Bernhard Mayer

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A solar eclipse is a rare but spectacular natural phenomenon and furthermore it is a challenge for radiative transfer modelling. Whereas a simple one-dimensional radiative transfer model with reduced solar irradiance at the top of the atmosphere can be used to calculate the brightness during partial eclipses a much more sophisticated model is required to(More)
The Monte Carlo code for the physically correct tracing of photons in cloudy atmospheres (MYSTIC) three-dimensional radiative transfer model was used in a parametric study to determine the strength of longwave radiative heating and cooling in atmospheres enclosed in idealized valleys and basins. The parameters investigated included valley or basin shape,(More)
Although solar radiation initially is unpolarized when entering the Earth’s atmosphere, it is polarized by scattering processes with molecules, water droplets, ice crystals, and aerosols. Hence, measurements of the polarization state of radiation can be used to improve remote sensing of aerosols and clouds. The analysis of polarized radiance measurements(More)
Aerosols play an important role in atmospheric physics. The airborne particles in diameters of a few nanometres to some micrometres affect the climate system by altering the energy balance of the atmosphere. However, the quantification of the climate effect is an open question until today. Large uncertainties exist in the knowledge of the global aerosol(More)
The diurnal and annual variability of solar UV radiation in Europe is described for different latitudes, seasons and different biologic weighting functions. For the description of this variability under cloudless skies the widely used one-dimensional version of the radiative transfer model UVSPEC is used. We reconfirm that the major factor influencing the(More)
Eighteen radiative transfer models in use for calculation of UV index are compared with respect to their results for more that 100 cloud-free atmospheres, which describe present, possible future and extreme conditions. The comparison includes six multiple-scattering spectral models, eight fast spectral models and four empirical models. Averages of the(More)
[1] This paper evaluates global mean radiatively important properties of chemistry climate models (CCMs). We evaluate stratospheric temperatures and their 1980–2000 trends, January clear sky irradiances, heating rates, and greenhouse gas radiative forcings from an offline comparison of CCM radiation codes with line‐by‐line models, and CCMs’ representation(More)
  • Bernhard Mayer
  • Wilhelm Roux' Archiv für Entwicklungsmechanik der…
  • 2005
Inhaltsiibersicht. seite I. Einleitung . . . . . . . . . . . . . . . . . . . . . . . . . . . . 518 II. Material und Methoden . . . . . . . . . . . . . . . . . . . . . . 521 I I I . Experimenteller Tell . . . . . . . . . . . . . . . . . . . . . . . 524 1. Seitliche Transplan~ate aus der jungen Gastrula . . . . . . . . . 524 a) Darstellung der Experimente . .(More)
libRadtran is a widely used software package for radiative transfer calculations. It allows one to compute (polarized) radiances, irradiance, and actinic fluxes in the solar and thermal spectral regions. libRadtran has been used for various applications, including remote sensing of clouds, aerosols and trace gases in the Earth’s atmosphere, climate studies,(More)
For many cases modeled and measured UV global irradiances agree to within +/-5% for cloudless conditions, provided that all relevant parameters for describing the atmosphere and the surface are well known. However, for conditions with snow-covered surfaces this agreement is usually not achievable, because on the one hand the regional albedo, which has to be(More)