| Scattering properties of sands. 2. Results for sands from different origins. | |
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MedLine Citation:
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PMID: 20563208 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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Mineral sand is a major component of aerosols in the atmosphere. It is necessary to have a laboratory database to interpret the remote sensing measurements of light scattered by such grains. For this purpose, the PROGRA2 experiment is dedicated to the retrieval of polarization and brightness phase curves, in the visible wavelength domain, of various grains that can be found in Earth's atmosphere and in space. The measurements of the scattered light by levitating clouds of grains are conducted at two wavelengths, 632.8 and 543.5nm, with PROGRA2-VIS. Large grains (at least tens of micrometers) are studied in microgravity conditions during parabolic flights; smaller (micrometer-sized) grains are lifted by an air draught in ground-based conditions. The PROGRA2-SURF instrument allows measurements on the grains deposited on a plane surface, at the same wavelengths. New data for the scattering properties are presented for sands of various origins, including fine clay. The polarimetric phase curves for levitating grains are close to each other for all the samples (except for black sands); small discrepancies are mainly due to grains' light absorption differences. The polarization curves for levitating grains differ strongly from those of deposited grains (dry or wet). In particular, these curves can be used to interpret remote sensing measurements to distinguish between grains at ground and grains transported by winds. |
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Authors:
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Jean-Baptiste Renard; Mirvatte Francis; Edith Hadamcik; Daniel Daugeron; Benoît Couté; Bertrand Gaubicher; Matthieu Jeannot |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Applied optics Volume: 49 ISSN: 1539-4522 ISO Abbreviation: Appl Opt Publication Date: 2010 Jun |
Date Detail:
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Created Date: 2010-06-21 Completed Date: 2010-10-08 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0247660 Medline TA: Appl Opt Country: United States |
Other Details:
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Languages: eng Pagination: 3552-9 Citation Subset: - |
Affiliation:
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Laboratoire de Physique et Chimie de l'Environnement et de l'Espace/Université d'Orléans,3A Avenue de la Recherche Scientifique, F-45071 Orléans cedex 2, France. jbrenard@cnrs-orleans.fr |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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