Aerosol sensing from balloons using photopolarimetry
A photopolarimeter designed to measure the radiance and the polarization ratio at lambda equals 0.85 microns and lambda equals 1.65 microns is set up on a gondola of a stratospheric balloon. By rotating the gondola, measurements of the diffuse solar light are obtained for a wide range of the scatter...
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1991
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ftnasantrs:oai:casi.ntrs.nasa.gov:19910023224 2023-05-15T15:08:42+02:00 Aerosol sensing from balloons using photopolarimetry Santer, R. Diallo, B. S. Herman, M. Unclassified, Unlimited, Publicly available Feb 1, 1991 http://ntrs.nasa.gov/search.jsp?R=19910023224 unknown http://ntrs.nasa.gov/search.jsp?R=19910023224 Accession ID: 91N32538 No Copyright Other Sources 46 NASA. Ames Research Center, International Workshop on Stratospheric Aerosols: Measurements, Properties, and Effects; p 56 1991 ftnasantrs 2012-02-15T18:52:03Z A photopolarimeter designed to measure the radiance and the polarization ratio at lambda equals 0.85 microns and lambda equals 1.65 microns is set up on a gondola of a stratospheric balloon. By rotating the gondola, measurements of the diffuse solar light are obtained for a wide range of the scattering angles. An inversion scheme, based on the assumption of a log-normal size distribution, provides the relevant size parameters, the refractive index, and the slant optical thicknesses of the aerosols. Since 1983, this experiment was launched twice a year from Aire Sur Adour (S-E of France). The post-El Chichon atmospheric stratospheric aerosol proved to be quite stable in size and nature (hydratid sulfuric acid), but the abundance decreased by a factor of 10 between 1983 and 1987. The experiment was also launched to observe the stratosphere during the Arctic winter. Two flights, on January 28, 1988 and January 18, 1990, corresponded to an unperturbed atmosphere. But during a third flight, on April, 2, 1990, the temperatures were low enough for PCS formulations. A multilayer situation was observed with the standard H2SOH aerosols below 20 km; a dense layer was observed, peaked at around 23 km, with scattering coefficients about 50 times layer than in background conditions; and an upper layer was observed, rather sharp (approximately equal to 1 km), with micron sized particles. Other/Unknown Material Arctic NASA Technical Reports Server (NTRS) Arctic Lambda ENVELOPE(-62.983,-62.983,-64.300,-64.300) |
institution |
Open Polar |
collection |
NASA Technical Reports Server (NTRS) |
op_collection_id |
ftnasantrs |
language |
unknown |
topic |
46 |
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46 Santer, R. Diallo, B. S. Herman, M. Aerosol sensing from balloons using photopolarimetry |
topic_facet |
46 |
description |
A photopolarimeter designed to measure the radiance and the polarization ratio at lambda equals 0.85 microns and lambda equals 1.65 microns is set up on a gondola of a stratospheric balloon. By rotating the gondola, measurements of the diffuse solar light are obtained for a wide range of the scattering angles. An inversion scheme, based on the assumption of a log-normal size distribution, provides the relevant size parameters, the refractive index, and the slant optical thicknesses of the aerosols. Since 1983, this experiment was launched twice a year from Aire Sur Adour (S-E of France). The post-El Chichon atmospheric stratospheric aerosol proved to be quite stable in size and nature (hydratid sulfuric acid), but the abundance decreased by a factor of 10 between 1983 and 1987. The experiment was also launched to observe the stratosphere during the Arctic winter. Two flights, on January 28, 1988 and January 18, 1990, corresponded to an unperturbed atmosphere. But during a third flight, on April, 2, 1990, the temperatures were low enough for PCS formulations. A multilayer situation was observed with the standard H2SOH aerosols below 20 km; a dense layer was observed, peaked at around 23 km, with scattering coefficients about 50 times layer than in background conditions; and an upper layer was observed, rather sharp (approximately equal to 1 km), with micron sized particles. |
format |
Other/Unknown Material |
author |
Santer, R. Diallo, B. S. Herman, M. |
author_facet |
Santer, R. Diallo, B. S. Herman, M. |
author_sort |
Santer, R. |
title |
Aerosol sensing from balloons using photopolarimetry |
title_short |
Aerosol sensing from balloons using photopolarimetry |
title_full |
Aerosol sensing from balloons using photopolarimetry |
title_fullStr |
Aerosol sensing from balloons using photopolarimetry |
title_full_unstemmed |
Aerosol sensing from balloons using photopolarimetry |
title_sort |
aerosol sensing from balloons using photopolarimetry |
publishDate |
1991 |
url |
http://ntrs.nasa.gov/search.jsp?R=19910023224 |
op_coverage |
Unclassified, Unlimited, Publicly available |
long_lat |
ENVELOPE(-62.983,-62.983,-64.300,-64.300) |
geographic |
Arctic Lambda |
geographic_facet |
Arctic Lambda |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Other Sources |
op_relation |
http://ntrs.nasa.gov/search.jsp?R=19910023224 Accession ID: 91N32538 |
op_rights |
No Copyright |
_version_ |
1766340003952066560 |