LAUSR

Abstract We estimate the multiple scattering correction factor (), which is an empirical constant required to correct aerosol absorption coefficient () measurements for the multiple scattering artifacts of aethalometer, using a multiplier derived from a linear regression method (). Estimated values during the Cheju ABC Plume Monsoon EXperiment (CAPMEX) are 3.99 (405 nm), 4.48 (532 nm), and 5.46 (781 nm) using aethalometer and 3-wavelength PhotoAcoustic Soot Spectrometer (PASS-3). The difference between these values and those of a previous study () are ˗8.0% (405 nm), 20.1% (532 nm), and 30.2% (781 nm); the difference is greater at larger wavelengths because the linear regression line intercept is larger. varies by up to 121% with increasing aerosol absorption coefficient () at 532 and 781 nm, whereas varies by only 36.8%. and determined during CAPMEX were applied to year-round aethalometer measurements ( and , respectively) at Gosan (GSN), Lulin (LLN), and Alert (ALT) stations. and were compared to concurrent measurements from Continuous Light Absorption Photometer (CLAP; ). At GSN, the bias difference and root mean square difference of from are ˗23.1 and 25.8%; however, those of from are ˗9.0 and 17.9%, respectively. LLN and ALT both exhibit a greater difference between and than between and . This suggests that can be applied to year-round aethalometer measurements. Furthermore, agrees better with than in all three environments. Copyright © 2019 American Association for Aerosol Research