Airborne hydrogen cyanide measurements using a chemical ionisation mass spectrometer for the plume identification of biomass burning forest fires
Airborne hydrogen cyanide measurements using a chemical ionisation mass spectrometer for the plume identification of biomass burning forest fires
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DOI：
10.5194/acp-13-9217-2013
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发表时间：
2013-09
影响因子：
6.3
通讯作者：
M. Breton;A. Bacak;J. Muller;S. O'Shea;P. Xiao;M. Ashfold;M. Cooke;R. Batt;D. Shallcross
中科院分区：
文献类型：
--
作者：
M. Breton;A. Bacak;J. Muller;S. O'Shea;P. Xiao;M. Ashfold;M. Cooke;R. Batt;D. Shallcross
摘要。化学电离质谱仪（CIMS）在2011年BORTAS活动期间在加拿大FAAM BAe-146研究飞机上开发，用于使用I -试剂离子测量生物质燃烧事件中产生的氰化氢（HCN）。电离方案使高灵敏度测量在1赫兹频率通过对流层中的生物质燃烧羽流。HCN与一氧化碳（CO）和乙腈（CH3CN）之间有很强的相关性，表明HCN作为生物质燃烧（BB）标志物的潜力。羽流被定义为高于飞行背景6个标准差。该方法与许多采用CO和CH3CN测量的替代羽流定义技术进行了比较。6-sigma技术产生了与CO相关的最高R2值。计算出的归一化过量混合比（NEMR）为3.68±0.149 pptv ppbv−1，这在先前研究中引用的范围内（Hornbrook et al., 2011）。全球对流层模式STOCHEM-CRI结合了观测到的比率和从其他研究中得出的极端比率，以产生通过生物质燃烧产生的全球HCN排放总量。利用这项工作得出的比值，BB的HCN总排放量为0.92 Tg (N) yr - 1。
Abstract. A chemical ionisation mass spectrometer (CIMS) was developed for measuring hydrogen cyanide (HCN) from biomass burning events in Canada using I− reagent ions on board the FAAM BAe-146 research aircraft during the BORTAS campaign in 2011. The ionisation scheme enabled highly sensitive measurements at 1 Hz frequency through biomass burning plumes in the troposphere. A strong correlation between the HCN, carbon monoxide (CO) and acetonitrile (CH3CN) was observed, indicating the potential of HCN as a biomass burning (BB) marker. A plume was defined as being 6 standard deviations above background for the flights. This method was compared with a number of alternative plume-defining techniques employing CO and CH3CN measurements. The 6-sigma technique produced the highest R2 values for correlations with CO. A normalised excess mixing ratio (NEMR) of 3.68 ± 0.149 pptv ppbv−1 was calculated, which is within the range quoted in previous research (Hornbrook et al., 2011). The global tropospheric model STOCHEM-CRI incorporated both the observed ratio and extreme ratios derived from other studies to generate global emission totals of HCN via biomass burning. Using the ratio derived from this work, the emission total for HCN from BB was 0.92 Tg (N) yr−1.