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Browsing by Subject "Turbulenz"

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    High-resolution measurements of temperature and humidity fields in the atmospheric boundary layer with scanning rotational Raman lidar
    (2016) Hammann, Eva; Wulfmeyer, Volker
    The Institute of Physics and Meteorology of the University of Hohenheim (UHOH) operates a scanning rotational Raman lidar (RRL) for high-resolution temperature and water vapor measurements. The measurement performance of the RRL was improved in several aspects. The statistical error of temperature measurements was reduced by up to 70% through optimization of the filter passbands for various solar background conditions. The optimization method, based on detailed simulations, was written for one specific wavelength and was not applicable to other Raman lidar systems. Therefore the simulation results were parametrized in respect to temperature and background level and expressed in units of wavenumbers. A new interference filter transmitting rotational Raman lines near the excitation wavelength was installed, resulting in a higher transmission and eliminating possible leakage signal. A detection channel for the vibrational Raman line of water vapor was added for the retrieval of water vapor mixing ratios during day-and nighttime. More than 300 hours of temperature and more than 200 hours of water vapor measurements were performed and the acquired profiles used in several publications. Atmospheric variance and higher order moment profiles of the daytime atmospheric boundary layer were derived.
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    Large eddy simulations of the thermodynamic budgets in a small catchment
    (2020) Adam, Stephan; Wulfmeyer, Volker
    In this study, the regional water and energy budgets at the land surface and the planetary boundary layer (PBL) were simulated for three different real case studies. Nested large eddy simulation (LES) experiments with the WRF-NOAHMP-HYDRO model were conducted for real cases. The LES was operated for two different sites, the Kraichgau and the Ammer catchment which are both located in the southwest of Germany, covering one full diurnal cycle for each case study.