“The eruption was not continuous, but varied in degree” said Professor Jürgen Fischer, meteorologist at Freie Universität. “The air masses mix the aerosols to different degrees, so there are fluctuations.” The ash cloud was transported toward the east via western air currents.
The space scientists first took measurements from the tower of the Meteorological Institute of Freie Universität in Berlin-Dahlem. On April 20 and 21 they then flew their sampling airplane (a Cessna 207T) south and east of Berlin. Through the vertical ascent and descent, they were able to make statements about the distribution of aerosols in the air. The meteorologists and physicists have developed an instrument, a so-called sun photometer, for measuring the haze in the air. Scientists collect data on the size of the aerosols and their absorption and thus obtain information on the carbon black content in the air.