LASE Measurements During IHOP
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LASE Measurements During IHOP
Edward V. Browell, Syed Ismail, Richard A. Ferrare, Susan A Kooi, Anthony Notari, and Carolyn F. Butler
NASA Langley Research Center, Hampton, Virginia
Funding provided by Dr. Jim Dodge, NASA Headquarters
• LASE water vapor, aerosol, & cloud measurements• Water vapor comparisons• Example of LASE measurements & investigations• Status and future activities
IHOP Data Workshop, Boulder, CO, 24-26 March 2003
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LASE Water Vapor, Aerosol, & Cloud Profiling on NASA DC-8 9 June 2002 (Flt. 9) Morning Low Level Jet and Convective Initiation #3
• Water vapor profiles- daytime and nighttime- 0.2 km to upper trop.- 0.01 to 25 g/kg- accuracy: 6% or 0.01 g/kg- resolution (variable)
vertical: 330 mhorizontal: 14 km (1 min)
• Aerosol/cloud profiles- daytime and nighttime- 0.03 to 25 km-resolution (variable)
vertical: 30 mhorizontal: 200 m
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LASE Water Vapor, Aerosol, & Cloud Profiling on NASA DC-8
• Water vapor profiles- daytime and nighttime- 0.2 km to upper trop.- 0.01 to 25 g/kg- accuracy: 6% or 0.01 g/kg- resolution (variable)
vertical: 330 mhorizontal: 14 km (1 min)
• Aerosol/cloud profiles- daytime and nighttime- 0.03 to 25 km-resolution (variable)
vertical: 30 mhorizontal: 200 m
9 June 2002 (Flt. 9) Morning Low Level Jet and Convective Initiation #3
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LASE Measurements during IHOP • Acquired data on 8 IHOP science flights
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Nighttime Daytime
LASE Water Vapor Comparisons
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LASE - Vaisala & H. AERI Water Vapor Comparisons
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LASE-Dropsonde Water Vapor Comparisons
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May 24, 2002 CI #1 DC-8 Flight 5 18:28-18:53 UT
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May 24, 2002 CI #1 DC-8 Flight 5 19:53-20:18 UT
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LASE CI#2 Flight on 3 June 2002
• Dry line and associated convective evolution (3 LASE passes).• Capping inversion east of dry line near Homestead (H) ground site.
H H H
ConvectionLow Clouds (Descend Under)
Dry Line
Dry Moist
In Situ Measurements
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June 9, 2002 DC-8 Flight 9 Morning LLJ and CI #3
LLJ
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Terra MODIS Precipitable Water Vapor
Terra MODIS 17:45 UT Near IR PWV
Terra MODIS 17:45 UT IR PWV
• June 9, 2002 DC-8 Flight 9• LASE and Terra MODIS measurements within 1 hour• Integrate LASE profiles to
derive PWV
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-104 -103 -102 -101 -100 -99 -980
1
2
3
4
5IHOP June 9, 2002
Latitude 39 N
PW
V (
cm)
Longitude
MODIS Near IR 17:45 UT MODIS IR 17:45 UT LASE 16:50-17:25 UT
-104 -103 -102 -101 -100 -99 -98-30
-20
-10
0
10
20
30MODIS near IR - LASE
Dif
fere
nce
(%
)
Longitude (deg)
MODIS IR - LASE
• MODIS near IR PWV 10-20% higher than LASE
• MODIS IR PWV 0-30% lower than LASE
• Results consistent with DOE ARM SGP PWV comparisons (Ferrare et al., 2002)
Terra MODIS Precipitable Water Vapor
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June 9, 2002 DC-8 Flight 9 Morning LLJ and CI #3
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Forest Fire Smoke
• June 9, 2002 DC-8 Flight 9• Elevated Smoke Layer• HYSPLIT4 backtrajectories show smoke
transported from NM fires• RH computed from LASE water vapor and S-HIS temperature • Increased scattering due to hygroscopic aerosols
HYSPLIT4 (HYbrid Single-Particle Lagrangian Integrated Trajectory) Model, 1997. Web address: http://www.arl.noaa.gov/ready/hysplit4.html, NOAA Air Resources Laboratory, Silver Spring, MD.
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May 30, 2002 DC-8 Flight 6 Boundary Layer Heterogeneity
Start
H C
H HC
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June 14, 2002 DC-8 Flight 11 Boundary Layer Evolution
start
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June 14, 2002 DC-8 Flight 11 Boundary Layer Evolution
start
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LASE Data Status and Future Research Activities
LASE Data Archived:
• LASE nadir water vapor and aerosol scattering ratio measurements from DC-8 are in IHOP data archive and images are on web via Lidar Applications Group Home Page at http://asd-www.larc.nasa.gov/lidar/lidar.html (LASE water vapor profiles >400 m AGL)
Additional LASE Data Processing: • Complete extension of LASE water vapor below 400 m to surface and archive by May 2003• Zenith LASE water vapor and aerosol data processing and archiving by September 2003
Research Activities:• Collaborate with IHOP Science Team in utilizing LASE data in investigating/evaluating:
Development of the convective PBL; Impact on forecasts of CI; Relationship between moisture gradients and LLJ development; Relationships between surface and PBL processes; Impact on quantitative prediction forecasts; Compare water vapor measurements between active and passive sensors for future measurement systems.
• Produce Relative Humidity (RH) profiles using LASE water vapor and temperature profiles (Scanning HIS, NAST-I, AERI, radiosonde, high resolution model)
• Compute Precipitable Water Vapor (PWV) using LASE water vapor profiles• Retrieve cirrus cloud optical and geometrical thickness from LASE cloud profiles• Compare/evaluate other water vapor measurements• Investigate relative humidity and aerosol humidification factor• Characterize vertical distribution of forest fire smoke during IHOP flights• Assess MODIS/MISR aerosol and water vapor measurements