autonomous unmanned aerial vehicles as a tool …...autonomous unmanned aerial vehicles as a tool...
TRANSCRIPT
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Autonomous Unmanned Aerial Vehicles as a Tool for Measuring
Cloud-Aerosol-Radiation- Chemistry
Scripps Institution of Oceanography
V Ramanathan, Craig Corrigan, D Kim, H Nguyen, M Ramana, Greg Roberts
ARM Aerial Vehicle Program science team meeting, Monterey; March 29, 2007
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Outline
• Introduction• MAC Campaign• Radiation Results• Aerosol Results• Future Missions and Collaborations
– Possible Experiment with DOE
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Advantages of Using Lightweight AUAVs
• Complement manned aircraft missions • Inexpensive, routine operation• Fly coordinated missions with multiple
aircraft• Can fly in risky environments• Can operate from remote locations (ships,
islands, etc.)
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Weight - 23 kg (takeoff)Wingspan - 2.7 metersCruise velocity - 35 m/sPayload - 5 kgFlight duration - 5+ hoursManual or Catapult Launch Autonomous GPS flightSatellite communication link
ACR Manta
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Scripps PayloadDesign & Integration
Initial development
Jan. – May ‘03
MALDIVES
Oct. ‘04El Mirage, CA
Sept. ‘04Seattle, WA
July ‘04El Mirage, CA
Dec. ‘03Seattle, WA
Sept. ‘03
Tucson, AZ
July ‘05MALDIVES
Mar. ’06El Centro, CA
Nov. ‘05Yuma, AZ
Aug. ‘05Tucson, AZ
May ‘05
Test FlightsInstrumented Flights
Experiments
2003 2003 –– 20042004
2005 2005 –– 20062006
Sept. ‘03Sept. Sept. ‘‘0303 Oct. ‘04Oct. Oct. ‘‘0404
Nov. ‘05Nov. Nov. ‘‘0505May. ‘05May. May. ‘‘0505
Thanks Mari
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Necessary to Shrink Instruments
CommercialUAV version
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Optical Particle Counter (580 g)Optical Particle Counter (580 g)NOPC; 0.3 < Dp < 3 μm
PyranometerPyranometer (190 g)(190 g)irradiance 0.3 – 2.8 μm
Cloud Droplet Spectrometer Cloud Droplet Spectrometer (1.4 kg)(1.4 kg) distr. 1 < D < 50 μm
Aerosol inlet & splitter (150 g)Aerosol inlet & splitter (150 g)unbiased aerosol sampling
Aethalometer (820 g)Aethalometer (820 g)absorbing aerosol
PAR radiometer (45 g)PAR radiometer (45 g)irradiance 400 – 700 nm
Video camera (280 g)Video camera (280 g)cloud targeting
Miniaturized Miniaturized Instruments for Instruments for
UAVUAV
LWC probe (450 g)LWC probe (450 g)Cloud water (g m-3)
Condensation Particle Counter Condensation Particle Counter (870 g)(870 g) NCN; Dp > 10 nm
T/RH probe (50 g)T/RH probe (50 g)Temperature & RH
[=] 1 inch
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The Maldives Autonomous Unmanned Aerial Vehicle Campaign (MAC)06 March - 01 April, 2006
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The Maldives Autonomous Unmanned Aerial Vehicle Campaign (MAC)06 March - 01 April, 2006
Science Team: Scripps Institution of OceanographyV. Ramanathan (PI)H. Nguyen (Mission Director)C. Corrigan (Aerosols)M.V. Ramana (Radiation)G. Roberts (Lead Instrument Scientist)
Flight Team: Advanced Ceramic ResearchA. Mulligan (Project Director)M. Patterson (Project Manager)L. Wardell (Project Leader)P. Corcoran (Pilot-in-Command)E. Hooper (Pilot)R .A.G. Pineda (Pilot)
NSF/NOAA/NASA/Vetlesen/Alderson
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Maldives AUAV Campaign(MAC) Objectives
1. Technology demonstration 2. Vertical profiles of aerosols, clouds and
radiation fluxes 3. Direct measurement of solar absorption and
heating rates in the atmosphere4. Linking aerosols with atmospheric solar
absorption and cloud microphysical properties5. Required stacked flight missions to observe
atmospheric layers and clouds simultaneously from above, below, and within.
