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NASA Ames: P. Russell, J. Redemann, S. Dunagan, R. Johnson, J. Zavaleta PNNL: B. Schmid, C. Flynn, E. Kassianov NASA GS

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NASA Ames: P. Russell, J. Redemann, S. Dunagan, R. Johnson, J. Zavaleta PNNL: B. Schmid, C. Flynn, E. Kassianov NASA GS - PowerPoint PPT Presentation


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4S TAR : S pectrometer for S ky- S canning, S un- T racking A tmospheric R esearch. A collaboration involving:. NASA Ames: P. Russell, J. Redemann, S. Dunagan, R. Johnson, J. Zavaleta PNNL: B. Schmid, C. Flynn, E. Kassianov NASA GSFC: AERONET Team.

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Presentation Transcript
slide1

4STAR:Spectrometer for Sky-Scanning, Sun-Tracking Atmospheric Research

A collaboration involving:

NASA Ames: P. Russell, J. Redemann, S. Dunagan, R. Johnson, J. ZavaletaPNNL: B. Schmid, C. Flynn, E. KassianovNASA GSFC: AERONET Team

slide2

4STAR:Spectrometer for Sky-Scanning, Sun-Tracking Atmospheric Research

AERONET-like

  • Phase function
  • Size mode distributions
  • nre(l), nim(l)
  • Single-scattering albedo
  • Asymmetry parameter
  • Shape
  • Hence aerosol type
  • AATS-14 - like
  • column and profiles
  • Aerosol
  • H2O
  • O3

Improve H2O, O3

Add NO2

Thus improve AOD

Simultaneous spectra yield airborne profiles of aerosol type via Aeronet-like retrievals

slide4

AATS-14

  • NASA Ames
  • Airborne Tracking
  • Sunphotometers
  • Since 1996
  • 13 Field Campaigns
  • >70 Publications

AATS-6

spectrometer for sky scanning sun tracking atmospheric research 4star
Spectrometer for Sky-Scanning, Sun-Tracking Atmospheric Research (4STAR)

Fiber Optics Cable

Optical Entrance

Sun Tracking Head

Motor Feedback Devices

Optical Entrance

Elevation Motor

Aircraft Skin

Azimuth Motor

Slip Ring

Fiber Optics Rotating Joint

key technological hurdles
Key Technological Hurdles
  • Maintaining calibration to 1% over a period of months
  • Stray light rejection: measure skylight within 3° of sun
  • Fiber optic couplings with <1% calibration stability (Connections/Rotation)
  • Sky scan within 100 seconds(10 km in flight)
slide7

Ground Prototype (4STAR-Ground)

Zeiss MCS CCD spectrometer

Quasi-monolithic, no moving parts, ceramic body, Range: 250-1016 nm, Resolution ~ 2 nm

`
direct beam comparison
Direct Beam Comparison

AATS-14

4STAR-Ground

slide10

4STAR-Ground

AERONET Cimel

Jens Redemann

Roy Johnson

radiance calibration
Radiance Calibration

AERONET Cimel

4STAR-Ground

NASA Ames 30” Sphere

slide15

Rotating Fiber Optics Coupling

Throughput Repeatability

next steps
Next steps…
  • New collector design, 100X light volume. Goal: Sky-scan measurements within 100 seconds, 10 km in flight
  • Mauna Loa, spectral Langley calibration
  • Add SWIR spectrometer for more size and absorption information
  • Continue spectral inversion development
  • Harden design for airborne deployment
  • Deploy in 2011: Western Atlantic Tropospheric Aerosol Campaign (WATAC)
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