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We present setup, testing and initial results from a new automated systemfor stable carbon isotope ratio measurements on C2 to C6 atmospherichydrocarbons. The inlet system allows analysis of trace gasesfrom air samples ranging from a few liters for urban samples and sampleswith high mixing ratios, to many tens of liters for samples from remoteunpolluted regions with very low mixing ratios. The centerpiece of thesample preparation is the separation trap, which is used to separateCO2 and methane from the compounds of interest. The main features ofthe system are (i) the capability to sample up to 300 l of air, (ii) long term (since May 2009) operational δ13C accuracy levels inthe range 0.3–0.8 ‰ (1-σ), and (iii) detection limits of order1.5–2.5 ngC (collected amount of substance) for all reported compounds. The first application of this system was the analysis of 21 ambient airsamples taken during 48 h in August 2009 in Utrecht, the Netherlands.Results obtained are generally in good agreement with those from similarurban ambient air studies. Short sample intervals allowed by the design ofthe instrument help to illustrate the complex diurnal behavior ofhydrocarbons in an urban environment, where diverse sources, dynamicalprocesses, and chemical reactions are present

atmospheric measurement techniques

Analytical system for stable carbon isotope measurements of low molecular weight (C&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;-C&amp;lt;sub&amp;gt;6&amp;lt;/sub&amp;gt;) hydrocarbons