Fig. 4

Comparison of the particle size distributions from the APS, WIBS and USHAS (a) before correction and (b) after correction of the APS aerodynamic diameter. For (a) and (b), the thick lines represent the median dN/dlogDp at each size bins for the entire expedition, where polluted data were removed, and the shaded envelops represent the corresponding 25 and 75% quantiles. The comparison of the APS and WIBS total concentration after correction is shown in panel (c), where the reader can refer to the caption in Fig. 3 for a description of the color bar.