Dp2 f urn

Figure 1 Residence times of tropospheric aerosols as a function of" particle radius Dp/2. I, small atmospheric ions; A, so-called Aitken particles, radii 0,001 to 0.1 jim, residence time estimated from geographical distributions; C, residence time calculated based on Brownian coagulation of particles; R. radioactivity; R precipitation removal; F, sedimentation. The three curves shown correspond to the three altitude levels indicated based on F.q. (5). Adapted from Jaenicke (I98S).

1983). Typical sea salt aerosol concentrations in the marine boundary layer (MBL) are thought to be around 20 to 30/cm3 (Blanchard and Cipriano, 1987; O'Dowd and Smith, 1993).

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