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| Titel |
Grímsvötn 2011 tephra in the UK: public sampling, air quality and comparison with model predictions. |
| VerfasserIn |
J. A. Stevenson, S. C. Louglin, C. Rae, C. Witham, M. Hort, T. Thordarson  , A. MacLeod |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250065138
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| Zusammenfassung |
| The May 2011 eruption of Grímsvötn, Iceland, was short-lived but powerful. Tephra was
transported to the UK, where it could be identified in rainwater, sticky-tape samples and air
quality data. We present analysis of timings and extent of tephra transport and compare them
to predictions from the NAME dispersion model.
Daily rainwater samples collected during the eruption were analysed. Tephra grains
were identified in a number of samples and the most common diameter was 20–40
μm.
A nationwide public sampling effort, coordinated by the British Geological
Survey, returned over 100 sticky-tape samples. Confident identification of tephra is
only possible where mass loadings are high. Samples were labelled with start time,
end time and location, which allowed both the timing and location of deposition
to be resolved. The results show that most deposition took place during rainfall,
48–70 hours after the onset of eruption, and was restricted to Scotland and further
north.
Air quality monitoring data show an increase in surface PM10 concentration as the plume
passed over the UK. The highest hourly concentration, ~ 250Â μgm-3, was measured
in Aberdeen on 24 May 2011. Smaller peaks are found at other locations further
south.
Predictions by the NAME dispersion model show good agreement with the timing and
extent of tephra distribution, however validation of concentration/mass-loading estimates is
currently much more difficult. |
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