The Convective Cloud Population during the Buildup of the Madden-Julian Oscillation

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The Convective Cloud Population during the Buildup of the Madden-Julian Oscillation. R. Houze, S. Brodzik, J. Yuan University of Washington. AGU Fall Meeting, San Francisco, 7 December 2011. The Convective Cloud Population during the Buildup of the Madden-Julian Oscillation. - PowerPoint PPT Presentation

Text of The Convective Cloud Population during the Buildup of the Madden-Julian Oscillation

  • The Convective Cloud Population during the Buildup of the Madden-JulianOscillationAGU Fall Meeting, San Francisco, 7 December 2011R. Houze, S. Brodzik, J. Yuan University of Washington

  • The Convective Cloud Population during the Buildup of the Madden-JulianOscillationThree perspectives:A-TrainDYNAMOTRMM

  • The MJO

  • TRMM

  • Frequency of radar echo in broad stratiform regions of MCSs

  • Phase 7Phase 3Phase 1Phase 5Frequency of radar echo in deep convective cores

  • Phase 7Phase 3Phase 1Phase 5Frequency of shallow isolated radar echoes (anomaly)

  • Variation of Echo Category with MJO Phase

  • A-Train

  • Mesoscale Convective Systems (MCSs) have cold tops and large intense raining cores

    Both raining and anvil components are identified using A-Train instruments

  • Connected MCSsSeparated MCSsOther High Cloud SystemsNon-high-cloud Systems

  • DYNAMO

  • Cloud Structures(NCAR S-PolKa radar)

  • Suppressed phase:

    Lines of non-precipitating clouds

  • Suppressed phase:

    Clouds at cold pool boundaries

  • Suppressed phase:

    Clouds at cold pool boundaries

  • 4 km 8 km graupelsmall icelarge non-melting iceheavy rainSmall cumulonimbusmelting snow

  • Small, weak stratiform area

  • Active phase:

    Large mesoscale system StratiformConvective

  • Robust melting layer in Large MCS

  • Convection feeding into a large MCS

  • Shear

  • Low-level westerly component, upper-level easterly componentNENESWSW

  • Biggest MCS of first active phase: weak unidirectional shear

  • Larger-than-mesoscale Organization

  • Giant Rings of Convection

  • Westerly Surges

  • Extras

  • Categories of radar echoes seen by TRMM

  • MODIS TB11 + AMSR-E (Yuan and Houze 2010)combined to findcold centers & raining areas

  • 50 E 100 E 150 E 200 E DYNAMOMixing ratio anomaly10006002001000600200

  • Descent of easterlies

    *The midlevel inflow to the sf region is an imp part of the MCS circulation. *The midlevel inflow to the sf region is an imp part of the MCS circulation. Need to mention: MCS: large cold cloud top, large rain area, anvil, convective/stratiform rain MCSs previously studied in field projectsi.e. in local regions. Now they can be studied globally. Furthermore, the anvil clouds can be separated and studied separately.

    *1 mm/h eliminates light rain seen over ocean by AMSR-E. Cumulative PDFs of rain and rain area are similar for land and ocean if 1 mm/h is used. *