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MAC Papers Communicated1. Capturing Vertical Profiles of Aerosols and Black Carbon
over the Indian Ocean Using Autonomous Unmanned Aerial Vehicles (Corrigan et al., submitted GRL)
2. Albedo, Atmospheric Solar Absorption, and Atmospheric Heating Rate Measurements with Lightweight Autonomous Stacked UAVs (Ramana et al., submitted QJRMS)
3. Stacked UAVs Link Large Solar Heating by Brown Clouds with Retreat of Himalayan Glaciers (Ramanathan et al., submitted to Nature)
4. Direct observations of aerosol-cloud interactions using UAVs as new tools in atmospheric sciences (Roberts et al., to be submitted to Science)
5. Instrument Development Technical Paper (Roberts et al., in preparation.)
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Large Map
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Hanimaadhoo Island
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Maldives Climate Observatory -Hanimaadhoo (MCOH)
Project Atmospheric Brown Cloud
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3.9 kg5.3 kg5.4 kgTotal weight
√√√
√√
√√√
√
√√
√
√
√√√
√√√
√√
√√√
√
AerosolTotal particle concentrationSize distributionBlack carbon and absorption
RadiationUp/Down PyranometerUP/Down PAR
CloudsCloud droplet probe Liquid water content probe
MeteorologyTemperatureRelative HumidityPressure
Aerosol inlet systemData Acquisition systemVideo Camera + DownlinkMiscellaneous + Batteries
Below Cloud
In-Cloud
Above Cloud
Instruments
MAC Lightweight Instrumentation
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3 km asl
MAC Stacked UAV Flight Configuration
In cloud
100 m below cloud
Surface observations
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Validation with Ground Observations
UAV - PAR
UAV-Pyranometer
MCOH-Pyranometer
MCOH - PAR
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Wing tip to Wing tip comparison
Ramana et al., 2007
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900 950 1000 1050 1100 1150 1200900
950
1000
1050
1100
1150
1200
Measured Broadband flux, Wm-2
MA
CR B
road
band
flux
, Wm-2 Altitude = 3050m
Mean Bias = 8.31RMSE = 14.16
900 950 1000 1050 1100 1150 1200900
950
1000
1050
1100
1150
1200
Measured Broadband flux, Wm-2M
ACR
Bro
adba
nd fl
ux, W
m-2 Altitude = 2590mMean Bias = 4.78RMSE = 7.36
900 950 1000 1050 1100 1150 1200900
950
1000
1050
1100
1150
1200
Measured Broadband flux, Wm-2
MA
CR B
road
band
flux
, Wm-2 Altitude = 2130m
Mean Bias = -1.08RMSE = 9.38
900 950 1000 1050 1100 1150 1200900
950
1000
1050
1100
1150
1200
Measured Broadband flux, Wm-2
MA
CR B
road
band
flux
, Wm-2 Altitude = 1520m
Mean Bias = 7.79RMSE = 10.78
900 950 1000 1050 1100 1150 1200900
950
1000
1050
1100
1150
1200
Measured Broadband flux, Wm-2
MA
CR B
road
band
flux
, Wm-2 Altitude = 1200m
Mean Bias = -7.49RMSE = 10.22
900 950 1000 1050 1100 1150 1200900
950
1000
1050
1100
1150
1200
Measured Broadband flux, Wm-2
MA
CR B
road
band
flux
, Wm-2 Altitude = 940m
Mean Bias = 8.99RMSE = 13.23
Incoming broadband flux comparison: MAC vs MACR (cloud-free day)
Ramana et al., 2007
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Reflected flux comparison: MAC vs MACR (cloud-free day)
Broadband
Visible
Ramana et al., 2007
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Simultaneous observations of clouds and radiometric fluxesSimultaneous observations of clouds and radiometric fluxes
24-Mar-06055311Z
796 maslgrid: 100 m
distance: 1250 m
a. b.
