20 October 1999 Retrieval of water vapor in the upper troposphere/lower stratosphere from MIPAS/Envisat limb emission spectra
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Abstract
Global Measurements of water vapor in the upper troposphere and lower stratosphere (UT/LS) are required to assess its influence on the radiation budget of the Earth and for its use as a suitable tracer for the study of troposphere-stratosphere exchange processes (STE). MIPAS (Michelson Interferometer for Passive Atmospheric Sounding) is a Fourier transform spectrometer measuring limb emission spectra. The field of view of the satellite-borne MIPAS/Envisat is rather wide compared to horizontal and vertical structures in real water vapor distributions (e.g. hygropause). Our aim is to derive UT/LS water vapor profiles from MIPAS/Envisat data with optimized spatial resolution and accuracy. The retrieval errors and vertical resolution were assessed in an altitude- range 5 - 25 km with respect to a MIPAS standard observation scenario and the retrieval of the water vapor profile to be performed on the measurement grid. As target parameters we used water vapor and continuum in the first case and water vapor, temperature and continuum in the second scenario. Improvements by joint retrieval of water vapor and temperature are investigated, in particular for saturated H2O- signatures originating from the troposphere. The vertical resolution was estimated by the use of so-called averaging kernels.
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Mathias Milz, Mathias Milz, Thomas von Clarmann, Thomas von Clarmann, Gabriele P. Stiller, Gabriele P. Stiller, Herbert Fischer, Herbert Fischer, } "Retrieval of water vapor in the upper troposphere/lower stratosphere from MIPAS/Envisat limb emission spectra", Proc. SPIE 3756, Optical Spectroscopic Techniques and Instrumentation for Atmospheric and Space Research III, (20 October 1999); doi: 10.1117/12.366414; https://doi.org/10.1117/12.366414
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