Atmospheric Measurement Techniques www.atmos-meas-tech.net 1867-1381 1867-8548 2 2 2009 10.5194/amt-2-609-2009 http://www.atmos-meas-tech.net/2/609/2009/ http://www.atmos-meas-tech.net/2/609/2009/amt-2-609-2009.html http://www.atmos-meas-tech.net/2/609/2009/amt-2-609-2009.pdf 609 619 2009-10-28 Ground-based FTIR water vapour profile analyses M. Schneider matthias.schneider@imk.fzk.de F. Hase IMK-ASF, Forschungszentrum Karlsruhe und Universität Karlsruhe, Karlsruhe, Germany Due to a large vertical gradient and strong variability of water vapour, algorithms that are effectively applied for ground-based remote sensing of many different atmospheric trace gases can be insufficient for the retrieval of tropospheric water vapour profiles. We review the most important features of the retrieval and of the radiative transfer modelling required for accurate monitoring of tropospheric water vapour profiles by ground-based FTIR (Fourier Transform Infrared) experiments. 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