Rain cloud? (IMAGE)

Max-Planck-Gesellschaft

Rain cloud?

Caption

Not every dense cloud brings rain. Rain falls in a normal way in unpolluted air from this cloud over the Amazon (left). In contrast, no rain fell from another cloud on the same day due to the cloud being encumbered with a high number of aerosols caused by fire clearance -- the moisture droplets remained too small (right).

Credit

Left: Meinrat Andreae, MPI for Chemistry; right: Daniel Rosenfeld, Hebrew University, Jerusalem

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