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Proceedings Paper

WindCam and MSPI: two cloud and aerosol instrument concepts derived from Terra/MISR heritage
Author(s): David J. Diner; Michael Mischna; Russell A. Chipman; Ab Davis; Brian Cairns; Roger Davies; Ralph A. Kahn; Jan-Peter Muller; Omar Torres
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Paper Abstract

The Multi-angle Imaging SpectroRadiometer (MISR) has been acquiring global cloud and aerosol data from polar orbit since February 2000. MISR acquires moderately high-resolution imagery at nine view angles from nadir to 70.5°, in four visible/near-infrared spectral bands. Stereoscopic parallax, time lapse among the nine views, and the variation of radiance with angle and wavelength enable retrieval of geometric cloud and aerosol plume heights, height-resolved cloud-tracked winds, and aerosol optical depth and particle property information. Two instrument concepts based upon MISR heritage are in development. The Cloud Motion Vector Camera, or WindCam, is a simplified version comprised of a lightweight, compact, wide-angle camera to acquire multiangle stereo imagery at a single visible wavelength. A constellation of three WindCam instruments in polar Earth orbit would obtain height-resolved cloud-motion winds with daily global coverage, making it a low-cost complement to a spaceborne lidar wind measurement system. The Multiangle SpectroPolarimetric Imager (MSPI) is aimed at aerosol and cloud microphysical properties, and is a candidate for the National Research Council Decadal Survey's Aerosol-Cloud-Ecosystem (ACE) mission. MSPI combines the capabilities of MISR with those of other aerosol sensors, extending the spectral coverage to the ultraviolet and shortwave infrared and incorporating high-accuracy polarimetric imaging. Based on requirements for the nonimaging Aerosol Polarimeter Sensor on NASA's Glory mission, a degree of linear polarization uncertainty of 0.5% is specified within a subset of the MSPI bands. We are developing a polarization imaging approach using photoelastic modulators (PEMs) to accomplish this objective.

Paper Details

Date Published: 20 August 2008
PDF: 9 pages
Proc. SPIE 7081, Earth Observing Systems XIII, 70810T (20 August 2008); doi: 10.1117/12.795146
Show Author Affiliations
David J. Diner, Jet Propulsion Lab. (United States)
Michael Mischna, Jet Propulsion Lab. (United States)
Russell A. Chipman, Univ. of Arizona College of Optical Sciences (United States)
Ab Davis, Jet Propulsion Lab. (United States)
Brian Cairns, NASA Goddard Institute for Space Studies (United States)
Roger Davies, The Univ. of Auckland (New Zealand)
Ralph A. Kahn, NASA Goddard Space Flight Ctr. (United States)
Jan-Peter Muller, Univ. College London (United Kingdom)
Omar Torres, Hampton Univ. (United States)

Published in SPIE Proceedings Vol. 7081:
Earth Observing Systems XIII
James J. Butler; Jack Xiong, Editor(s)

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