title: Multifilter rotating shadowband radiometer calibration for spectral aerosol optical depth retrievals over São Paulo City, Brazil.
abstract: Multifilter rotating shadowband radiometer (MFRSR) calibration values for aerosol optical depth (AOD) retrievals were determined by means of the general method formulated by Forgan [Appl. Opt.33, 4841 (1994)] at a polluted urban site. The obtained precision is comparable with the classical method, the Langley plot, applied on clean mountaintops distant of pollution sources. The AOD retrieved over São Paulo City with both calibration procedures is compared with the Aerosol Robotic Network data. The observed results are similar, and, except for the shortest wavelength (415 nm), the MFRSR's AOD is systematically overestimated by approximately 0.03.
authors: Institute of Astronomy, Geophysics and Atmospheric Sciences, University of São Paulo, Rua do Matão 1226, São Paulo, SP, Brazil. nrosario@model.iag.usp.br
authors: Nilton
authors: N
authors: do Rosário
authors: Márcia Akemi
authors: MA
authors: Yamasoe
authors: André
authors: A
authors: Sayão
authors: Ricardo
authors: R
authors: Siqueira