the hydrometeor structure of mesoscale convective systems during dynamo hannah c. barnes
DESCRIPTION
The Hydrometeor Structure of Mesoscale Convective Systems During DYNAMO Hannah C. Barnes Robert A. Houze, Jr. University of Washington 2013 Atmospheric System Research (ASR) Fall Working Group Meeting Hilton Washington DC / Rockville Hotel & Executive Meeting Center 5 November 2013. - PowerPoint PPT PresentationTRANSCRIPT
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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 ?