NDLI: Monitoring of the plume from the basaltic phreatomagmatic 2004 Grímsvötn eruption—application of weather radar and comparison with plume models

Content Provider	Springer Nature Link
Author	Oddsson, Björn Gudmundsson, Magnús T. Larsen, Guðrún Karlsdóttir, Sigrún
Copyright Year	2012
Abstract	The Grímsvötn eruption in November 2004 belongs to a class of small- to medium-sized phreatomagmatic eruptions which are common in Iceland. The eruption lasted 6 days, but the main phase, producing most of the 0.02 km3 of magma erupted, was visible for 33 h on the C-band weather radar of the Icelandic Meteorological Office located in Keflavík, 260 km to the west of the volcano. The plume rose to 8–12 km high over sea level during 33 h. The long distance between radar and source severely reduces the accuracy of the plume height determinations, causing 3.5-km steps in recorded heights. Moreover, an apparent height overestimate of ~1.5 km in the uncorrected radar records occurs, possibly caused by wave ducting or super-refraction in the atmosphere. The stepping and the height overestimate can be partly overcome by averaging the plume heights and by applying a height adjustment based on direct aircraft measurements. Adjusted weather radar data on plume height are used to estimate the total mass erupted using empirical plume models mostly based on magmatic eruptions and to compare it with detailed in situ measurements of the mass of erupted tephra. The errors arising because of the large radar plume distance limit the applicability of the data for detailed comparisons. However, the results indicate that the models overestimate the mass erupted by a factor of three to four. This supports theoretical models indicating that high steam content of phreatomagmatic (wet) plumes enhances their height compared to dry plumes.
Starting Page	1395
Ending Page	1407
Page Count	13
File Format	PDF
ISSN	02588900
Journal	Bulletin of Volcanology
Volume Number	74
Issue Number	6
e-ISSN	14320819
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-04-29
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Explosive eruptions Magma discharge Plume models Iceland Sedimentology Mineralogy Geophysics/Geodesy Geology
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology

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