Real-time analysis of δ13C- and δD-CH4 in ambient air with laser spectroscopy: Method development and intercomparison

Simon Eyer1, Joachim Mohn2, Thomas Röckmann3, Elena Popa4, David Lowry5, Euan G Nisbet5, Rebecca Elizabeth Fisher6, Matthias Stefan Brennwald7, Hubertus Fischer8, Lukas Emmenegger9, Béla Tuzson1, Christoph Zellweger2 and Eliza J Harris2, (1)Empa, Laboratory for Air Pollution & Environmental Technology, Duebendorf, Switzerland, (2)Empa, Laboratory for Air Pollution / Environmental Technology, Dübendorf, Switzerland, (3)Utrecht University, Utrecht, Netherlands, (4)Utrecht University, Institute for Marine and Atmospheric research Utrecht, Utrecht, Netherlands, (5)Royal Holloway, University of London, Department of Earth Sciences, Egham, United Kingdom, (6)Royal Holloway, Univ London, Egham, United Kingdom, (7)EAWAG Swiss Federal Institute of Aquatic Science and Technology, Dübendorf, Switzerland, (8)University of Bern, Bern, Switzerland, (9)Empa, Swiss Federal Laboratories for Materials Science and Technology, Duebendorf, Switzerland