Fig. 3
Mass closure between the 10-min averaged AMS and the SMPS (from which eBC is subtracted). The 10-min averaged time series for the mass concentration measured with the AMS and SMPS (- eBC) are shown in panels (a–c) for the three periods Oct-Dec, Mar-May and Jun-Jul, respectively. The corresponding density scatter plots with linear fit are shown in panels (d–f). The color bars indicate the probability density function of the distributions, calculated with a kernel density estimate (large values indicate close proximity and large density of data points). The low R2 between the AMS and SMPS (- eBC) mass for the Oct-Dec period (R2 = 0.016) is due to the forcing of the linear fit through the origin (R2 = 0.576 when shifting the slope to y = 0.154x + 0.0249, corresponding to the dashed red line in the figure in panel (d)).
