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 amp Executive Meeting Center ID: 383937
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Slide1
The Hydrometeor Structure of
Mesoscale Convective Systems During DYNAMOHannah C. BarnesRobert A. Houze, Jr.University of Washington2013 Atmospheric System Research (ASR) Fall Working Group MeetingHilton Washington DC / Rockville Hotel & Executive Meeting Center 5 November 2013
Funded by NSF –Grant AGS 1059611Slide2
Conceptual Model of Mesoscale Convective Systems (MCSs)
ConvectiveStratiformTOGA COARE: 3D, layer airflowKingsmill and Houze (1999a)Slide3
Indian
Ocean
Addu Atoll, Maldives
Dual wavelength
Only using S-Band
Doppler
Dual-polarimetric
Particle Identification Algorithm (
Vivekanandan
et al., 1999)
RHI sectors
SPolKa
DYNAMO-AMIE
-
CINDYSlide4
Objective
Characterize hydrometeor structure of MCSsComposite with respect to kinematic structureSlide5
Methodology
11 rain maximums during DYNAMO (Zuluaga and Houze, 2013)Subjectively identify cases SPolKa radial velocityLayer liftingRHI sector and within 100 kmOne per stormManually map hydrometeor location using PIDComposite around layer liftingZuluaga and Houze (2013)
Hourly Timeseries of Accumulated Rain
1
4
5
6
7
8
9
10
11
2
3Slide6
Convective Updraft
dBZVrad24 Oct 0250 UTCSlide7
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 UpdraftSlide8
Conceptual Diagram of Convective UpdraftsSlide9
Distribution of Convective Polarimetric Variables
ReflectivityCorrelation CoefficientTemperature 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
Slide10
Mid-Level Inflow
dBZVrad23 Dec 1850 UTCSlide11
Wet Aggregates
Dry Aggregates Small Ice CrystalsHorz. Oriented IceGraupel / Rimed AggregatesGraupel - RainHeavy RainModerate RainLight RainVery Light Rain
Leading Line –
T
railing StratiformSlide12
Distribution of Squall Polarimetric Variables
ReflectivityDifferential ReflectivityCorrelation CoefficientTemperature 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
Slide13
Conceptual Diagram of Mid-Level InflowSlide14
Conclusions
Comparison of model output and radar observationsSlide15
Mesoscale Modeling of Squall Line
WRF 3.4.1Resolution: Outer – 9km, Inner – 3kmCu Param: Outer – KF, Inner – NoneMP Param: Both - GoddardPBL Param: Both – UWForcing: ERAi00 UTC 23 Dec – 00 UTC 25 Dec
Reflectivity
Zonal WindSlide16
Distribution of Hydrometeor Mixing Ratio
Zonal Wind and ReflectivityRain Mixing RatioSnow Mixing RatioCloud Mixing Ratio Graupel Mixing Ratio Ice Mixing RatioSlide17
Model Representation of Anvils over Afirca
Powell et al., 2012 Slide18
Questions ?