Abstract
High resolution mid‐infrared limb emission spectra observed by the spaceborne Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) showing evidence of cloud interference are analyzed. Using the new line‐by‐line multiple scattering [Approximate] Spherical Atmospheric Radiative Transfer code (SARTre), a sensitivity study with respect to cirrus cloud parameters, e.g., optical thickness and particle size distribution, is performed. Cirrus properties are estimated by fitting spectra in three distinct microwindows between 8 and 12 μm. For a cirrus with extremely low ice water path (IWP = 0.1 g/m2) and small effective particle size (De = 10 μm) simulated spectra are in close agreement with observations in broadband signal and fine structures. We show that a multi‐microwindow technique enhances reliability of MIPAS cirrus retrievals compared to single microwindow methods.
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