Importance of direct anthropogenic emissions of formic acid measured by a chemical ionisation mass spectrometer (CIMS) during the Winter ClearfLo Campaign in London, January 2012
Importance of direct anthropogenic emissions of formic acid measured by a chemical ionisation mass spectrometer (CIMS) during the Winter ClearfLo Campaign in London, January 2012
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DOI：
10.1016/j.atmosenv.2013.10.029
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发表时间：
2014-02-01
影响因子：
5
通讯作者：
Percival, Carl J.
中科院分区：
文献类型：
--
作者：
Bannan, Thomas J.;Bacak, Asan;Percival, Carl J.
在2012年伦敦的冬季ClearfLo活动期间，使用化学电离质谱仪（CIMS）测量了大气中普遍存在的痕量气体甲酸。甲酸的每日校准得到的灵敏度为3个离子计数s（-1）pptv（-1），用于整个活动，检测限为2 ppt。未观察到与硝酸的相关性，R-2为0.137，表明甲酸无显著的次要来源。然而，一个强有力的正相关性与氮氧化物，一氧化碳，生产线与高峰时段表示直接人为排放的甲酸从车辆排放。观测到甲酸峰值为6.7 ppb，平均值为610 ppt。全球模型表明，这种排放源在北方半球占主导地位，在那里全球模型低估了甲酸的最大程度，从而提高了全球甲酸排放建模的准确性。(C)2013由Elsevier Ltd.出版
Formic acid, an ubiquitous trace gas in the atmosphere, was measured using a chemical ionisation mass spectrometer (CIMS) during the winter ClearfLo campaign in London, 2012. Daily calibrations of formic acid gave sensitivities of 3 ion counts s(-1) pptv(-1) for the complete campaign and a limit of detection of 2 ppt. No correlation with nitric acid was observed, R-2 of 0.137, indicating no significant secondary source of formic acid. However, a strong positive correlation with NOx, CO, and production in line with rush hour periods indicated a direct anthropogenic emission of formic acid from vehicle emissions. Peaks of 6.7 ppb of formic acid were observed with a mean of 610 ppt Global models indicated that this emission source dominates in the northern hemisphere where global models underestimate formic acid most significantly, thus increasing the accuracy of modelling of global formic acid emissions. (C) 2013 Published by Elsevier Ltd.