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Volcanic ash and aerosol detection versus dust detection using GOES and MODIS imagery

Volcanic ash and aerosol detection versus dust detection using GOES and MODIS imagery. Bernadette Connell Cooperative Institute for Research in the Atmosphere Colorado State University 2nd International Conference on Volcanic Ash and Aviation Safety June 21-24, 2004 Alexandria, Virginia, USA.

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Volcanic ash and aerosol detection versus dust detection using GOES and MODIS imagery

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  1. Volcanic ash and aerosol detection versus dust detection using GOES and MODIS imagery Bernadette Connell Cooperative Institute for Research in the Atmosphere Colorado State University 2nd International Conference on Volcanic Ash and Aviation SafetyJune 21-24, 2004Alexandria, Virginia, USA

  2. Main Features • “Easy” to implement techniques: • BT11.0um-BT12.0um • BT11.0um-BT3.9um (night) • Estimated “reflected” 3.9um (day) • False color 3.9/11.0/12.0um product • BT8.5um-BT12.0um (ash and/or aerosol) • Examples of volcanic constituents vs. dust with GOES and MODIS data

  3. Ash/Dust in the 3.9 – 11.0 um range • DAY: higher reflectance for ash/dust clouds and water droplets; lower reflectance for ice particles • NIGHT: BT11.0-BT3.9 = negative for thin ash/dust clouds = negative for ice cloud = positive for water cloud Volcanic Aerosol vs. Ash/Dust in the 8.5 – 12.0 um range • BT8.3um – BT12.0um = negative for SO2 and H2SO4 • BT8.3um – BT12.0um = negative for silicates, but sensitive to particle size. Ash/Dust in the 11.0 – 12.0 um range • BT11.0um-BT12.0um = negative for ash/dust = positive for ice/water cloud

  4. Visible 3.9 um 10.7 um Popocatepetl Volcano, Mexico 22 January, 2001 22:45 UTC GOES-8 imagery

  5. Popocatepetl Volcano, Mexico 22 January, 2001 22:45 UTC GOES-8 imagery

  6. GOES imagery and products 23 January 2001 04:45 UTC 10.7 um BT10.7-BT3.9 Popocatepetl, Mexico BT10.7-BT12.0 False color: 10.9/BT10.7-BT12.0/BT10.7-BT3.9

  7. 22 January, 2001 04:45 UTC GOES, 04:50 UTC MODIS Popocatepetl, Mexico GOES-8 BT10.7-BT12.0 MODIS Terra BT11.0-BT12.0 MODIS Terra BT8.5-BT12.0

  8. DUST detection with GOES imagery 10.7 um visible 18 April, 2001 19:30 UTC BT10.7-BT12.0 Reflectance

  9. DUST detection GOES-8 BT10.7-BT12.0 MODIS Aqua true color 18 April, 2001 19:30 UTC MODIS Aqua BT11.0-BT12.0 MODIS Aqua BT8.5-BT12.0

  10. Summary remarks and points to ponder • Variability of eruption cloud: If multi-channel imagery is available, use it! • What is the significance of large (or small) BT10.7-BT12.0? • What are we seeing using the 8.x um region (ash/dust/aerosol)? • How can we best combine this information with other information on SO2 detection?

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