It was reported on Rúv News today about a new study that came out few days ago. In this study according to Rúv News the ash cloud from Eyjafjallajökull (2010) and Grímsfjall (2011) volcanoes where larger then appeared on satellite images. Meaning the ash could was covering larger area then appeared on images from space. The grain size in this eruptions was also underestimated. The decision to close down the airspace as was done in both eruptions was correct.
More details can be found here.
Viðbrögðin voru hárrétt (Rúv.is, Icelandic, audio in Icelandic)
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