Berlin 2012 – scientific programme

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UP: Fachverband Umweltphysik

UP 14: Atmosphere 2

UP 14.9: Talk

Thursday, March 29, 2012, 16:45–17:00, HFT-FT 131

Ground based remote sensing of CO₂ and CH₄ using a mobile Bruker 120M FTIR spectrometer — •Christof Petri, Thorsten Warneke, Christine Weinzierl, and Justus Notholt — Institute of Environmental Physics, University of Bremen, Bremen, Germany

Throughout the last years the solar absorption spectrometry has been further developed to measure CO₂ and CH₄ with sufficient precision to contribute to the understanding of the cycle of these greenhouse gases. Such measurements are performed within the global “ Total Carbon Column Observing Network ” ( TCCON ), which was established in 2004. The observations within TCCON are performed in the near infrared spectral region using the high resolution Bruker 120 HR or 125 HR laboratory type interferometers. These instruments are quite large and expensive. For many applications mobile instruments would be required. However, up to now the required precision has not been demonstrated for mobile instruments. We performed observations using a mobile Bruker 120 M interferometer which is able to derive spectra with a resolution of 0.02 cm⁻¹ as typically used in the TCCON network. The measurements have been performed in Bremen and compared to our observations using a Bruker 125 HR interferometer, which is part of the TCCON network. The observations have been performed for several months under different meteorological conditions. The retrieved results show that the instrument agrees within 0.2 % to the TCCON observations and that a precision of 0.3 % can be reached.