huailin chen, bruce gentry, tulu bacha, belay demoz, demetrius venable destin, fl
DESCRIPTION
Goddard Lidar Observatory for Winds (GLOW) Wind Profiling from the Howard University Beltsville Research Facility. Huailin Chen, Bruce Gentry, Tulu Bacha, Belay Demoz, Demetrius Venable Destin, FL February , 2010. - PowerPoint PPT PresentationTRANSCRIPT
G O D D A R D S P A C E F L I G H T C E N T E R
Goddard Lidar Observatory for Winds (GLOW) Wind Profiling
from the Howard University Beltsville
Research Facility Huailin Chen, Bruce Gentry, Tulu Bacha, Belay Demoz, Demetrius
Venable
Destin, FLFebruary , 2010
G O D D A R D S P A C E F L I G H T C E N T E R
NASA Wind Lidar Science (WLS) Experiment at Howard Beltsville
Research FacilityGOALS
• Develop understanding of direct detection (GLOW) wind speed and direction performance for various cloud and aerosol loading conditions (pollution, cirrus), using the 355nm backscatter ratios and water vapor data independently measured by the Raman lidar as well as synergistic measurements from the Beltsville instrument suite.
• Develop a seasonal data base archive for wind measurements.
• Intercomparison of coherent and direct detection Doppler lidars
• Compare Doppler lidar wind data to other sensors (Profiler, Radiosonde, ACARS).
Funded by NASA SED, ROSES07-WLS (Dr. Ramesh Kakar)
G O D D A R D S P A C E F L I G H T C E N T E R
Overview for GLOW
Measurement summary •Vertical resolution=250 m t=3 min •Altitude range= 2 to 15 km•Elevation angle= 45 deg•Scan pattern = 4 directions: (N,S,E,W)+vertical•Dwell per LOS = 30 sec
Goddard Lidar Observatory for Winds (GLOW) mobile Doppler lidar
• Direct detection Doppler Lidar system• Measures clear air wind profiles using molecular backscatter• Serves as testbed for air and space based lidar technologies• Multiple field campaigns since 2000
Line of sight wind profiles are sequentially measured at 4 azimuth angles (N,S,E,W)+vertical. The multiple direction LOS profiles are combined to produce vertical profiles of horizontal wind speed and direction (right)
G O D D A R D S P A C E F L I G H T C E N T E R
GLOW at Beltsville Research Site
G O D D A R D S P A C E F L I G H T C E N T E R
Upgrades for GLOW
• Laser ( 50Hz, 25mJ/pulse, Diode pumped )
• Reference Signal Measurement
• Electronics ( Preamps, discriminators, boxcar integrators)
• Etalon Calibration
G O D D A R D S P A C E F L I G H T C E N T E R
Laser
• Diode Pumped, 50Hz, 20mJ/pulse• More Stable seed laser• Less energy consumption improves the
temperature stability inside GLOW
G O D D A R D S P A C E F L I G H T C E N T E R
Reference Measurement
Laser Reference Signal Sampling Optics
FiberCollimator
FiberCollimator
Reference Signal Fiber
From Telescope
Lidar Signal Fiber
M1
BS R=95%, T=5%
To Receiver
Lidar Signal+ Reference Signal
FiberCollimator
IF
G O D D A R D S P A C E F L I G H T C E N T E R
Etalon Calibration Scan
-0.2
0
0.2
0.4
0.6
0.8
1
-8 -6 -4 -2 0 2 4 6
Etalon0903301344
aLockaEdge1aEdge2
Ener
gy N
orm
aliz
ed E
talo
n Li
nesh
ape
Func
tion
Frequency (GHz)
G O D D A R D S P A C E F L I G H T C E N T E R
Wind Measurements in 2009
• From Feb. 21 to Oct. 20, 50days, 310 hours
• Variety weather conditions: different aerosol loadings, cirrus clouds at different altitude, front passage.
