Figure 1

BC mass size distributions and mass absorption cross section (MAC).
The normalized BC mass size distributions from the atmosphere (remote and urban) and from the five snow samples, as a single average with whiskers representing the variation in the underlying distributions (standard deviation) are plotted against the left vertical axis. The MAC is plotted with a dashed line against the right vertical axis and was calculated for 460 nm light and BC with index of refraction (2.26, −1.26).