| Volumes and Issues Contents of Issue 3 |
www.atmos-meas-tech-discuss.net/3/2225/2010/
doi:10.5194/amtd-3-2225-2010
© Author(s) 2010. This work is distributed
under the Creative Commons Attribution 3.0 License.
Fast and simple model for atmospheric radiative transfer
1Remote Sensing Laboratories, University of Zurich, Winterthurerstr. 190, 8057 Zurich, Switzerland
2Institute of Environmental Physics, University of Bremen, O. Hahn Allee 1, 28334 Bremen, Germany
Abstract. Radiative transfer models (RTMs) are of utmost importance for quantitative remote sensing, especially for compensating atmospheric perturbation. A persistent trade-off exists between approaches that prefer accuracy at the cost of computational complexity, versus those favouring simplicity at the cost of reduced accuracy. We propose an approach in the latter category, using analytical equations, parameterizations and a correction factor to efficiently estimate the effect of molecular multiple scattering. We discuss the approximations together with an analysis of the resulting performance and accuracy. The proposed Simple Model for Atmospheric Radiative Transfer (SMART) decreases the calculation time by a factor of more than 25 in comparison to the benchmark RTM~6S on the same infrastructure. The approximative computation of the atmospheric reflectance factor by SMART has an uncertainty ranging from about 5% to 10% for nadir spaceborne and airborne observational conditions. The combination of a large solar zenith angle (SZA) with high aerosol optical depth (AOD) at low wavelengths lead to uncertainties of up to 15%. SMART can be used to simulate the hemispherical conical reflectance factor (HCRF) for spaceborne and airborne sensors, as well as for the retrieval of columnar AOD.
Discussion Paper (PDF, 4853 KB) Interactive Discussion (Closed, 6 Comments) Final Revised Paper (AMT)
Notice on Discussion StatusCitation: Seidel, F. C., Kokhanovsky, A. A., and Schaepman, M. E.: Fast and simple model for atmospheric radiative transfer, Atmos. Meas. Tech. Discuss., 3, 2225-2273, doi:10.5194/amtd-3-2225-2010, 2010. Bibtex EndNote Reference Manager XML