• GLOW-Validar Intercomparison: Feb 21-Mar 10. GLOW/Validar/AT/ALVICE HURL/Sonde/915 MHz profiler
• Mar. 2009 Campaign: Mar. 20-31 . GLOW/AT/ALVICE HURL/Sonde/915 MHz profiler
• Regular GLOW/Sonde comparisons
G O D D A R D S P A C E F L I G H T C E N T E R
Measurement Errors
0
3000
6000
9000
1.2 104
1.5 104
0 2 4 6 8 10
GLOW_HBRF_11x1_250m_20091005T110050LT
Alt(
m)
9min and 33min Wind Speed Error (m/s)
0
3000
6000
9000
1.2 104
1.5 104
0 2 4 6 8 10
GLOW_HBRF_11x1_250m_20091005T110050LT
Alt(
m)
9min and 33min Wind Dir Error (deg)
G O D D A R D S P A C E F L I G H T C E N T E R
Results from March 2009 Campaign
G O D D A R D S P A C E F L I G H T C E N T E R
Weather Conditionsref0903201250.e
dg 0.742 Cloud ref0903240002.edg 2.0986 Thin Cloud 8-10km
ref0903201918.edg 1.2136 Clear ref0903240249.e
dg 1.7475 Clear
ref0903202057.edg 3.35 Clear ref0903242108.e
dg 2.5064 Thin Cloud 8 and 11km
ref0903210037.edg 0.8791 Clear ref0903250000.e
dg 3.7403 Increasing at 8,11km
ref0903220247.edg 5.1409 Clear ref0903250410.e
dg 2.7287 Increasing at 8,11km
ref0903222005.edg 0.4775 Clear mcs0903301411.
edg2.23472
2 Clear
ref0903222105.edg 0.3003 Clear mcs0903301644.
edg0.56111
1 Clear
ref0903222146.edg 2.0066 Clear mcs0903301721.
edg7.33666
7 Clear
ref0903230005.edg 3.4847 Clear mcs0903310051.
edg1.01361
1 Clear
ref0903230439.edg 2.7164 Clear mcs0903311302.
edg3.50833
3 Thin Clouds at 10
ref0903231856.edg 5.0214 Thin Cloud 8-
10km
G O D D A R D S P A C E F L I G H T C E N T E R
Results from March 2009 Campaign
00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00 00:00 03:00 06:00 09:000
5
10
15
Local Time (ET)
Alti
tude
MS
L (k
m)
Wind speed (m/s)
0
10
20
30
40
50
60
70
00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00 00:00 03:00 06:00 09:000
5
10
15
Local Time (ET)
Alti
tude
MS
L (k
m)
Wind direction (degrees)
200
220
240
260
280
300
320
340
360
March 22-23, 2009
G O D D A R D S P A C E F L I G H T C E N T E R
Results from March 2009 Campaign
12:00 15:00 18:00 21:00 00:00 03:00 06:00 09:00 12:00 15:00 18:000
5
10
15
Local Time (ET)
Alti
tude
MS
L (k
m)
Wind speed (m/s)
0
10
20
30
40
50
60
70
12:00 15:00 18:00 21:00 00:00 03:00 06:00 09:00 12:00 15:00 18:000
5
10
15
Local Time (ET)
Alti
tude
MS
L (k
m)
Wind direction (degrees)
200
220
240
260
280
300
320
340
360
March 30-31, 2009
G O D D A R D S P A C E F L I G H T C E N T E R
Comparison with Radio Sondes
0
3000
6000
9000
1.2 104
1.5 104
-10 0 10 20 30 40 50 60 70
0 50 100 150 200 250 300 350 400
Mar 21 GLOW034301Sonde0330Sonde(m)GLOW(m)Sonde(m)GLOW(m)
Alti
tude
(m)
WindSpd(m/s)
Wind Dir (deg)
G O D D A R D S P A C E F L I G H T C E N T E R
Comparison with Radio Sondes
0
3000
6000
9000
1.2 104
1.5 104
-10 0 10 20 30 40 50 60 70
0 50 100 150 200 250 300 350 400
Mar 23 GLOW022841Sonde0216Sonde(m)GLOW(m)Sonde(m)GLOW(m)
Alti
tude
(m)
WindSpd(m/s)
Wind Dir (deg)
G O D D A R D S P A C E F L I G H T C E N T E R
Comparison with Radio Sondes
0
3000
6000
9000
1.2 104
1.5 104
-10 0 10 20 30 40 50 60 70
0 50 100 150 200 250 300 350 400
Mar 23 GLOW043355Sonde0419Sonde(m)GLOW(m)Sonde(m)GLOW(m)
