Rotational Raman scattering and the ring effect in zenith-sky spectra

1995 ◽  
Vol 22 (7) ◽  
pp. 811-814 ◽  
Author(s):  
D. J. Fish ◽  
R. L. Jones
Keyword(s):  
Raman Scattering ◽  
Ring Effect

scholarly journals A new method for the simulation of the Ring effect in observations of scattered sun light

2009 ◽  
Vol 2 (1) ◽  
pp. 87-118 ◽  
Author(s):  
T. Wagner ◽  
S. Beirle ◽  
T. Deutschmann
Keyword(s):  
Radiative Transfer ◽  
Raman Scattering ◽  
Scattered Light ◽  
Satellite Observation ◽  
Quantitative Agreement ◽  
New Method ◽  
New Technique ◽  
Spectral Interval ◽  
Scattering Probability ◽  
Ring Effect

Abstract. We present a new technique for the quantitative simulation of the "Ring effect" for scattered light observations from various platforms and under different atmospheric situations. The method is based on radiative transfer calculations at only one wavelength λ0 in the wavelength range under consideration, and is thus computationally fast. The strength of the Ring effect is calculated from statistical properties of the photon paths for a given situation, which makes Monte Carlo radiative transfer models in particular appropriate. We quantify the Ring effect by the so called rotational Raman scattering probability, the probability that an observed photon has undergone a rotational Raman scattering event. The Raman scattering probability is independent from the spectral resolution of the instrument and can easily be converted into various definitions used to characterise the strength of the Ring effect. We compare the results of our new method to the results of previous studies and in general good quantitative agreement is found. In addition to the simulation of the Ring effect, we developed a detailed retrieval strategy for the analysis of the Ring effect based on DOAS retrievals, which allows the precise determination of the strength of the Ring effect for a specific wavelength while using the spectral information within a larger spectral interval around the selected wavelength. Using our new technique, we simulated synthetic satellite observation of an atmospheric scenario with a finite cloud illuminated from different sun positions.

scholarly journals Three-dimensional simulation of the Ring effect in observations of scattered sun light using Monte Carlo radiative transfer models

2009 ◽  
Vol 2 (1) ◽  
pp. 113-124 ◽  
Author(s):  
T. Wagner ◽  
S. Beirle ◽  
T. Deutschmann
Keyword(s):  
Monte Carlo ◽  
Radiative Transfer ◽  
Raman Scattering ◽  
Scattered Light ◽  
Satellite Observation ◽  
Spectral Interval ◽  
Radiative Transfer Models ◽  
Scattering Probability ◽  
Transfer Models ◽  
Ring Effect

Abstract. We present a new technique for the quantitative simulation of the "Ring effect" for scattered light observations from various platforms and under different atmospheric situations. The method is based on radiative transfer calculations at only one wavelength λ0 in the wavelength range under consideration, and is thus computationally fast. The strength of the Ring effect is calculated from statistical properties of the photon paths for a given situation, which makes Monte Carlo radiative transfer models in particular appropriate. We quantify the Ring effect by the so called rotational Raman scattering probability, the probability that an observed photon has undergone a rotational Raman scattering event. The Raman scattering probability is independent from the spectral resolution of the instrument and can easily be converted into various definitions used to characterise the strength of the Ring effect. We compare the results of our method to the results of previous studies and in general good quantitative agreement is found. In addition to the simulation of the Ring effect, we developed a detailed retrieval strategy for the analysis of the Ring effect based on DOAS retrievals, which allows the precise determination of the strength of the Ring effect for a specific wavelength while using the spectral information within a larger spectral interval around the selected wavelength. Using our technique, we simulated synthetic satellite observation of an atmospheric scenario with a finite cloud illuminated from different sun positions. The strength of the Ring effect depends systematically on the measurement geometry, and is strongest if the satellite points to the side of the cloud which lies in the shadow of the sun.

Rotational Raman scattering (Ring effect) in satellite backscatter ultraviolet measurements

1995 ◽  
Vol 34 (21) ◽  
pp. 4513 ◽  
Author(s):  
Joanna Joiner ◽  
Pawan K. Bhartia ◽  
Richard P. Cebula ◽  
Ernest Hilsenrath ◽  
Richard D. McPeters ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Ring Effect

Ground-based Ring-effect measurements with the OSIRIS development model

2002 ◽  
Vol 80 (4) ◽  
pp. 483-491 ◽  
Author(s):  
C E Sioris ◽  
W FJ Evans ◽  
R L Gattinger ◽  
I C McDade ◽  
D A Degenstein ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Spectral Resolution ◽  
Solar Zenith Angle ◽  
Infrared Imaging ◽  
Imaging System ◽  
Solar Spectrum ◽  
Development Model ◽  
Infrared Imaging System ◽  
Uv Visible ◽  
Ring Effect

The Ring effect is measured using the UV–visible spectrometer (~1 nm spectral resolution) of OSIRIS, the optical spectrograph and infrared imaging system. The observed filling in of Ca(II) H and K (~395 nm), the two largest Fraunhofer lines in the solar spectrum, are compared with the filling in simulated with a new model that includes rotational Raman scattering (RRS) by N2 and O2. The filling in is (1.06 ± 0.60)% at Ca(II) K and (1.40 ± 0.50)% at Ca(II) H for blue-sky observations at a solar zenith angle of 37°. The measured filling in agrees with the modelled filling in within the uncertainties. PACS Nos.: 07.60Rd, 33.20Fb, 42.68Ay, 42.68Ca, 42.68Ge, 42.68Mj

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