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Daniel Fernandez, NASA/JPL Robert Contreras, UMass. High-res Lower Boundary Layer Observations of Hurricanes Rita and Ophelia with IWRAP. IWRAP: HS2005 summary. MEASUREMENTS : - PowerPoint PPT Presentation
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RAINEX Workshop Miami, FL
5-7 June, 2006
High-res Lower Boundary Layer Observations of Hurricanes
Rita and Ophelia with IWRAP
Daniel Fernandez, NASA/JPL
Robert Contreras, UMass
RAINEX Workshop5-7 June, 2006, RSMAS, Miami
IWRAP: HS2005 summary
MEASUREMENTS: C- and Ku-band reflectivity and Doppler velocity
profiles of precipitation and ocean backscatter for Hurricanes Ophelia (Sept. 7, 9, 11, 12 and 13) and Rita (Sept. 22 and 23).
PRODUCTS: Boundary Layer wind field below aircraft at 25 m
(vertical) x 0.5 km (horizontal) resolution.GOAL:
Process acquired datasets and extend current ABL retrievals down to the surface.
RAINEX Workshop5-7 June, 2006, RSMAS, Miami
1750
1500
1250
1000
750
500
250
0
55
50
45
40
35
30
25
20
17:36:55 UTC time 17:40:19
Alti
tude
(m
)
dBZ
Hurricane Rita, Sept. 22Ku-band
Reflectivity
RAINEX Workshop5-7 June, 2006, RSMAS, Miami
1750
1500
1250
1000
750
500
250
0
75
70
65
60
55
50
45
40m/s
Hurricane Rita, Sept. 22Ku-band
HorizontalWinds
Alti
tude
(m
)
RAINEX Workshop5-7 June, 2006, RSMAS, Miami
1750
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1250
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0
75
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65
60
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50
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40m/s
Alti
tude
(m
)Ku-band
HorizontalWinds
Hurricane Rita, Sept. 22
RAINEX Workshop5-7 June, 2006, RSMAS, Miami
1750
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0
75
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55
50
45
40m/s
Alti
tude
(m
)Ku-band
HorizontalWinds
Hurricane Rita, Sept. 22
RAINEX Workshop5-7 June, 2006, RSMAS, Miami
1750
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1250
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750
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0
75
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60
55
50
45
40m/s
Alti
tude
(m
)Ku-band
HorizontalWinds
Hurricane Rita, Sept. 22
RAINEX Workshop5-7 June, 2006, RSMAS, Miami
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1500
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1000
750
500
250
0
75
70
65
60
55
50
45
40m/s
Alti
tude
(m
)Ku-band
HorizontalWinds
Hurricane Rita, Sept. 22
RAINEX Workshop5-7 June, 2006, RSMAS, Miami
Volume Backscatter Profiles
Outer Side
Nadir Side
o
(N)
(N-1) (N)
(N-1)
Alti
tude
Distance from Aircraft Track
Antenna Pattern Main Lobe
Incidence Angle
Nadir SideOuterSide
Gai
n (d
Bi)
o
(N-1)
(N)
Range Gates (N & N-1)
Ocean Surface Backscatter Contamination
Outer Side
Nadir Side
o
Range Gate
(N)(N)
Range Gate
(N-1)
(N-1) (N)
(N-1)
Alti
tude
Distance from Aircraft Track
Antenna Pattern Main Lobe
Incidence Angle
Nadir SideOuterSide
Gai
n (d
Bi)
o
(N-1)
(N)
Range Gates (N & N-1)
RAINEX Workshop5-7 June, 2006, RSMAS, Miami
Ocean Surface Echo
Ocean SurfaceContamination
Volume Backscatter Profiles
Limitations in Wind Profiling of the lowest ABL
Rain Echo
RAINEX Workshop5-7 June, 2006, RSMAS, Miami
Doppler Spectral Profile
Ocean Return
Return from Precipitation
22 September 2005 – 19:55 GMT
1493
1217
942
667
391
116
-159Radial Doppler Velocity (m/s)
-110 -55 0 55 110
Alti
tude
(m
)
dB
-5
-10
-15
-20
-25
RAINEX Workshop5-7 June, 2006, RSMAS, Miami
Lower Atmospheric Boundary Layer
Ocean Return
Return from Precipitation / Winds
22 September 2005 – 19:55 GMT
380
250
120
-10
-140
Alti
tude
(m
)
Radial Doppler Velocity (m/s)
-110 -55 0 55 110
dB
20
15
10
5
Spectral Filtering Algorithm
22 September 2005 – 19:55 GMT
Precipitation Profile to Surface
Surface
Ocean Surface Backscatter
Original Measurements
RAINEX Workshop5-7 June, 2006, RSMAS, Miami
Volume Backscatter Profile
Spectral Filtering Applied
Near-surface rain echo
RAINEX Workshop5-7 June, 2006, RSMAS, Miami
Atmospheric Boundary Layer Profile
Alti
tude
(m
)
Wind Speed (m/s)
1000
100
RAINEX Workshop5-7 June, 2006, RSMAS, Miami
We are not part of the RAINEX effort ─yet.
Our goal for this workshop is to let you folks know what datasets we have and what products we can generate.
Our questions to you are:
How does high-res ABL winds down to the surface sound to you? other products?
In what ways fits /complement /supplement the overall RAINEX dataset and objectives?
Conclusions
