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Multistatic Aerosol Cloud Lidar in Space: A Theoretical PerspectiveAccurate aerosol and cloud retrievals from space remain quite challenging and typically involve solving a severely ill-posed inverse scattering problem. In this Perspective, we formulate in general terms an aerosol and aerosol-cloud interaction space mission concept intended to provide detailed horizontal and vertical profiles of aerosol physical characteristics as well as identify mutually induced changes in the properties of aerosols and clouds. We argue that a natural and feasible way of addressing the ill-posedness of the inverse scattering problem while having an exquisite vertical-profiling capability is to fly a multistatic (including bistatic) lidar system. We analyze theoretically the capabilities of a formation-flying constellation of a primary satellite equipped with a conventional monostatic (backscattering) lidar and one or more additional platforms each hosting a receiver of the scattered laser light. If successfully implemented, this concept would combine the measurement capabilities of a passive multi-angle multi-spectral polarimeter with the vertical profiling capability of a lidar; address the ill-posedness of the inverse problem caused by the highly limited information content of monostatic lidar measurements; address the ill-posedness of the inverse problem caused by vertical integration and surface reflection in passive photopolarimetric measurements; relax polarization accuracy requirements; eliminate the need for exquisite radiative-transfer modeling of the atmosphere-surface system in data analyses; yield the day-and-night observation capability; provide direct characterization of ground-level aerosols as atmospheric pollutants; and yield direct measurements of polarized bidirectional surface reflectance. We demonstrate, in particular, that supplementing the conventional backscattering lidar with just one additional receiver flown in formation at a scattering angle close to 170deg can dramatically increase the information content of the measurements. Although the specific subject of this Perspective is the multistatic lidar concept, all our conclusions equally apply to a multistatic radar system intended to study from space the global distribution of cloud and precipitation characteristics.
Document ID
20170007413
Document Type
Reprint (Version printed in journal)
Authors
Mishchenko, Michael I. (NASA Goddard Inst. for Space Studies New York, NY United States)
Alexandrov, Mikhail D. (Columbia Univ. New York, NY, United States)
Cairns, Brian (NASA Goddard Inst. for Space Studies New York, NY United States)
Travis, Larry D. (NASA Goddard Inst. for Space Studies New York, NY United States)
Date Acquired
August 8, 2017
Publication Date
November 1, 2016
Publication Information
Publication: Journal of Quantitative Spectroscopy and Radiative Transfer
Volume: 184
ISSN: 0022-4073
Subject Category
Earth Resources and Remote Sensing
Report/Patent Number
GSFC-E-DAA-TN34618
Funding Number(s)
CONTRACT_GRANT: NNX14AB99A
Distribution Limits
Public
Copyright
Other
Keywords
aerosols
polarization
electromagnetic scattering
multistatic lidar
clouds