Articles | Volume 8, issue 5
https://doi.org/10.5194/amt-8-2069-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/amt-8-2069-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Big grains go far: understanding the discrepancy between tephrochronology and satellite infrared measurements of volcanic ash
J. A. Stevenson
CORRESPONDING AUTHOR
School of GeoSciences, University of Edinburgh, Edinburgh, UK
S. C. Millington
Met Office, Exeter, UK
F. M. Beckett
Met Office, Exeter, UK
G. T. Swindles
School of Geography, University of Leeds, Leeds, UK
T. Thordarson
Institute of Earth Sciences, Háskóli Íslands, Reykjavík, Iceland
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- Do peatlands or lakes provide the most comprehensive distal tephra records? E. Watson et al. 10.1016/j.quascirev.2016.03.011
- New Zealand supereruption provides time marker for the Last Glacial Maximum in Antarctica N. Dunbar et al. 10.1038/s41598-017-11758-0
- Cryptotephras: the revolution in correlation and precision dating S. DAVIES 10.1002/jqs.2766
- Far‐travelled ash in past and future eruptions: combining tephrochronology with volcanic studies K. Cashman & A. Rust 10.1002/jqs.3159
- Optimising shape analysis to quantify volcanic ash morphology E. Liu et al. 10.1016/j.grj.2015.09.001
- Volcanic ash concentration during the 12 August 2011 Etna eruption S. Scollo et al. 10.1002/2015GL063027
- Impact of the lateral blast on the spatial pattern and grain size characteristics of the 18 May 1980 Mount St. Helens fallout deposit J. Eychenne et al. 10.1002/2015JB012116
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Latest update: 13 Dec 2024
Short summary
We attempt to understand why volcanic ash grains found 100s of km from their source volcanoes (cryptotephra), which are typically 20–125 microns in length, are much larger than the size distributions measured by satellite remote sensing, which are centred at less than 10 microns. Our observations and models show that cryptotephra-sized grains are to be expected in distal plumes. Retrievals of effective radius made on simulated satellite images are shown to be biased toward smaller values.
We attempt to understand why volcanic ash grains found 100s of km from their source volcanoes...