Roberts et al., 2007
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Albedo: Broadband & Visible (near cloud-free days)
Ramana et al., 2007
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Atmospheric Absorption and Heating rate : cloud-free day
Ramana et al., 2007
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Diurnal mean Atmospheric Absorption and Heating rates between 0.5-3.0 km (cloud-free day)
0.040.25±0.020.29±0.171.27.2 ± 18.3 ± 4.7Visible(0.4-0.7 µm)
1.191.59±0.051.53±0.2634.145.4 ± 241.2±7.5Broadband(0.3-2.8µm)
MACR{without aerosols}
MACRMACMACR{without aerosols}
MACRMAC
Heating rate, K.Day-1
0.5 – 3.0 kmAbsorption, Wm-2
0.5 – 3.0 kmSpectral
range
Ramana et al., 2007
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Ramanathan et al., 2007
0 5 10 150
0.5
1
1.5
2
2.5
3
Alti
tude
(km
)
Abs Coef (Mm-1)
[a]
0 0.5 1 1.5 2 2.5 30
0.5
1
1.5
2
2.5
3
H (K/day)
[b][b][b]
031303140315
0 0.5 1 1.5 2 2.5 30
0.5
1
1.5
2
2.5
3
H (K/day)
[c][c][c][c][c][c][c][c][c][c][c][c][c][c][c]
0320032103220323032403280329
0 0.5 1 1.50
0.5
1
1.5
2
2.5
3
ΔH (K/day)
[d]
MACRGCMMAC
Atmospheric Heating rate : during the MAC experiment
MarineContinental
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MAC Results – Vertical Profiling
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Methods for data quality assurance
• Laboratory calibrations • On-site calibration/comparison with
established instruments (MCOH)• Pre-flight readings• Inter-plane comparison• Fly-by of ground station
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Surface and UAV Absorption Comparison(Aethalometer).
Corrigan et al., 2007
0
1
2
3
4
5
6
7
8
200 300 400 500 600 700 800 900 1000Wavelength, nm
Abs
. Coe
ff., M
m-1
UAVSurface
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Cross-platform Comparison of Total Particle Counter
0
500
1000
1500
2000
2500
3000
3500
4000
0 500 1000 1500 2000 2500 3000 3500
CPC concentration (#/cm3)
Alti
tude
(m)
UAV1UAV2
Corrigan et al., 2007
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Atmospheric Layers
0
500
1000
1500
2000
2500
3000
3500
0 1000 2000 3000
Total Particle Concentration (#/cm3)
Alti
tude
(m)
0
500
1000
1500
2000
2500
3000
3500
300 320 340 360 380 400Potential Temperature (K)
Th ETh EsθEθES
Corrigan et al., 2007
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Total Particle Concentration during MAC
Corrigan et al., 2007
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Aerosol Size Distribution from Clean and Polluted Periods
March 6 March 29
Corrigan et al., 2007
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Black Carbon Vertical Profiles during MAC
0
2,000
4,000
6,000
8,000
10,000
12,000
0 0.2 0.4 0.6 0.8 1Black Carbon, μg/m3
Alti
tude
(fee
t)
6-Mar16-Mar23-Mar24-Mar29-Mar
Corrigan et al., 2007
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Upcoming Projects
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Future Missions Planned by our Team
Airborne observatories for profiling aerosol-chemistry-air pollution
•CAPPS (funded by CEC) (2007- )
Multi-UAV missions for aerosol-cloud-radiation
•Marine stratocumulus clouds (June ‘08?)- Possible experiment with DOE
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CAPPS(California AUAV Air Pollution Profiling Study)
Funded by Calif. Energy Commission.
• Collect an annual record of aerosol, black carbon, ozone, NOx and CO pollution concentrations from surface up to 12,000 feet asl.
• California generated pollution vs. long-rangepollution from other regions.
• Look at the impact of pollution layers on radiative forcing to quantify the amount of solar dimming.
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Asian particulate pollution transported to North America
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Measurements for CAPPS
• Aerosol Number Concentration• Aerosol Size Distribution (0.3 – 3 μm)• Aerosol Absorption/Black Carbon
Concentration• Ozone• CO• NOx/NO/NO2• Temperature, Pressure, Relative Humidity
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130 ° W 125° W 120° W 115 ° W 110° W 30 ° N
35 ° N
40 ° N
45 ° N
Possible Flight Locations for CAPPS
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Marine Stratocumulus Cloud(possible experiment with DOE ?)
A definitive experiment to investigate absorption in cloudy skies. Can we understand using known physics and chemistry?
- Atmospheric Absorption- Albedo enhancement
• May-June, 2008/2009Off the coast of San Diego
Was discussed at ARM La Jolla Workshop by Wiscombe, Marshak, Barker, and Ramanathan.
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Vertical Profiling
3 km asl
Cloud Absorption Experiment:
above cloud
In cloud
below cloud
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Planned Instrumentation
MAC instruments and the following:
• Spectro-radiometers• Stabilizing platforms for radiometers• LWC probe• Improved absorption photometer• Gas chemistry – CO, Ozone, NOx• CCN• Gust Probe
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