic in nature.
机译：NASA P-3B仪表飞机用于从机上采样美国佐治亚州一场小型森林地下火灾所散发的烟气中的痕量气体。在羽流的起源处对羽流进行采样，以得出排放因子，并在下风向的头13.6 km中追踪千分之欧元，以观察大气老化第一个小时内的化学变化。 P-3B载荷包括一个质子转移反应飞行时间质谱仪（PTR-ToF-MS），该质谱仪以空前的时空分辨率（10 m空间/0.1 s时间）测量了非甲烷有机气体（NMOG）。 。报告了CO2，CO，NO，NO2，HONO，NH3和16种NMOG的定量排放数据（甲醛，甲醇，乙腈，丙烯​​，乙醛，甲酸，丙酮及其异构体丙醛，乙酸及其异构体乙醇醛，呋喃，异戊二烯及其异构体戊二烯和环戊烯，甲基乙烯基酮及其异构体巴豆醛和甲基丙烯醛，甲基乙二醛，羟基丙酮及其异构体乙酸甲酯和丙酸，苯，2,3-丁二酮和2-糠醛，相对于CO的摩尔排放比大于1 ppbV ppmV（-1）。甲醛，乙醛，2-糠醛和甲醇是NMOG排放的主要来源。在混合比大于50 pptV ppmV（-1）CO的情况下，未观察到碳原子数超过10的NMOG。使用观测值和0-D光化学盒模型模拟研究了顺风羽状化学。该模型在几乎明确的化学机制（MCM v3.3）上运行，并使用测得的排放数据进行了初始化。该模型可以很好地捕获大气老化第一个小时中的臭氧形成，其中羰基化合物（甲醛，乙醛，2,3-丁二酮，甲基乙二醛，2-糠醛）以及过氧化自由基化学的主要驱动力是二氧化碳。该模型还准确地将NOx螯合到过氧乙酰硝酸盐（PAN）中，并以OH引发的呋喃和2-糠醛的平均OH浓度为7.45 +/- 1.07 x 10（6）aEuro-cm（-3）降解。在羽中。甲醛，丙酮/丙醛，乙酸/乙醇醛和马来酸/马来酸酐（初步确定）是在大气羽流处理1小时内增加的主要NMOG，该模型无法捕获观察到的增加。质量平衡分析表明，顺风羽流中形成的气溶胶质量中约有50％是自然的。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号