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C loud structure and organization under suppressed conditions during DYNAMO/AMIE/CINDY2011

C loud structure and organization under suppressed conditions during DYNAMO/AMIE/CINDY2011. Angela Rowe and Robert Houze , Jr. University of Washington 31 st Conference on Hurricanes and Tropical Meteorology San Diego, CA 1 April 2014. DYNAMO/AMIE/CINDY. Zuluaga and Houze (2013).

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C loud structure and organization under suppressed conditions during DYNAMO/AMIE/CINDY2011

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  1. Cloud structure and organization under suppressed conditions during DYNAMO/AMIE/CINDY2011 Angela Rowe and Robert Houze, Jr. University of Washington 31st Conference on Hurricanes and Tropical Meteorology San Diego, CA 1 April 2014

  2. DYNAMO/AMIE/CINDY Zuluaga and Houze (2013)

  3. S-PolKa Active periods: Increased rainfall/organization Suppressed periods: Reduced rainfall, shallower convection, dry mid-levels Objective: Describe the evolution of non-precipitating clouds to deeper convection during suppressed conditions

  4. October Rain Echo-top heights Number cells

  5. November Rain Rain Echo-top heights Echo-top heights Number cells Number cells

  6. Non-precipitating echo 0-5 dBZ No particular orientation Homogeneous collection of scatterers Cloud droplets

  7. Cloud lines (6 Nov) Z V

  8. Shallow convection 3 km Moderate rain

  9. Cell tracking (> 35 dBZ)

  10. 6 October Photo: Bob Houze

  11. 6 October 8 km

  12. 10 October 20-30 km diameters

  13. 12 km

  14. Lima and Wilson (2008) Amazon (TRMM-LBA)

  15. Summary • Convection forming along boundary layer features (rolls, cloud lines) in the morning • Non-precipitating clouds have distinct polarimetric signatures • Precipitating clouds produce cold pools late morning/afternoon • New initiation focused along gust front • More numerous and deeper convection when gust fronts collide • As near active period, increased rain, deeper echo, more cells, interacting cold pools

  16. Ongoing work • Characterize periods and properties of cloud lines (environment, frequency, diurnal cycle, non-precipitating clouds) • Manually document cold pools (maximum diameter, parent convection characteristics) • Search for times when gust front moves over Gan ARM site and relate to radar data

  17. Funded by NSF Grant #AGS-1059611 and DOE Grant #DE-SC0008452 Thank you!

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