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. 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 Funded by NSF –Grant AGS 1059611

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Page 1: Funded by NSF –Grant AGS 1059611. Conceptual Model of Mesoscale Convective Systems (MCSs) ConvectiveStratiform TOGA COARE: 3D, layer airflow Kingsmill

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

Page 2: Funded by NSF –Grant AGS 1059611. Conceptual Model of Mesoscale Convective Systems (MCSs) ConvectiveStratiform TOGA COARE: 3D, layer airflow Kingsmill

Conceptual Model of Mesoscale Convective Systems (MCSs)

Convective Stratiform

TOGA COARE: 3D, layer airflow

Kingsmill and Houze (1999a)

Page 3: Funded by NSF –Grant AGS 1059611. Conceptual Model of Mesoscale Convective Systems (MCSs) ConvectiveStratiform TOGA COARE: 3D, layer airflow Kingsmill

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

Page 4: Funded by NSF –Grant AGS 1059611. Conceptual Model of Mesoscale Convective Systems (MCSs) ConvectiveStratiform TOGA COARE: 3D, layer airflow Kingsmill

Objective

Characterize hydrometeor structure of MCSs

• Composite with respect to kinematic structure

Page 5: Funded by NSF –Grant AGS 1059611. Conceptual Model of Mesoscale Convective Systems (MCSs) ConvectiveStratiform TOGA COARE: 3D, layer airflow Kingsmill

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

Page 6: Funded by NSF –Grant AGS 1059611. Conceptual Model of Mesoscale Convective Systems (MCSs) ConvectiveStratiform TOGA COARE: 3D, layer airflow Kingsmill

Convective UpdraftdBZ Vrad

24 Oct 0250 UTC

Page 7: Funded by NSF –Grant AGS 1059611. Conceptual Model of Mesoscale Convective Systems (MCSs) ConvectiveStratiform TOGA COARE: 3D, layer airflow Kingsmill

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

Page 8: Funded by NSF –Grant AGS 1059611. Conceptual Model of Mesoscale Convective Systems (MCSs) ConvectiveStratiform TOGA COARE: 3D, layer airflow Kingsmill

Conceptual Diagram of Convective Updrafts

Page 9: Funded by NSF –Grant AGS 1059611. Conceptual Model of Mesoscale Convective Systems (MCSs) ConvectiveStratiform TOGA COARE: 3D, layer airflow Kingsmill

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

Page 10: Funded by NSF –Grant AGS 1059611. Conceptual Model of Mesoscale Convective Systems (MCSs) ConvectiveStratiform TOGA COARE: 3D, layer airflow Kingsmill

Mid-Level InflowdBZ Vrad

23 Dec 1850 UTC

Page 11: Funded by NSF –Grant AGS 1059611. Conceptual Model of Mesoscale Convective Systems (MCSs) ConvectiveStratiform TOGA COARE: 3D, layer airflow Kingsmill

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

Page 12: Funded by NSF –Grant AGS 1059611. Conceptual Model of Mesoscale Convective Systems (MCSs) ConvectiveStratiform TOGA COARE: 3D, layer airflow Kingsmill

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

Page 13: Funded by NSF –Grant AGS 1059611. Conceptual Model of Mesoscale Convective Systems (MCSs) ConvectiveStratiform TOGA COARE: 3D, layer airflow Kingsmill

Conceptual Diagram of Mid-Level Inflow

Page 14: Funded by NSF –Grant AGS 1059611. Conceptual Model of Mesoscale Convective Systems (MCSs) ConvectiveStratiform TOGA COARE: 3D, layer airflow Kingsmill

Conclusions

• Comparison of model output and radar observations

Page 15: Funded by NSF –Grant AGS 1059611. Conceptual Model of Mesoscale Convective Systems (MCSs) ConvectiveStratiform TOGA COARE: 3D, layer airflow Kingsmill

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

Page 16: Funded by NSF –Grant AGS 1059611. Conceptual Model of Mesoscale Convective Systems (MCSs) ConvectiveStratiform TOGA COARE: 3D, layer airflow Kingsmill

Distribution of Hydrometeor Mixing Ratio Zonal Wind and Reflectivity

Rain Mixing Ratio

Snow Mixing Ratio

Cloud Mixing Ratio

Graupel Mixing Ratio

Ice Mixing Ratio

Page 17: Funded by NSF –Grant AGS 1059611. Conceptual Model of Mesoscale Convective Systems (MCSs) ConvectiveStratiform TOGA COARE: 3D, layer airflow Kingsmill

Model Representation of Anvils over Afirca

Powell et al., 2012

Page 18: Funded by NSF –Grant AGS 1059611. Conceptual Model of Mesoscale Convective Systems (MCSs) ConvectiveStratiform TOGA COARE: 3D, layer airflow Kingsmill

Questions ?