Calculating Radiative Characteristics with the Single Scattering Approximation

Kuznetsov, Anatoly; Melnikova, Irina; Pozdnyakov, Dmitriy; Seroukhova, Olga; Vasilyev, Alexander

doi:10.1007/978-3-642-14899-6_14

Cited by 1 publication

(2 citation statements)

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“…The relative reflectivity normalized by the reflectivity without the ultraviolet absorber for zero incidence and emission angles is given by

α = \frac{\int_{0}^{z_{top}} σ_{cloud} n_{cloud} ((), z) exp ([], - 2 \int_{z}^{z_{top}} ((), σ_{cloud} n_{cloud} ((), z^{'}) + σ_{UV} n_{UV} ((), z^{'})) d z^{'}) italicdz}{\int_{0}^{z_{top}} σ_{cloud} n_{cloud} ((), z) exp ([], - 2 \int_{z}^{z_{top}} σ_{cloud} n_{cloud} ((), z^{'}) d z^{'}) italicdz},

where n cloud and n UV are the perturbed total densities (

n_{i} = {\overset{true¯}{n}}_{i} + n_{i}^{'}

), σ cloud is the scattering cross‐section of cloud particles, σ UV is the absorption cross‐section of the ultraviolet absorber, and z top (=100 km) is the upper boundary of the model where n cloud and n UV are negligibly low. The numerator is proportional to the upward intensity with the source function replaced by one that ignores the scattering of the diffuse field but retains the scattering of the incident solar radiation (e.g., Chamberlain & Hunten, ; Kuznetsov et al, ). The σ cloud n cloud ( z ) term that first appears in the integrand is the scattering cross‐section of the clouds per unit volume at the altitude z where the radiation to be observed is scattered, the exponential term gives the attenuation along the incoming and outgoing paths, and the integration is performed from z to the top of the atmosphere.…”

Section: Response Of the Cloud Top Atmosphere To A Gravity Wavementioning

confidence: 99%

“…The latter is satisfied as shown later. The scattering of the solar ultraviolet radiation by the cloud is modeled with a single-scattering approximation (Kuznetsov et al, 2012). This approximation is valid for an optically thin atmosphere; a complete radiative transfer calculation including the effect of multiple scattering (e.g., Lee et al, 2017;Pérez-Hoyos et al, 2018), which is needed for Venusian clouds, is left for future studies.…”

Section: Journal Of Geophysical Research: Planetsmentioning

confidence: 99%

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Stationary Features at the Cloud Top of Venus Observed by Ultraviolet Imager Onboard Akatsuki

et al. 2019

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Stationary features indicative of topographic gravity waves were identified at the cloud top of Venus with the 283‐nm channel of the Ultraviolet Imager (UVI) onboard Akatsuki, and their geographical and local time dependences were studied. At this wavelength the absorption by SO2 dominates. To extract stationary structures with respect to the surface, we averaged multiple images to smooth out moving features and applied high‐pass filtering to emphasize small structures. We found that stationary features appear exclusively above highlands and that they tend to appear between noon and evening. The stationary features seem to be synchronized with those observed in the cloud top temperature maps taken by the Longwave Infrared Camera (LIR). It was shown using a gravity wave model that the scale height of SO2 should be smaller than that of the cloud around the cloud top to reproduce the observed phase relationship between the stationary features seen in the Ultraviolet Imager and Longwave Infrared Camera images.

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“…The relative reflectivity normalized by the reflectivity without the ultraviolet absorber for zero incidence and emission angles is given by