This value-added product (VAP) corrects aerosol chemical speciation monitor (ACSM) data for non-unity particle detection. The VAP is based on a procedure described in Middlebrook et al. (2012). The procedure applies the Middlebrook composition-dependent collection efficiency (CDCE) correction to the ACSM data to improve their accuracy, and it brings the data into better agreement with other co-located aerosol measurements. The same VAP algorithm is applied to ARM’s time-of-flight (ToF) and quadrupole-ACSM instruments.
Reference: Middlebrook AM, R Bahreini, JL Jimenez, and MR Canagaratna. 2012. “Evaluation of Composition-Dependent Collection Efficiencies for the Aerodyne Aerosol Mass Spectrometer using Field Data.” Aerosol Science and Technology, 46(3): 258-271, https://doi.org/10.1080/02786826.2011.620041.