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We present a new correction scheme for filter-based absorption photometersbased on a constrained two-stream (CTS) radiative transfer model andexperimental calibrations. The two-stream model was initialized usingexperimentally accessible optical parameters of the filter. Experimentalcalibrations were taken from the literature and from dedicated experiments forthe present manuscript. Uncertainties in the model and calibrationexperiments are discussed and uncertainties for retrieval of absorptioncoefficients are derived. For single-scattering albedos lower than 0.8, thenew CTS method and also other correction schemes suffer from the uncertaintyin calibration experiments, with an uncertainty of about 20% in theabsorption coefficient. For high single-scattering albedos, the CTS correctionsignificantly reduces errors. At a single-scattering albedo of about 0.98 theerror can be reduced to 30%, whereas errors using the Bond correction(Bond et al., 1999) are up to 100%. The correction scheme was testedusing data from an independent experiment. The tests confirm the modeledperformance of the correction scheme when comparing the CTS method to other establishedcorrection methods

Constrained two-stream algorithm for calculating aerosol light absorption coefficient from the Particle Soot Absorption Photometer