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Ultra-Stable Spectrometer for Sky-Scanning, Sun-Tracking Atmospheric Research (5STAR)
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Author and Affiliation:
Dunagan, Stephen E.(NASA Ames Research Center, Moffett Field, CA, United States)
Johnson, Roy R.(NASA Ames Research Center, Moffett Field, CA, United States)
Redemann, Jens(NASA Ames Research Center, Moffett Field, CA, United States)
Holben, Brent N.(NASA Goddard Space Flight Center, Greenbelt, MD, United States)
Schmidt, Beat(Pacific Northwest National Lab., Richland, WA, United States)
Flynn, Connor Joseph(Pacific Northwest National Lab., Richland, WA, United States)
Fahey, Lauren(Bay Area Environmental Research Inst., Sonoma, CA, United States)
LeBlanc, Samuel(Bay Area Environmental Research Inst., Sonoma, CA, United States)
Liss, Jordan(Millennium Engineering and Integration Co., Moffett Field, CA, United States)
Kacenelenbogen, Meloe S.(Bay Area Environmental Research Inst., Moffett Field, CA, United States) Show more authors
Abstract: The Spectrometer for Sky-Scanning, Sun-Tracking Atmospheric Research (4STAR) combines airborne sun tracking and sky scanning with diffraction spectroscopy to improve knowledge of atmospheric constituents and their links to airpollution and climate. Direct beam hyperspectral measurement of optical depth improves retrievals of gas constituentsand determination of aerosol properties. Sky scanning enhances retrievals of aerosol type and size distribution.Hyperspectral cloud-transmitted radiance measurements enable the retrieval of cloud properties from below clouds.These measurements tighten the closure between satellite and ground-based measurements. 4STAR incorporates amodular sun-tracking sky-scanning optical head with optical fiber signal transmission to rack mounted spectrometers,permitting miniaturization of the external optical tracking head, and future detector evolution.4STAR has supported a broad range of flight experiments since it was first flown in 2010. This experience provides thebasis for a series of improvements directed toward reducing measurement uncertainty and calibration complexity, andexpanding future measurement capabilities, to be incorporated into a new 5STAR instrument. A 9-channel photodioderadiometer with AERONET-matched bandpass filters will be incorporated to improve calibration stability. A wide dynamic range tracking camera will provide a high precision solar position tracking signal as well as an image of sky conditions around the solar axis. An ultrasonic window cleaning system design will be tested. A UV spectrometer tailored for formaldehyde and SO2 gas retrievals will be added to the spectrometer enclosure. Finally, expansion capability for a 4 channel polarized radiometer to measure the Stokes polarization vector of sky light will be incorporated. This paper presents initial progress on this next-generation 5STAR instrument.
Publication Date: Dec 11, 2017
Document ID:
20170011686
(Acquired Dec 14, 2017)
Subject Category: EARTH RESOURCES AND REMOTE SENSING
Report/Patent Number: ARC-E-DAA-TN45670
Document Type: Conference Paper
Meeting Information: AGU Fall Meeting; 11-15 Dec. 2017; New Orleans, LA; United States
Meeting Sponsor: American Geophysical Union; Washington, DC, United States
Contract/Grant/Task Num: NNA13AC87C; NNH15CO48B; NNX12AD05A
Financial Sponsor: NASA Ames Research Center; Moffett Field, CA, United States
Organization Source: NASA Ames Research Center; Moffett Field, CA, United States
Description: 5p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright; Public use permitted
NASA Terms: ULTRAVIOLET SPECTROMETERS; TRACKING (POSITION); SPECTROSCOPY; ATMOSPHERIC COMPOSITION; OPTICAL THICKNESS; OPTICAL TRACKING; CALIBRATING; AIR POLLUTION; CLIMATE; OPTICAL MEASUREMENT; AEROSOLS; CLOUD PHYSICS; RADIOMETERS; SUN
Other Descriptors: ATMOSPHERE; CLIMATE; POLLUTION; RADIOMETRY; TECHNOLOGY; HYPERSPECTRAL; FIBER OPTIC; POLARIMETRY
Availability Notes: Abstract Only
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Last Modified: December 14, 2017
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