DOE G-1 Research Aircraft
Facility Instrument Summary
November 5, 2008
Stephen R. Springston
Atmospheric Sciences Division
Brookhaven National Laboratory
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Measurements
• State
– Position, T, RFT, IRT, Dew Pt, TDLAS, Gust Probe,
Up/Down UV, SRR (Shake, rattle and roll(sic))
• Aerosol Composition/Cloud Microphysical
Properties
– AMS, PILS, TRAC, LWC, Aerosol N, dN/d log Dp,
CCN, sap, sap = f(l), ssp = f(l)
• Gas-Phase Species
– SO2, O3, CO, Organics
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‘Back of the Envelope’
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State
• Position – Trimble DSM @10 Hz, Trimble TANS
Euler position @10 Hz
• Temperature –
– Total: Rosemount 200 Hz
– Reverse Flow: BNL/NCAR/SEA 200 Hz
– IRT: In optically thick clouds
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State
• Water Vapor –
– Dew Point Hygrometer
– TDLAS (~10 Hz)
• LWC
– Gerber PVM-100, 200 Hz
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State
• Winds, Turbulence (200 Hz) – Gust Probe,
Accelerometer
• Other – Up/Down UV Irradiance
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Aerosol Composition/Cloud
Microphysical Properties
• AMS (cTOF) – Aerodyne Research Incorporated
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Aerosol Composition/Cloud
Microphysical Properties
• PILS – ~3 min
– cations: Na+, K+, Ca++, NH4+
– anions: SO4--, NO3-, Cl-
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Fine Aerosol #
• TSI 3010 (> 10 mm)
• TSI 3025 (> 3 mm)
• DMT CCNs (3 supersaturations: 0.2, 0.28,
0.4%)
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Particles/Clouds
x
Butanol Saturated
Sheath Flow
x
Charger
Aeroso
l
25 oC
Flow
Condenser Separator
y
zx
Separator
• Twin DMAs: 15-440 nm, ~1 min scans
• FIMS: 30-120 nm, ~1 s resolution
Condenser
High Voltage
10 oC
Laser
Laser
Geometry
x
CCD
(Kulkarni and Wang, 2006a,b; Olfert
10 and Wang, 2008)
22 nm particles
y
x
Particles/Clouds
• PCASP: ~0.1 - 3mm, 10 Hz
• CAPS:
– CAS: ~0.6 - 60mm, 10 Hz
• also Particle by Particle (204 individual every 0.1 s)
– CIP: ~25mm – 1.5 mm, 10 Hz
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Aerosol Optical Properties
• TSI 3l Nephelometer
• Photo Thermal Interferometry
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Folded Jamin Interferometer for measurement of aerosol
absorption
It is highly desirable to directly measure aerosol absorption & without interference from aerosol
scattering
Sample chamber
514 nm excitation
Jamin head
Right angle prisms
Retro assembly
6-in
• Insensitive to rotation and tilt
• Simple positional alignment
• Common mode rejection provides increased
mechanical robustness
• Designed to fit into instrument rack
Aerosol Sample inlet
PTS relies on the thermal dissipation of spectrally absorbed energy for its signal
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Aerosol Optical Properties
• Radiance Research 3l PSAP
Noise Characteristics of an Instrumental Particle
Absorbance Technique
Stephen R. Springston and Arthur J. Sedlacek, III
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Example:
tavg = 2 s (as recorded)
tavg = 12 s (boxcar)
tavg = 12 s (avg I, I0)
Gas-Phase Species
• SO2: TEI Model 43S, UV fluorescence
~200-500 pptv @ 4 s resolution
• Organics: PTRMS
• CO: VUV fluorescence ~1-2 ppbv @ 5 s
resolution
• O3: TEI Model 49-100, UV photometry
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Gas-Phase Species
• O3: Solid-State Chemiluminescence, BNL
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After the Flight
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After the Flight
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~200 Mb/hour
Processed to .pdf, .txt, and other
Quick look ~3 hours,
Preliminary post ~1 day
ftp://ftp.asd.bnl.gov/pub/ASP%20Field%20
Programs/2008VOCALS/
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