SO4 Aitken scavenged by convective precipitation kg(S)/m2/tstep 1418 SO4 Aitken scavenged by convective precipitation kg(S)/m2/tstep SO4 Aitken scavenged by convective precipitation kg(S)/m2/tstep SO4 Aitken scavenged by convective precipitation kg(S)/m2/tstep