Alti
tude
(m)
WindSpd(m/s)
Wind Dir (deg)
G O D D A R D S P A C E F L I G H T C E N T E R
Comparison with Radio Sondes
0
3000
6000
9000
1.2 104
1.5 104
-10 0 10 20 30 40 50 60 70
0 50 100 150 200 250 300 350 400
Mar 24 GLOW013852Sonde0123Sonde(m)GLOW(m)Sonde(m)GLOW(m)
Alti
tude
(m)
WindSpd(m/s)
Wind Dir (deg)
Thin Cloud
G O D D A R D S P A C E F L I G H T C E N T E R
Comparison with Radio Sondes
0
3000
6000
9000
1.2 104
1.5 104
-10 0 10 20 30 40 50 60 70
0 50 100 150 200 250 300 350 400
Mar 25 GLOW021136Sonde0154Sonde(m)GLOW(m)Sonde(m)GLOW(m)
Alti
tude
(m)
WindSpd(m/s)
Wind Dir (deg)
Thin Cloud
G O D D A R D S P A C E F L I G H T C E N T E R
Comparison with Radio Sondes
0
3000
6000
9000
1.2 104
1.5 104
-10 0 10 20 30 40 50 60 70
0 50 100 150 200 250 300 350 400
Mar 31 GLOW014651Sonde0128Sonde(m)GLOW(m)Sonde(m)GLOW(m)
Alti
tude
(m)
WindSpd(m/s)
Wind Dir (deg)
G O D D A R D S P A C E F L I G H T C E N T E R
Comparison with IAD Sondes
0
2000
4000
6000
8000
1 104
1.2 104
1.4 104
0 10 20 30 40 50 60
Mar 31 GLOW001315 and 005643 Sonde00Z
IADGLOWAlt(m)
IAD
WindSpd(m/s)
G O D D A R D S P A C E F L I G H T C E N T E R
Summary and Future Work
•Wind measurement on regular basis•Sonde comparison validation
• Continue wind data collection. – 2 to 3 days a week – Coordinate with NWAVES
•Use the GLOW data in WRF model
• Participate field campaigns
G O D D A R D S P A C E F L I G H T C E N T E R
Comparison with Radio Sondes
G O D D A R D S P A C E F L I G H T C E N T E R
Wavelength 354.7 nmTelescope/Scanner Area 0.116 m2
Laser Linewidth (FWHH) 80 MHzLaser Energy/Pulse 25 mJ @ 50ppsEtalon FSR 12 GHzEtalon FWHH 1.7 GHzEdge Channel Separation 5.1 GHzLocking Channel Separation 1.7 GHzInterference filter BW (FWHH) 150 pmPMT Quantum Efficiency 22%
GLOW Lidar System Parameters
G O D D A R D S P A C E F L I G H T C E N T E R
Sampling strategy:• LOS scans at multiple azimuths in repeating cycle (5-10 LOS /cycle)
• Step stare scan pattern at fixed elevation angle (Typ. 45 deg) : 4 cardinal directions (N,S,E,W) + vertical
• Signals are range gated in 30 m bins, integrated and stored every 10 s. Three dwells (30s total) per LOS. Total time to complete scan: ~3 min
Post processing: • data averaged in range (default 250 m)• data can be accumulated in time by LOS (multiples of base 3 min)• corrections for atmos. T and P (RBS)
1
2
3
4
5
1
2
34
5
G O D D A R D S P A C E F L I G H T C E N T E R
Backups
G O D D A R D S P A C E F L I G H T C E N T E R
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)()(v
cos*1*
)()(v
vv v
bygiven is vspeed windthe
,,,;21
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obtained are from Edg2 and Edg1 signals Measured
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x
2y
2x
SensRRRR
SensRRRR
where
WESNiEdgEdgR
Sens
SN
SN
EW
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i
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2
3
4
5
G O D D A R D S P A C E F L I G H T C E N T E R
Combined Molecular Sensitivity vs. T and vT= 150K to 350K , v = 0 to 100 m/s