Berlin 2014 – wissenschaftliches Programm

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UP: Fachverband Umweltphysik

UP 11: Postersession

UP 11.2: Poster

Mittwoch, 19. März 2014, 17:00–18:30, MAG Poster

Remote sensing of methane with optical correlation spectroscopy on the Q-branch of the 2ν3 band — •Katja Rieth^1,3, Christophe Anselmo¹, Benjamin Thomas², Jean-Pierre Cariou⁴, Alain Miffre¹, Johannes Orphal³, and Patrick Rairoux¹ — ¹Institut Lumière Matière (ILM), Université Lyon 1, CNRS, Lyon, France — ²Center for Advanced Technology (CAT), City University New York, USA — ³Institute for Meteorology and Climate Research Research (IMK), Karlsruhe Institute of Technology (KIT) , Germany — ⁴Leosphere, Orsay, France

We propose a study on the ability to realize accurate remote sensing of greenhouse gases concentration in the Earth's atmosphere by applying broadband optical correlation spectroscopy (OCS) with Acoustic Optical Programmable Dispersive Filter (AOPDF) [1]. Our study focuses on the 2ν3 methane absorption band, centered at the 1665 nm wavelength. Studies have been achieved to assess the accuracy on the retrieved methane-mixing ratio when applying the OCS-AOPDF methodology. We will show that atmospheric temperature gradient induces a systematic error on the retrieved methane-mixing ratio and that methane-mixing ratios are weakly sensitive to the pressure broadening of the absorption line and to the statistical variation of the absorption line strength [2]. References [1] B. Thomas, A. Miffre, G. David, C. Anselmo, J.P. Cariou and P. Rairoux, App. Phys. B, 113, 265-275, (2013). [2] B. Thomas, A. Miffre, G. David, C. Anselmo, E. Coillet, J.P. Cariou and P. Rairoux, , J. Mol. Spec., 293, 3-8,(2013).