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An airborne chemical ionization ion trap mass spectrometer instrument (CI-ITMS) has beendeveloped for tropospheric and stratospheric fast in-situ measurements of PAN (peroxyacetylnitrate) and PPN (peroxypropionyl nitrate). The first scientific deployment of the FASTPEXinstrument (FASTPEX = Fast Measurement of Peroxyacyl nitrates)took place in the Arctic during 18 missions aboard the DLR research aircraft Falcon, withinthe framework of the POLARCAT-GRACE campaign in the summer of 2008. The FASTPEX instrumentis described and characteristic properties of the employed ion trap mass spectrometer arediscussed. Atmospheric data obtained at altitudes of up to ~12 km are presented,from the boundary layer to the lowermost stratosphere. Data were sampled with a timeresolution of 2 s and a 2σ detection limit of 25 pmol mol−1. An isotopicallylabelled standard was used for a permanent on-line calibration. For this reason the accuracyof the PAN measurements is better than ±10% for mixing ratios greater than200 pmol mol−1. PAN mixing ratios in the summer Arctic troposphere were in the orderof a few hundred pmol mol−1 and generally correlated well with CO. In the Arcticboundary layer and lowermost stratosphere smaller PAN mixing ratios were observed due toa combination of missing local sources of PAN precursor gases and efficient removalprocesses (thermolysis/photolysis). PPN, the second most abundant PAN homologue, wasmeasured simultaneously. Observed PPN/PAN ratios range between ~0.03 and 0.3

An aircraft-borne chemical ionization – ion trap mass spectrometer (CI-ITMS) for fast PAN and PPN measurements