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. Simultaneous measurement of C2H6 and CH4 concentrations, and of the δ13C - CH4 isotope ratio isdemonstrated using a cavity-enhanced absorption spectroscopy technique inthe mid-IR region. The spectrometer is compact and has been designed forfield operation. It relies on optical-feedback-assisted injection of3.3  µ m radiation from an interband cascade laser (ICL) into a V-shapedhigh-finesse optical cavity. A minimum absorption coefficient of 2.8 × 10 - 9  cm −1 is obtained in a single scan (0.1 s) over 0.7 cm −1 . Precisions of 3 ppbv, 11 ppbv, and 0.08 ‰ for C2H6 , CH4 , and δ13C - CH4 , respectively, areachieved after 400 s of integration time. Laboratory calibrations and testsof performance are reported here. They show the potential for thespectrometer to be embedded in a sensor probe for in situ measurements in oceanwaters, which could have important applications for the understanding of thesource and fate of hydrocarbons from the seabed and in the water column.

atmospheric measurement techniques

Simultaneous detection of C&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;H&amp;lt;sub&amp;gt;6&amp;lt;/sub&amp;gt;, CH&amp;lt;sub&amp;gt;4&amp;lt;/sub&amp;gt;, and &amp;lt;i&amp;gt;δ&amp;lt;/i&amp;gt;&amp;lt;sup&amp;gt;13&amp;lt;/sup&amp;gt;C-CH&amp;lt;sub&amp;gt;4&amp;lt;/sub&amp;gt; using optical feedback cavity-enhanced absorption spectroscopy in the mid-infrared region: towards application for dissolved gas measurements