Cloud structure and organization under suppressed conditions during DYNAMO/AMIE/CINDY2011 Angela Rowe and Robert Houze, Jr. University of Washington 31.

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Presentation transcript:

Cloud 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)

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

October Rain Echo-top heights Number cells

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

Non-precipitating echo 0-5 dBZNo particular orientation Homogeneous collection of scatterers Cloud droplets

Cloud lines (6 Nov) ZV

Shallow convection 3 km Moderate rain

Cell tracking (> 35 dBZ)

Photo: Bob Houze 6 October

8 km

20-30 km diameters 10 October

12 km

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

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 Summary

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 Ongoing work

Funded by NSF Grant #AGS and DOE Grant #DE-SC Thank you!