Publication Date:
2020-10-26
Description:
The 2010 eruption of Eyjafjallajökull produced volcanic ash that was mostly deposited to the south and east of the volcano with the thickest deposits closest to the eruption vents. For months following the eruption there were numerous reports of resuspended volcanic ash made by weather observers on the ground. A saltation sensor (SENSIT) and an Optical Particle Counter (OPC) located on the southern side of Eyjafjallajökull measured post-eruptive particulate matter (PM) saltation and suspension events, some of which were also observable by satellite imagery. During the fall/winter following the eruption visible satellite images and the SENSIT show that PM measured by the OPC were only detected by the when winds had a northerly component, making the source on the slopes of Eyjafjallajökull. During the largest observed events, particles 〉10 μm were suspended but measured in extremely low concentrations (〈 1 particle/cm3). The saltation measurements, however, show high concentrations of particles 〉100 μm in size during these events. During the largest events, winds were at least 5 ms-1 with a relative humidity 〈 70%. Ground conditions in Iceland change quickly from unfavorable to favorable for the suspension of particles. It is hypothesized that this is due to the porosity of the surface material allowing water to filter through quickly, as well as the fast-drying time of surface material. The high moisture content of the atmosphere and the ground do not appear to be a deterrent for large PM events to occur in Iceland.
Electronic ISSN:
1087-3562
Topics:
Geography
,
Geosciences
,
Physics
