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The volcanic dust was measured using newly-developed probes that attach to meteorological balloons that can be used for measuring volcanic dust.
The Met Office Chief Forecaster, in conjunction with atmospheric dispersion scientists, used our plume forecast to identify a suitable location for the launch.
The RAF helicopter scrambled at the weekend to transport the scientists and equipment to fly to Scotland at low level under the ash plume had to be grounded, forcing a long journey through the night by road for scientists from Reading University, the Met Office in Exeter and Lincolnshire.
The weather balloon and probe was launched at 9 a.m. on Monday morning and clearly showed a 600 metre-thick layer of dust at a height of 4 km.
The layer was found to contain highly abrasive dust particles, at concentrations of a third of a milligram of dust in each cubic metre. While the amount sounds small, a typical jet engine would ingest some 60 billion of these particles every second.
And airlines are telling us it is completely safe to fly. But can you really blame them when they are losing millions each day?
EDIT: Actually, looking at the latest charts, also courtesy of Met, things appear to be getting better for Europe. Sorry for such a large image.
*hopes it stops before getting to the United States*
Edited by Alex - MetroAir, 20 April 2010 - 11:48 PM.