This work raises questions about the omission of Cunningham Slip Correction Factor (Cc(D)) in geometric equivalent diameter (Dp) conversions from the electric mobility diameter (Dm) and the aerodynamic diameter (Da) in relation to the calculation of effective density (ρe) as defined by Li et al. (2018; https://doi.org/10.1029/2018JD028956). They reported that ρe could be calculated using the formula “(Da/Dm)2,” in which Cc(D) was not introduced into the conversion between two diameters involving Dm a…
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