Towards Optimal Aerosol Information for the Retrieval of Solar Surface Radiation Using HeliosatReportar como inadecuado




Towards Optimal Aerosol Information for the Retrieval of Solar Surface Radiation Using Heliosat - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Deutscher Wetterdienst, Frankfurter Str. 135, D-60387 Offenbach, Germany





*

Author to whom correspondence should be addressed.



Academic Editor: Sundar Christopher

Abstract High quality data of surface radiation is a prerequisite for climate monitoring Earth radiation budget and solar energy applications. A very common method to derive solar surface irradiance is the Heliosat method, a one channel approach for the retrieval of the effective cloud albedo CAL. This information is then used to derive the solar surface irradiance by application of a clear sky model. The results of this study are based on radiative transfer modelling, visual inspection of satellite images and evaluation of satellite based solar surface radiation with ground measurements. The respective results provide evidence that variations in Aerosol Optical depth induced by desert storms and biomass burning events lead to a significant increase of the effective cloud albedo, thus, that certain aerosol events are interpreted as clouds by the method. For the estimation of the solar surface radiation aerosol information is needed as input for the clear sky model. As the aerosol effect is partly considered by CAL, there is a need to modify external aerosol information for the use within the clear sky model, e.g., by truncation of high aerosol loads. Indeed, it has been shown that a modified version of the Monitoring Atmospheric Composition and Climate MACC aerosol information leads to better accuracy of the retrieved solar surface radiation than the original MACC data for the investigated 9 sites and time period 2006–2009. Further, the assumption of a constant aerosol optical depth of 0.18 provides also better accuracies of the estimated solar surface radiation than the original MACC data for the investigated sites and period. It is concluded that this is partly due to the consideration of scattering aerosols by the effective cloud albedo. View Full-Text

Keywords: solar surface radiation; radiative transfer modeling; interactions with atmosphere; cloud albedo retrieval; aerosol effect; aerosol clouds solar surface radiation; radiative transfer modeling; interactions with atmosphere; cloud albedo retrieval; aerosol effect; aerosol clouds





Autor: Richard Mueller * , Uwe Pfeifroth and Christine Traeger-Chatterjee

Fuente: http://mdpi.com/



DESCARGAR PDF




Documentos relacionados