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The CARIBIC project (Civil Aircraft for the Regular Investigation of theatmosphere Based on an Instrument Container) is a long-term monitoringprogram making regular atmospheric measurements from an instrument containerinstalled monthly aboard a passenger aircraft. Typical cruising altitudes ofthe aircraft allow for the study of the free troposphere and theextra-tropical upper troposphere as well as the lowermost stratosphere.CARIBIC measurements include a number of real time analyses as well as thecollection of aerosol and whole air samples. These whole air samples areanalyzed post-flight for a suite of trace gases, which includes non-methanehydrocarbons (NMHC). The NMHC measurement system and its analytical performance are describedhere. Precision was found to vary slightly by compound, and is less than2% for the C2–C6 alkanes and ethyne, and between 1% and6% for C7–C8 alkanes and aromatic compounds. Preliminaryresults from participation in a Global Atmospheric Watch (WMO) VOC auditindicate accuracies within the precision of the system. Limits of detectionare 1 pptv for most compounds, and up to 3 pptv for some aromatics. Theseare sufficiently low to measure mixing ratios typically observed in theupper troposphere and lowermost stratosphere for the longer-lived NMHC,however, in air samples from these regions many of the compounds withshorter lifetimes (<5 days) were frequently below the detection limit.Observed NMHC concentrations span several orders of magnitude, dependent onatmospheric region and air mass history, with concentrations typicallydecreasing with shorter chemical lifetimes

Analysis of non-methane hydrocarbons in air samples collected aboard the CARIBIC passenger aircraft