funded by nsf –grant ags 1059611. conceptual model of mesoscale convective systems (mcss)...
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The Hydrometeor Structure of Mesoscale Convective Systems
During DYNAMO
Hannah C. BarnesRobert A. Houze, Jr.
University of Washington
2013 Atmospheric System Research (ASR) Fall Working Group MeetingHilton Washington DC / Rockville Hotel & Executive Meeting Center
5 November 2013Funded by NSF –Grant AGS 1059611
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Conceptual Model of Mesoscale Convective Systems (MCSs)
Convective Stratiform
TOGA COARE: 3D, layer airflow
Kingsmill and Houze (1999a)
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IndianOcean
• Addu Atoll, Maldives• Dual wavelength
– Only using S-Band• Doppler • Dual-polarimetric
– Particle Identification Algorithm (Vivekanandan et al., 1999)
• RHI sectors
SPolKaDYNAMO-AMIE-CINDY
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Objective
Characterize hydrometeor structure of MCSs
• Composite with respect to kinematic structure
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Methodology• 11 rain maximums during
DYNAMO (Zuluaga and Houze, 2013)
• Subjectively identify cases • SPolKa radial velocity• Layer lifting• RHI sector and within 100 km• One per storm
• Manually map hydrometeor location using PID
• Composite around layer lifting
Zuluaga and Houze (2013)
Hourly Timeseries of Accumulated Rain
1 45 6
78 9
10 11
23
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Convective UpdraftdBZ Vrad
24 Oct 0250 UTC
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Wet Aggregates Dry Aggregates Small Ice Crystals Horz. Oriented Ice
Graupel / Rimed Aggregates Graupel - Rain
Heavy Rain Moderate Rain Light Rain Very Light Rain
Convective Updraft
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Conceptual Diagram of Convective Updrafts
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Distribution of Convective Polarimetric VariablesReflectivity
Correlation Coefficient Temperature
G GR HR MR LR VLR WA DA SI HI
G GR HR MR LR VLR WA DA SI HI
G GR HR MR LR VLR WA DA SI HI
G GR HR MR LR VLR WA DA SI HI
Differential Reflectivity
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Mid-Level InflowdBZ Vrad
23 Dec 1850 UTC
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Wet Aggregates Dry Aggregates Small Ice Crystals Horz. Oriented Ice
Graupel / Rimed Aggregates Graupel - Rain
Heavy Rain Moderate Rain Light Rain Very Light Rain
Leading Line – Trailing Stratiform
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Distribution of Squall Polarimetric VariablesReflectivity Differential Reflectivity
Correlation Coefficient Temperature
G GR HR MR LR VLR WA DA SI HI
G GR HR MR LR VLR WA DA SI HI
G GR HR MR LR VLR WA DA SI HI
G GR HR MR LR VLR WA DA SI HI
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Conceptual Diagram of Mid-Level Inflow
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Conclusions
• Comparison of model output and radar observations
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Mesoscale Modeling of Squall Line• WRF 3.4.1• Resolution: Outer – 9km, Inner – 3km• Cu Param: Outer – KF, Inner – None• MP Param: Both - Goddard• PBL Param: Both – UW• Forcing: ERAi• 00 UTC 23 Dec – 00 UTC 25 Dec
Reflectivity
Zonal Wind
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Distribution of Hydrometeor Mixing Ratio Zonal Wind and Reflectivity
Rain Mixing Ratio
Snow Mixing Ratio
Cloud Mixing Ratio
Graupel Mixing Ratio
Ice Mixing Ratio
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Model Representation of Anvils over Afirca
Powell et al., 2012
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Questions ?