Tags: Ashfall Graduate Class

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  5. 1992 Spurr Eruption Case Discussion

    27 Apr 2011 | Contributor(s):: William I Rose

    This lecture summarizes distal ash cloud observations via satellite and radar, along with information about meteorology and fallout, for the 1992 Crater Peak/Spurr eruptions. These small subplinian events produced significant fine and very fine ash fallouts that were sampled and measured. Even...

  6. Thunderstorms and Volcanic Clouds

    27 Apr 2011 | Contributor(s):: William I Rose

    There are many similarities between eruption clouds and common convective clouds which lead to thunderstorms. This lecture calls attention to the comparison.

  7. Reducing the threat to aviation from airborne volcanic ash

    10 Feb 2011 | Contributor(s):: William I Rose

  8. Chaiten eruption observations, May 2008

    10 Feb 2011 | Contributor(s):: William I Rose

    A review of the Chaiten eruptions based mainly on satellite observations. This lecture was compiled in October 2009.

  9. Detecting volcanic ash from space

    08 Feb 2011 | Contributor(s):: William I Rose

    How satellites detect, map and measure volcanic ash in volcanic clouds. HYSPLIT and volcanic cloud satellite observations. Volcanic cloud stages. Infrared satellite detectors, split window. Evolution of volcanic clouds from space platforms.Rose, W I, G J S Bluth, D J Schneider, G G J Ernst, C M...

  10. Direct sampling of volcanic clouds

    08 Feb 2011 | Contributor(s):: William I Rose

    Volcanic clouds have only sporadically been directly sampled. Sampling is advantageous to validate remote sensing. Direct sampling was more common in the 1978-1984 period before the hazards to jet aircraft were understood and when piston aircraft sampling was more prevalent. This sampling...

  11. Volcanological meteorology

    08 Feb 2011 | | Contributor(s):: William I Rose

    Atmospheric layers, pressure temperature relationships. Origin of winds. Wind shear and pressure maps. Weather satellite data, weather radar systems. Cloud classifications. Radiosondes. Latent heat and Bowen ratios. Phase changes of water.

  12. Ashfall blankets

    08 Feb 2011 | | Contributor(s):: William I Rose

    Ashfall deposit geometry--blanket. Grain size/distance patterns. Total grain size distributions.Rose, W I, S Self, P J Murrow, G G J Ernst C Bonadonna and A J Durant, 2007, Pyroclastic fall deposit from the October 14, 1974 eruption of Fuego Volcano, Guatemala, Bull Volcanol,70 (9): 1043-1067,...

  13. Numerical fallout models: An introduction based on Suzuki (1983)

    08 Feb 2011 | | Contributor(s):: William I Rose

    Suzuki, T., 1983. A theoretical model for dispersion of tephra, in: D. Shimozuru and I. Yokoyama (eds) Arc Volcanism: Physics and Tectonics, Terra Scientific Publishing, Tokyo, 95-116.

  14. Particle fall through the atmosphere

    08 Feb 2011 | | Contributor(s):: William I Rose

    Particle fall in atmosphere. Particle Reynolds Numbers, turbulent and laminar flow. Shapes of volcanic ash particles. Fine particle fallout. Aggregation.Rose W I, C M Riley and S Dartevelle, 2003, Sizes and shapes of 10 ma distal ashfall pyroclasts in the Ogalalla Group, Nebraska, J Geology,...

  15. Eruption columns

    08 Feb 2011 | | Contributor(s):: William I Rose

    Discussion of gas thrust, convective thrust and eruption columns. Column height and eruption rate. Convection in the atmosphere, latent heat. Stages of evolution of eruption plumes to volcanic clouds.

  16. Phreatic and phreatomagmatic fragmentation

    08 Feb 2011 | | Contributor(s):: William I Rose

  17. Origin of volcanic ash: Mechanisms for formation

    08 Feb 2011 | | Contributor(s):: William I Rose

    Mechanisms for the formation of volcanic ash are reviewed and discussed, including explosive vesiculation, phreatomagmatic explosions and milling/comminution.