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A DUALER (dual-channel airborne peroxy radical chemical amplifier)instrument has been developed and optimised for the airborne measurement ofthe total sum of peroxy radicals during the AMMA (African MonsoonMultidisciplinary Analyses) measurement campaign which took place in BurkinaFaso in August 2006. The innovative feature of the instrument is that bothreactors are sampling simultaneously from a common pre-reactor nozzle whilethe whole system is kept at a constant pressure to ensure more signalstability and accuracy. Laboratory experiments were conducted to characterise the stability of theNO2 detector signal and the chain length with the pressure. The resultsshow that airborne measurements using chemical amplification requireconstant pressure at the luminol detector. Wall losses of main peroxyradicals HO2 and CH3O2 were investigated. The chain lengthwas experimentally determined for different ambient mixtures and comparedwith 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 theO3 mixing ratios simultaneously measured onboard. The validation andanalysis procedure is illustrated by means of the data measured during theAMMA campaign. The detection limit and the accuracy of the ambientmeasurements are also discussed

Technical Note: Characterisation of a DUALER instrument for the airborne measurement of peroxy radicals during AMMA 2006