Technical Note: Characterisation of a DUALER instrument for the airborne measurement of peroxy radicals during AMMA 2006
Technical Note: Characterisation of a DUALER instrument for the airborne measurement of peroxy radicals during AMMA 2006
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DOI：
10.5194/acp-10-3047-2010
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发表时间：
2009-09
影响因子：
6.3
通讯作者：
D. Kartal;M. Andrés-Hernández;L. Reichert;H. Schlager;J. Burrows
中科院分区：
文献类型：
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作者：
D. Kartal;M. Andrés-Hernández;L. Reichert;H. Schlager;J. Burrows
抽象。为了在2006年8月在布基纳法索进行的非洲季风多学科分析测量活动期间对过氧自由基总量进行空中测量，开发并优化了DUALER（双通道空中过氧自由基化学放大器）仪器。该仪器的创新特点是两个反应器同时从一个共同的预反应器喷嘴取样，同时整个系统保持恒定的压力，以确保更高的信号稳定性和准确性。实验研究了NO2检测器信号的稳定性和分子链长度随压力的变化规律。结果表明，使用化学放大的机载测量需要在鲁米诺检测器处保持恒定的压力。研究了主要过氧自由基HO 2和CH 3 O2的壁损失。链长的实验确定为不同的环境混合物，并进行了比较与模拟的化学箱模型。DUALER仪器已成功安装在德国DLR-Falcon上。AMMA数据的分析利用了基于同时测量的O3混合比的验证程序。验证和分析程序说明了AMMA活动期间测量的数据。本文还讨论了环境测量的检出限和准确度。
Abstract. A DUALER (dual-channel airborne peroxy radical chemical amplifier) instrument has been developed and optimised for the airborne measurement of the total sum of peroxy radicals during the AMMA (African Monsoon Multidisciplinary Analyses) measurement campaign which took place in Burkina Faso in August 2006. The innovative feature of the instrument is that both reactors are sampling simultaneously from a common pre-reactor nozzle while the whole system is kept at a constant pressure to ensure more signal stability and accuracy. Laboratory experiments were conducted to characterise the stability of the NO2 detector signal and the chain length with the pressure. The results show that airborne measurements using chemical amplification require constant pressure at the luminol detector. Wall losses of main peroxy radicals HO2 and CH3O2 were investigated. The chain length was experimentally determined for different ambient mixtures and compared with simulations performed by a chemical box model. The DUALER instrument was successfully mounted within the German DLR-Falcon. The analysis of AMMA data utilises a validation procedure based on the O3 mixing ratios simultaneously measured onboard. The validation and analysis procedure is illustrated by means of the data measured during the AMMA campaign. The detection limit and the accuracy of the ambient measurements are also discussed.