anvil generation in relation to cloud system water budget: twp-ice case of 19-20 january 2006
DESCRIPTION
Anvil Generation in Relation to Cloud System Water Budget: TWP-ICE Case of 19-20 January 2006. Jasmine Cetrone and Robert Houze University of Washington. 8 November 2006, ARM Cloud Processes Working Group, Annapolis, MD. Water Budget of an MCS. *. ICE ANVIL. *. ANVIL. CONV. STRATIFORM. - PowerPoint PPT PresentationTRANSCRIPT
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Anvil Generation in Relation to Cloud System Water Budget:
TWP-ICE Case of 19-20 January 2006
Jasmine Cetrone and Robert HouzeUniversity of Washington
8 November 2006, ARM Cloud Processes Working Group, Annapolis, MD
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Water Budget of an MCS
*
Ecd
Ccu
Csu
Esd
CT
Ac As
HEIGHT
MIXED ANVIL
Rc Rs
STRATIFORMCONV.ANVIL
Ece
XA
Ese
XSXC
ZA)I
XA)M XA)I
* *
* **** *
*ICE ANVIL
ZA)M
**
*
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Water Budget Equations
*
Ecd
Ccu
Csu
Esd
CT
Ac As
HEIGHT
MIXED ANVIL
Rc Rs
STRATIFORMCONV.ANVIL
Ece
XA
Ese
XSXC
ZA)I
XA)M XA)I
* *
* **** *
*ICE ANVIL
ZA)M
**
*
Ccu =Rc + Ecd + Ac +CT
Convective region water budget equationRc = εcCcu
Ecd= αCcu
Ac = βCcu
CT = ηCcu
εc+α+β+η=1
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Water Budget Equations
*
Ecd
Ccu
Csu
Esd
CT
Ac As
HEIGHT
MIXED ANVIL
Rc Rs
STRATIFORMCONV.ANVIL
Ece
XA
Ese
XSXC
ZA)I
XA)M XA)I
* *
* **** *
*ICE ANVIL
ZA)M
**
*
Csu +CT =Rs + Esd + As
Stratiform water budget equation
Rain not simply related to condensation
Rs = εs(Csu+CT)Esd= a(Csu+CT)As = b(Csu+CT)
εs+a+b=1
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*
Ecd
Ccu
Csu
Esd
CT
Ac As
HEIGHT
MIXED ANVIL
Rc Rs
STRATIFORMCONV.ANVIL
Ece
XA
Ese
XSXC
ZA)I
XA)M XA)I
* *
* **** *
*ICE ANVIL
ZA)M
**
*
PRECIPITATING CLOUD
ANVIL
Rc Rs
Ac + As* ** **
**
*
*
*ZA
** *
XAXSXC
XA)M XA)I
HEIGHT
Simplified Water Budget Model
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19-20 January MCS
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19-20 January MCS
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19-20 January MCS
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19-20 January MCS
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19-20 January MCS
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19-20 January MCS
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19-20 January MCS
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19-20 January MCS
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19-20 January MCS
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19-20 January MCS
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19-20 January MCS
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19-20 January MCS
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19-20 January MCS
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19-20 January MCS
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19-20 January MCS
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19-20 January MCS
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19-20 January MCS
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19-20 January MCS
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Finding anvil amounts from water budget equations
• Assume portion of cloud system passing over radar was representative of whole system (not true)
• Compute total convective and stratiform rain amounts from C-Pol radar (in radar domain)
• Use a range of assumed values of the water budget parameters εc,α,η,εs,a (from Houze and Cheng 1981)
• Compute Ac + As
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Results using water budget
Rc=2.8586 x 1012 kg, Rs=6.7226 x 1011 kg
α a εc Ac + As
0.13 0.35 0.38 1.0538 x 1012 kg
0.13 0.20 0.49 6.9538 x 1011 kg
0.13 0.15 0.50 6.6096 x 1011 kg
0.13 0.08 0.54 5.6997 x 1011 kg
0.13 0 0.50 6.2993 x 1011 kg
0.13 0 0.61 4.4759 x 1011 kg
Realistic Values, acc. to Houze and Cheng 1981
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19-20 January MCS
dBZ
Convective Stratiform Anvil
Cloud Radar
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Finding anvil amounts from MMCR and C-Pol
• Find a relationship between cloud thickness and IWP (MMCR)
• Compute the average area and thickness of anvil clouds in radar range using C-Pol
• Calculate the amount of anvil water/ice (Ac + As) that is in range of C-Pol
IWP=0.026∆z3.0434
R2=0.9101
IWP [kg/m2]
Thic
knes
s [k
m]
Ac + As = 4.2730 x 1010 kg
We’re only getting about 10% of the anvil calculated by the water
budget equations
MMCR
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Why such a difference??
1. The CPol will miss some anvil because of it’s lower sensitivity
4
0
8
12
16
20
00 1206
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Why such a difference??
2. Above about 8-km, the winds were easterly, shearing much of the anvil to the west instead of it trailing behind the system (i.e. out of CPol’s range)
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Future Improvements
• Use dual-Doppler velocities, cloud radar, and sounding data to compute other values (CT, Ccu, Ecd, Csu, Esd) to calculate the water budget parameters
• Use satellite data to extend water budget to the whole system, rather than just radar area
• Use model simulations to help close the water budget
• Connect water budget to the TRMM PR overpass
• Find other casesJASMINE, KWAJEX
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JASMINE Ship RadarData
TRMM PrecipitationRadar Swath
23 May 1999 0650 LST
JASMINE
Bay of Bengal
India
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Cloud Radar
Cloud radar on ship shows anvil
Cloud RadarTRMM PR
TRMM PR
Also: Scanning radar and ship soundings
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KWAJEX•TRMMTRMM
•Scanning C- and S-band Doppler radarsScanning C- and S-band Doppler radars•Vertically Pointing S-band radarVertically Pointing S-band radar
•Sounding NetSounding Net
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Thanks!
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KWAJEX
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