CALIOP and AERONET Aerosol Optical Depth Comparisons: One Size Fits None
We compare the aerosol optical depths (AOD) retrieved from backscatter measurements of the Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) aboard the Cloud Aerosol Lidar Infrared Pathfinder Satellite Observations (CALIPSO) satellite with coincident Aerosol Robotic Network (AERONET) measure...
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ftnasantrs:oai:casi.ntrs.nasa.gov:20140012767 2023-05-15T13:06:21+02:00 CALIOP and AERONET Aerosol Optical Depth Comparisons: One Size Fits None Vaughan, M. A. Liu, Z. Omar, A. H. Kar, J. Giles, D. M. Winker, D. M. Tackett, J. L. Powell, K. A. Trepte, C. R. Unclassified, Unlimited, Publicly available May 19, 2014 application/pdf http://hdl.handle.net/2060/20140012767 unknown Document ID: 20140012767 http://hdl.handle.net/2060/20140012767 Copyright, Distribution as joint owner in the copyright CASI Geophysics NF1676L-14895 Journal of Geophysical Research: Atmospheres Volume 118; 4748-4766 2014 ftnasantrs 2015-03-14T23:48:44Z We compare the aerosol optical depths (AOD) retrieved from backscatter measurements of the Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) aboard the Cloud Aerosol Lidar Infrared Pathfinder Satellite Observations (CALIPSO) satellite with coincident Aerosol Robotic Network (AERONET) measurements. Overpass coincidence criteria of +/- 2 h and within a 40 km radius are satisfied at least once at 149 globally distributed AERONET sites from 2006 to 2010. Most data pairs (>80%) use AERONET measurements acquired +/- 30 min of the overpass. We examine the differences in AOD estimates between CALIOP and AERONET for various aerosol, environmental, and geographic conditions. Results show CALIOP AOD are lower than AERONET AOD especially at low optical depths as measured by AERONET (500 nm AOD<0.1). Furthermore, the median relative AOD difference between the two measurements is 25% of the AERONET AOD for AOD>0.1. Differences in AOD between CALIOP and AERONET are possibly due to cloud contamination, scene inhomogeneity, instrument view angle differences, CALIOP retrieval errors, and detection limits. Comparison of daytime to nighttime number of 5 km 60m (60m in the vertical) features detected by CALIOP show that there are 20% more aerosol features at night. We find that CALIPSO and AERONET do not agree on the cloudiness of scenes. Of the scenes that meet the above coincidence criteria, CALIPSO finds clouds in more than 45% of the coincident atmospheric columns AERONET classifies as clear. 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 |
Geophysics |
spellingShingle |
Geophysics Vaughan, M. A. Liu, Z. Omar, A. H. Kar, J. Giles, D. M. Winker, D. M. Tackett, J. L. Powell, K. A. Trepte, C. R. CALIOP and AERONET Aerosol Optical Depth Comparisons: One Size Fits None |
topic_facet |
Geophysics |
description |
We compare the aerosol optical depths (AOD) retrieved from backscatter measurements of the Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) aboard the Cloud Aerosol Lidar Infrared Pathfinder Satellite Observations (CALIPSO) satellite with coincident Aerosol Robotic Network (AERONET) measurements. Overpass coincidence criteria of +/- 2 h and within a 40 km radius are satisfied at least once at 149 globally distributed AERONET sites from 2006 to 2010. Most data pairs (>80%) use AERONET measurements acquired +/- 30 min of the overpass. We examine the differences in AOD estimates between CALIOP and AERONET for various aerosol, environmental, and geographic conditions. Results show CALIOP AOD are lower than AERONET AOD especially at low optical depths as measured by AERONET (500 nm AOD<0.1). Furthermore, the median relative AOD difference between the two measurements is 25% of the AERONET AOD for AOD>0.1. Differences in AOD between CALIOP and AERONET are possibly due to cloud contamination, scene inhomogeneity, instrument view angle differences, CALIOP retrieval errors, and detection limits. Comparison of daytime to nighttime number of 5 km 60m (60m in the vertical) features detected by CALIOP show that there are 20% more aerosol features at night. We find that CALIPSO and AERONET do not agree on the cloudiness of scenes. Of the scenes that meet the above coincidence criteria, CALIPSO finds clouds in more than 45% of the coincident atmospheric columns AERONET classifies as clear. |
format |
Other/Unknown Material |
author |
Vaughan, M. A. Liu, Z. Omar, A. H. Kar, J. Giles, D. M. Winker, D. M. Tackett, J. L. Powell, K. A. Trepte, C. R. |
author_facet |
Vaughan, M. A. Liu, Z. Omar, A. H. Kar, J. Giles, D. M. Winker, D. M. Tackett, J. L. Powell, K. A. Trepte, C. R. |
author_sort |
Vaughan, M. A. |
title |
CALIOP and AERONET Aerosol Optical Depth Comparisons: One Size Fits None |
title_short |
CALIOP and AERONET Aerosol Optical Depth Comparisons: One Size Fits None |
title_full |
CALIOP and AERONET Aerosol Optical Depth Comparisons: One Size Fits None |
title_fullStr |
CALIOP and AERONET Aerosol Optical Depth Comparisons: One Size Fits None |
title_full_unstemmed |
CALIOP and AERONET Aerosol Optical Depth Comparisons: One Size Fits None |
title_sort |
caliop and aeronet aerosol optical depth comparisons: one size fits none |
publishDate |
2014 |
url |
http://hdl.handle.net/2060/20140012767 |
op_coverage |
Unclassified, Unlimited, Publicly available |
genre |
Aerosol Robotic Network |
genre_facet |
Aerosol Robotic Network |
op_source |
CASI |
op_relation |
Document ID: 20140012767 http://hdl.handle.net/2060/20140012767 |
op_rights |
Copyright, Distribution as joint owner in the copyright |
_version_ |
1766002110625742848 |