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The Interaction of African Dust and Dry-air Outbreaks

The Interaction of African Dust and Dry-air Outbreaks. Xiaoyu Liu Univ. of Miami/RSMAS. Outline. Motivation Data and methodology Preliminary results Conclusion and future work. Motivation.

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The Interaction of African Dust and Dry-air Outbreaks

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  1. The Interaction of African Dust and Dry-air Outbreaks Xiaoyu Liu Univ. of Miami/RSMAS

  2. Outline • Motivation • Data and methodology • Preliminary results • Conclusion and future work

  3. Motivation • Aerosol and water vapor affect clouds and convection (e.g., in tropical cyclones and African monsoon) differently. • Are African dust outbreaks always dry? Are African dry-air outbreaks always dusty? • Can we study their relationship using satellite data?

  4. Aerosol: TOMS Earth Probe satellite data 1996-present 1˚ x 1.25˚ Water Vapor: NVAP(NASA Water Vapor Project) data 1988-1997 1˚ x 1˚ dataset Jan - Dec 1997 1˚ x 1˚

  5. Aerosol: Aerosol Index Column integrated Water Vapor: Integrated precipitable water L1 surface-700mb L2 700-500mb L3 500-300mb Methodology

  6. Seasonal mean Aerosol Winter PW Winter Aerosol Spring PW Spring

  7. Seasonal mean Aerosol Summer PW Summer Aerosol Fall PW Fall

  8. Seasonal Variance Aerosol Winter PW Winter PW Spring Aerosol Spring

  9. Seasonal Variance Aerosol Summer PW Summer Aerosol Fall PW Fall

  10. Synoptic-Scale Correlation Winter Summer Fall Spring

  11. Time-series Winter Spring

  12. Synoptic-Scale Correlation Winter Summer Fall Spring

  13. Time-series Winter Spring

  14. Time-series Summer Fall

  15. Conclusion • The character of African air is not simple. Dust and water vapor are related in certain ways, but can be independent of each other. • Data of a longer record are needed to quantify their relationships.

  16. Vertical Structure Inter-annual variability New satellite data (MODIS, AQUA) Acknowledgment: Chidong Zhang, Jeremy Pennington, J. Lin Future Work

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