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A multi-agency collaboration involving PNNL, NASA Ames, NASA GSFC, and more!

4STAR: Spectrometer for Sky-Scanning, Sun-Tracking Atmospheric Research Results from TCAP Summer 2012 Flights. A multi-agency collaboration involving PNNL, NASA Ames, NASA GSFC, and more! PNNL: Connor Flynn , J. Hubbe, E. Kassianov, B. Schmid

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A multi-agency collaboration involving PNNL, NASA Ames, NASA GSFC, and more!

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  1. 4STAR: Spectrometer for Sky-Scanning, Sun-Tracking Atmospheric ResearchResults from TCAP Summer 2012 Flights A multi-agency collaboration involving PNNL, NASA Ames, NASA GSFC, and more! PNNL:Connor Flynn, J. Hubbe, E. Kassianov, B. Schmid NASA Ames: S. Dunagan, R. Johnson, M. Kacenelenbogen, J. Redemann, P. Russell, M. Segal Rozenhaimer, Y. Shinozuka, S. Ramachandran NASA GSFC: B. Holben, S. Sinyuk Funding: DOE ARM, NASA, BMI, PNNL

  2. AERONET-like capability • Ground-based direct beam + sky scanning yields column-integrated properties: • AOD • Size distributions • Single-scattering albedo • Asymmetry parameter • Aerosol shape / sphericity • Cloud OD, cloud properties 4STAR: Spectrometer for Sky-Scanning, Sun-Tracking Atmospheric Research AATS-like capability: AOD at 13 wavelengths & H2O horizontally and vertically resolved through airborne design and deployment So, what really is 4STAR? What does it measure? Airborne hyperspectral measurements of direct sunlight and angularly resolved sky radiance. 2

  3. Field campaign overview • 4STAR operated successfully on ALL flights, TCAP I & II • Acquired direct sun measurements and AODs in all TCAP I flights, most TCAP II flights and from the ground. • Favorable sky scans on 4 days in TCAP I, even more during TCAP II, • Numerous flight legs operated in zenith cloud mode. • Yohei Shinozuka leading a paper comparing 4STAR, HSRL, and G1 scattering+absorptionmeasurements from TCAP I.

  4. AOD comparisons and CWV repeatability 4STAR on G-1, n = 4 AERONET at the Ground Site 4STAR on ground, n = 23 AERONET at the Airport 4

  5. Conclusions: • 4STAR had an outstanding first field campaign! • Comparisons of AOD with surface and in-situ aerosol optical properties look strong. • Water and trace gas retrievals show good potential. • First-ever hyperspectral airborne sky scans collected. Initial AIP retrievals are mostly encouraging but much validation work remains. • Zenith-mode cloud radiances collected with concurrent upwelling at 6 MFR wavelengths from 415-1640 nm. • What is the down-side? 5

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