Convective scale variations in the inner core rainbands of tropical cyclones
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Convective-scale variations in the inner-core rainbands of tropical cyclones. Houze 2010. Anthony C. Didlake, Jr. and Robert A. Houze, Jr. 30 th Conference on Hurricanes and Tropical Meteorology April 17, 2012. Hurricane Rita. S t r a t i f o r m. NCAR ELDORA radar.

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Convective scale variations in the inner core rainbands of tropical cyclones
Convective-scale variations in the inner-core rainbands of tropical cyclones

Houze 2010

Anthony C. Didlake, Jr. and Robert A. Houze, Jr.

30th Conference on Hurricanes and Tropical Meteorology

April 17, 2012


Ncar eldora radar

Hurricane Rita tropical cyclones

S t r a t i f o r m

NCAR ELDORA radar

9/21/2005 1845-1927 Z

2 km reflectivity

dBZ

C o n v e c t i v e


Method of analysis
Method of analysis tropical cyclones

  • Divide into “inner” and “outer” regions

  • Classify pixels as “convective” or “stratiform”

  • Take radial cross sections across convective regions

Inner

Outer


Method of analysis1
Method of analysis tropical cyclones

  • Divide into “inner” and “outer” regions

  • Classify pixels as “convective” or “stratiform”

  • Take radial cross sections across convective regions

Inner

Outer


Composite cross sections
Composite cross sections tropical cyclones

Tangential wind (m/s) – Shaded contours

Reflectivity (dBZ) – Contour lines

Secondary circulation – Vectors

inner region outer region

v (m/s)

eye


Tangential wind

i tropical cyclonesnner region outer region

v (m/s)

Tangential wind

u (m/s)

Hence and Houze 2008

Radial wind


Tangential wind1

i tropical cyclonesnner region outer region

v (m/s)

Tangential wind

u (m/s)

Radial wind


Vertical velocity m s
Vertical velocity (m/s) tropical cyclones

CAPE as a function of radius

down

total

up

Bogner et al. 2000

solid – inner

dashed – outer


Tangential momentum tendency tropical cyclones

inner region outer region

blue – radial advection

red – vertical advection

green – Coriolis term

Altitude (km)

acceleration (m s-2)

acceleration (m s-2)


Tangential momentum tendency tropical cyclones

Total tendency

D red – inner black – outer

Altitude (km)

Altitude (km)

acceleration (m s-2)

acceleration (m s-2)


9/21/2005 2010 Z tropical cyclones

Rainband convective cells

Didlake and Houze 2012

9/22/2005 1800 Z

Secondary eyewall

Didlake and Houze 2011


Critical zone for secondary eyewall formation
Critical zone for secondary eyewall formation tropical cyclones

Rainband convective cells

  • Strong winds and low CAPE

  • Confinement of jet

  • Amplification via WISHE feedback

  • Inner edge subsidence

Didlake and Houze 2012

Secondary eyewall

Didlake and Houze 2011


Conclusions
Conclusions tropical cyclones

  • Kinematic structure varies with radius

  • Tangential jet depends on radial and vertical advection

    • Inner cell jets constrained to low levels

    • Outer cell jets occur within large range of altitudes

  • Convective cells can reach critical zone of secondary eyewall formation


Acknowledgments
Acknowledgments tropical cyclones

  • Michael Bell

  • Wen-Chau Lee

  • Stacy Brodzik

  • NDSEG Fellowship Program

  • NSF grant ATM-0743180


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