Meteorological measurements made during RxCADRE Doppler wind lidar measurements ... Potential...
Transcript of Meteorological measurements made during RxCADRE Doppler wind lidar measurements ... Potential...
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Craig B. Clements, Daisuke Seto, Jon Contezac, and Braniff Davis
Fire Weather Research Laboratory Department of Meteorology and Climate Science
San José State University San José, CA
4th Fire Behavior and Fuels Conference Raleigh, NC
Meteorological Measurements made during RxCADRE
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Overview
• Instrumentation and Experimental Design - Overview of CSU-MAPS
• Data Processing
• Preliminary Results - Tower measurements: Fire front micrometeorology - Doppler wind lidar measurements
• Summary and Conclusions
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Halo
California State University
1. 32-m extendable meteorological tower. 2. 2012 Ford F250 4x4 Crew Cab 3. Halo Photonics, Streamline 75 Doppler Lidar
4. Radiometrics, MP3000A Microwave Profiler 5. Vaisala DigiCora MW31 radiosonde system
Lidar Microwave
Profiler
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TowerWorx, MAG-106 steel tower-trailer - GVW: 8200 lbs - 32 m maximum height - deploys with 2-persons, ~30 min - uses outriggers, no guying - instruments prewired
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CSU-MAPS Tower instrumentation
Up to 6 measurement levels: four fixed: 9,15, 22, 32 m AGL Sensors: - HMP45C Temp/RH sensor - Gill 2-D windsonic anemometer - CSI CSAT 3-d sonic (two) - Licor 7500 CO2/H2O analyzer - CSI CR1000, CR3000 loggers
- Powered by 70 W Solar panel
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Experimental Design
L2F
L2G
L1G
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CSU-MAPS: Ambient Meteorology (S7-S9)
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Sounding: 4 Nov 2012
Potential Temperature (K) Water Vapor Mixing Ratio (g kg-1)
Wind Speed (m s-1) Wind Direction (°)
Hei
ght (
m A
GL)
H
eigh
t (m
AG
L)
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Sounding: 7 Nov 2012
Potential Temperature (K) Water Vapor Mixing Ratio (g kg-1)
Wind Speed (m s-1) Wind Direction (°)
Hei
ght (
m A
GL)
H
eigh
t (m
AG
L)
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Sounding: 10 Nov 2012
Potential Temperature (K) Water Vapor Mixing Ratio (g kg-1)
Wind Speed (m s-1) Wind Direction (°)
Hei
ght (
m A
GL)
H
eigh
t (m
AG
L)
1000 1410
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Sounding: 11 Nov 2012
Potential Temperature (K) Water Vapor Mixing Ratio (g kg-1)
Wind Speed (m s-1) Wind Direction (°)
Hei
ght (
m A
GL)
H
eigh
t (m
AG
L)
0945 1549
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Meteorology at the fire front do not represent ambient conditions. The FFP is characterized by: • Increase in velocity field u, v, w, and temperature, T. • Surface wind reversal • Peak in turbulence and sensible heat flux. • Minimum in atmospheric pressure • Strength of each determines fire-atmosphere coupling.
Micrometeorology of Fire Front Passage (FFP)
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Tower Instrumentation Two 3-D sonic anemometers: (ATI, SATI-Sx probe) 2 m and 6 m AGL Fine-wire thermocouples (Omega, Inc), every 1 m, 1-9 m AGL Hukseflux SBG-01: total heat flux radiometer: 2.8 m Medtherm 64: radiative heat flux radiometer: 2.8 m Campbell Scientific Inc, CR3000 data logger, CFM card reader, 2 GB card Clock locked to GPS
Raw data sampled at 10 Hz; TCs at 5 Hz
6 m ATI sonic
2 m ATI sonic
2.8 m radiometers
Thermocouples 1 -6 m
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Raw 10 Hz time series of u,v,w,ts are: 1. Despiked using 3σ for pre, and post FFP 1. FFP is visually inspected (or despiking is applied).
2. 30 min u, v rotated into stream-wise, cross-wind
directions; w is tilt-corrected (planar-fit method). 1. 15 min average is used to calculated perturbations for
turbulent statistics
Data Processing: 10 Hz time series
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10:30 11:00 11:30 12:00 12:30 13:00 13:30 14:00 14:3020
30
40
50
60
70
80
90
100
110
Ts
Data Processing: Turbulence Spectra
• Wind velocity and temperature (10 Hz): – U: mean wind direction – V: lateral wind direction – W: tilt-corrected, vertical velocity – Ts: sonic temperature
• Define Pre-, During-, Post-Fire Front Passage (FFP) • Fast Fourier Transform (FFT) / Wavelet Transform
0.001 0.01 0.1 1 100.001
0.01
0.1
1
10
f = frequency
fS(f)
rawsmoothed
Post-FFP
During-FFP
Pre-FFP
Tem
pera
ture
(°C
)
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Turbulent Kinetic Energy (TKE) is the sum of velocity variances: Turbulent Sensible Heat Flux (Hs) is calculated by eddy-covariance from To isolate FFP, 1 min averages are calculated
Data Processing: Turbulent Statistics
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Tower Time Series: 10 Hz processed
S3 S4 S5
(m s
-1)
(m s
-1)
(m s
-1)
Tem
pera
ture
(C)
U
V
W
Ts
Time (CST)
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Time Series: 10 Hz processed
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Tower Time Series: 10 Hz processed
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Turbulence Kinetic Energy and Heat Flux
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Convective and Radiative Heat Fluxes
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Comparison of Heat Fluxes: Eddy Covariance vs. Radiometric Measurements
Eddy covariance
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16:26:00 16:27:00 16:28:001
2
3
4
5
6
20
40
60
80
100
120
Near-Surface Thermodynamic Plume Structure (Plot S3)
Hei
ght (
m A
GL)
Time (CST)
(Temperature (C
)
Fine-Wire TCs, 1 Hz
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The RxCADRE Project Doppler Lidar deployed during S7
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Doppler Radial Velocity and Backscatter: S7
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Thank you!
Doppler Radial Velocity and Backscatter: S8
18:44:08 UTC
18:39:22 UTC 18:37:05 UTC
18:41:51 UTC
Elevation angle: 2.5°
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Doppler Radial Velocity: LG2
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18:24:47 18:25:10
18:26:35 18:30:12
Doppler Radial Velocity: LG2
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Conclusions
• Overall, data quality is high!
• In situ tower data shows FFP structure and fire-atmosphere coupling • Doppler Lidar scans are able to track plume boundaries • Lidar beam able to penetrate plume, but some attenuation occurs downstream Future work 1. Correlate lidar plume boundaries with UAS fire front 2. Calculate turbulent spectra from time series data 3. Compare heat fluxes to others measured
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Acknowledgements
Dave Grimm and Keith Hawk (Eglin AFB FD)
Joint Fire Science Program (JFSP #11-2-1-11)
National Science Foundation (AGS# 0960300)