This implies that, relative to VOL-CALPUFF, more distal locations will be affected by smaller deposits, but that the probability of reaching higher tephra loads in more proximal areas will be lower, as shown in Figs. 8 and 9.
However, these previous studies did not consider the photovoltaic sector in detail, despite the high exposure to tephra fall.
The high variability in tephra thickness shown in the Western Finisterres and the Kodiak sites has implications for how many samples are necessary to confidently determine mean tephra thickness at sites with thin tephra (i.e. less than 200 mm).
There were substantial concerns from residents and business owners that if the eruption was to continue producing high volumes of tephra, the ability to manage, clean and recover would be exceeded.
A 6 7 km high, two-tiered tephra-laden plume typified the activity on 17 April, causing total darkness for 20 hours in the Eyjafjöll district south the volcano.
As a consequence, these disposal sites must accept much higher volumes of tephra than the others.
Plinian eruptions, with typical duration of hours, are characterized by magma discharge of 107 108 kg s−1 supporting 20 45 km high plumes often producing tephra falls covering ≥106 km2 (ref. 1 2).
For example, the peak in Aberdeen on 24 May is measured in a number of surrounding stations and is likely to be tephra, but the high value in Perth High Street on 26 May is not.
However, most of the tephra reached higher levels of the atmosphere, and was transported by the wind hundreds of miles.
Major element concentrations of the volcanic particles show high similarity with those of tephra layers associated with the South Sandwich Islands in the EPICA-Dome C, Vostok, and Dome Fuji ice cores.
