A42A-04: Determination of Cloud Thermodynamic Phase with Ground Based, Polarimetrically Sensitive, Passive Sky Radiometers
When observed from the ground, optically thick clouds minimally polarize light, while the linear polarization direction (angle) of optically thin clouds contains information about thermodynamic phase. For instruments such at the Cimel radiometers that comprise the AErosol RObotic NEtwork (AERONET),...
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ftnasantrs:oai:casi.ntrs.nasa.gov:20190001354 2023-05-15T13:06:01+02:00 A42A-04: Determination of Cloud Thermodynamic Phase with Ground Based, Polarimetrically Sensitive, Passive Sky Radiometers Dunagan, Stephen Marshak, Alexander Slutsker, Ilya van Diedenhoven, Bastiaan Holben, Brent Knobelspiesse, Kirk Unclassified, Unlimited, Publicly available December 14, 2015 application/pdf http://hdl.handle.net/2060/20190001354 unknown Document ID: 20190001354 http://hdl.handle.net/2060/20190001354 Copyright, Public use permitted CASI Earth Resources and Remote Sensing ARC-E-DAA-TN29258 AGU Fall Meeting; 14-18 Dec. 2015; San Francisco, CA; United States 2015 ftnasantrs 2019-07-20T23:05:26Z When observed from the ground, optically thick clouds minimally polarize light, while the linear polarization direction (angle) of optically thin clouds contains information about thermodynamic phase. For instruments such at the Cimel radiometers that comprise the AErosol RObotic NEtwork (AERONET), these properties can also be exploited to aid cloud optical property retrievals. Using vector radiative transfer simulations, we explore the conditions most favorable to cloud thermodynamic phase determination, then test with actual AERONET data. Results indicate that this technique may be appropriate for some, but not all, conditions, and motivate a deeper investigation about the polarization direction measurement capability of Cimel instruments, which to date have been primarily used to determine degree of polarization. Recent work explores these measurement issues using a newly installed instrument at the NASA Ames Research Center in Moffett Field, California. Other/Unknown Material Aerosol Robotic Network NASA Technical Reports Server (NTRS) |
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Open Polar |
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NASA Technical Reports Server (NTRS) |
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ftnasantrs |
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unknown |
topic |
Earth Resources and Remote Sensing |
spellingShingle |
Earth Resources and Remote Sensing Dunagan, Stephen Marshak, Alexander Slutsker, Ilya van Diedenhoven, Bastiaan Holben, Brent Knobelspiesse, Kirk A42A-04: Determination of Cloud Thermodynamic Phase with Ground Based, Polarimetrically Sensitive, Passive Sky Radiometers |
topic_facet |
Earth Resources and Remote Sensing |
description |
When observed from the ground, optically thick clouds minimally polarize light, while the linear polarization direction (angle) of optically thin clouds contains information about thermodynamic phase. For instruments such at the Cimel radiometers that comprise the AErosol RObotic NEtwork (AERONET), these properties can also be exploited to aid cloud optical property retrievals. Using vector radiative transfer simulations, we explore the conditions most favorable to cloud thermodynamic phase determination, then test with actual AERONET data. Results indicate that this technique may be appropriate for some, but not all, conditions, and motivate a deeper investigation about the polarization direction measurement capability of Cimel instruments, which to date have been primarily used to determine degree of polarization. Recent work explores these measurement issues using a newly installed instrument at the NASA Ames Research Center in Moffett Field, California. |
format |
Other/Unknown Material |
author |
Dunagan, Stephen Marshak, Alexander Slutsker, Ilya van Diedenhoven, Bastiaan Holben, Brent Knobelspiesse, Kirk |
author_facet |
Dunagan, Stephen Marshak, Alexander Slutsker, Ilya van Diedenhoven, Bastiaan Holben, Brent Knobelspiesse, Kirk |
author_sort |
Dunagan, Stephen |
title |
A42A-04: Determination of Cloud Thermodynamic Phase with Ground Based, Polarimetrically Sensitive, Passive Sky Radiometers |
title_short |
A42A-04: Determination of Cloud Thermodynamic Phase with Ground Based, Polarimetrically Sensitive, Passive Sky Radiometers |
title_full |
A42A-04: Determination of Cloud Thermodynamic Phase with Ground Based, Polarimetrically Sensitive, Passive Sky Radiometers |
title_fullStr |
A42A-04: Determination of Cloud Thermodynamic Phase with Ground Based, Polarimetrically Sensitive, Passive Sky Radiometers |
title_full_unstemmed |
A42A-04: Determination of Cloud Thermodynamic Phase with Ground Based, Polarimetrically Sensitive, Passive Sky Radiometers |
title_sort |
a42a-04: determination of cloud thermodynamic phase with ground based, polarimetrically sensitive, passive sky radiometers |
publishDate |
2015 |
url |
http://hdl.handle.net/2060/20190001354 |
op_coverage |
Unclassified, Unlimited, Publicly available |
genre |
Aerosol Robotic Network |
genre_facet |
Aerosol Robotic Network |
op_source |
CASI |
op_relation |
Document ID: 20190001354 http://hdl.handle.net/2060/20190001354 |
op_rights |
Copyright, Public use permitted |
_version_ |
1766400700789555200 |