Novel aerosol extinction coefficients and lidar ratios over the ocean from CALIPSO–CloudSat: evaluation and global statistics
Aerosol extinction coefficients ( σ a ) and lidar ratios (LRs) are retrieved over the ocean from CALIPSO's Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) attenuated backscatter profiles by solving the lidar equation constrained with aerosol optical depths (AODs) derived by applying t...
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ftdoajarticles:oai:doaj.org/article:fd3a8ae7317646e4bef0960e08c6c86c 2023-05-15T17:45:45+02:00 Novel aerosol extinction coefficients and lidar ratios over the ocean from CALIPSO–CloudSat: evaluation and global statistics D. Painemal M. Clayton R. Ferrare S. Burton D. Josset M. Vaughan 2019-04-01T00:00:00Z https://doi.org/10.5194/amt-12-2201-2019 https://doaj.org/article/fd3a8ae7317646e4bef0960e08c6c86c EN eng Copernicus Publications https://www.atmos-meas-tech.net/12/2201/2019/amt-12-2201-2019.pdf https://doaj.org/toc/1867-1381 https://doaj.org/toc/1867-8548 doi:10.5194/amt-12-2201-2019 1867-1381 1867-8548 https://doaj.org/article/fd3a8ae7317646e4bef0960e08c6c86c Atmospheric Measurement Techniques, Vol 12, Pp 2201-2217 (2019) Environmental engineering TA170-171 Earthwork. Foundations TA715-787 article 2019 ftdoajarticles https://doi.org/10.5194/amt-12-2201-2019 2022-12-30T21:26:51Z Aerosol extinction coefficients ( σ a ) and lidar ratios (LRs) are retrieved over the ocean from CALIPSO's Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) attenuated backscatter profiles by solving the lidar equation constrained with aerosol optical depths (AODs) derived by applying the Synergized Optical Depth of Aerosols (SODA) algorithm to ocean surface returns measured by CALIOP and CloudSat's Cloud Profiling Radar. σ a and LR are retrieved for two independent scenarios that require somewhat different assumptions: (a) a single homogeneous atmospheric layer (1L) for which the LR is constant with height and (b) a vertically homogeneous layer with a constant LR overlying a marine boundary layer with a homogenous LR fixed at 25 sr (two-layer method, 2L). These new retrievals differ from the standard CALIPSO version 4.1 (V4) product, as the CALIOP–SODA method does not rely on an aerosol classification scheme to select LR. CALIOP–SODA σ a and LR are evaluated using airborne high-spectral-resolution lidar (HSRL) observations over the northwest Atlantic. CALIOP–SODA LR (1L and 2L) positively correlates with its HSRL counterpart (linear correlation coefficient r >0.67 ), with a negative bias smaller than 17.4 % and a good agreement for σ a ( r ≥ 0.78) with a small negative bias ( <math xmlns="http://www.w3.org/1998/Math/MathML" id="M7" display="inline" overflow="scroll" dspmath="mathml"><mrow><mo>≤</mo><mo>|</mo><mo>-</mo><mn mathvariant="normal">9.2</mn><mspace linebreak="nobreak" width="0.125em"/><mi mathvariant="italic">%</mi><mo>|</mo></mrow></math> <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="57pt" height="13pt" class="svg-formula" dspmath="mathimg" md5hash="f67eeff144e6281595dbea33f3f700d0"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="amt-12-2201-2019-ie00001.svg" width="57pt" height="13pt" src="amt-12-2201-2019-ie00001.png"/></svg:svg> ). ... Article in Journal/Newspaper Northwest Atlantic Directory of Open Access Journals: DOAJ Articles Atmospheric Measurement Techniques 12 4 2201 2217 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental engineering TA170-171 Earthwork. Foundations TA715-787 |
spellingShingle |
Environmental engineering TA170-171 Earthwork. Foundations TA715-787 D. Painemal M. Clayton R. Ferrare S. Burton D. Josset M. Vaughan Novel aerosol extinction coefficients and lidar ratios over the ocean from CALIPSO–CloudSat: evaluation and global statistics |
topic_facet |
Environmental engineering TA170-171 Earthwork. Foundations TA715-787 |
description |
Aerosol extinction coefficients ( σ a ) and lidar ratios (LRs) are retrieved over the ocean from CALIPSO's Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) attenuated backscatter profiles by solving the lidar equation constrained with aerosol optical depths (AODs) derived by applying the Synergized Optical Depth of Aerosols (SODA) algorithm to ocean surface returns measured by CALIOP and CloudSat's Cloud Profiling Radar. σ a and LR are retrieved for two independent scenarios that require somewhat different assumptions: (a) a single homogeneous atmospheric layer (1L) for which the LR is constant with height and (b) a vertically homogeneous layer with a constant LR overlying a marine boundary layer with a homogenous LR fixed at 25 sr (two-layer method, 2L). These new retrievals differ from the standard CALIPSO version 4.1 (V4) product, as the CALIOP–SODA method does not rely on an aerosol classification scheme to select LR. CALIOP–SODA σ a and LR are evaluated using airborne high-spectral-resolution lidar (HSRL) observations over the northwest Atlantic. CALIOP–SODA LR (1L and 2L) positively correlates with its HSRL counterpart (linear correlation coefficient r >0.67 ), with a negative bias smaller than 17.4 % and a good agreement for σ a ( r ≥ 0.78) with a small negative bias ( <math xmlns="http://www.w3.org/1998/Math/MathML" id="M7" display="inline" overflow="scroll" dspmath="mathml"><mrow><mo>≤</mo><mo>|</mo><mo>-</mo><mn mathvariant="normal">9.2</mn><mspace linebreak="nobreak" width="0.125em"/><mi mathvariant="italic">%</mi><mo>|</mo></mrow></math> <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="57pt" height="13pt" class="svg-formula" dspmath="mathimg" md5hash="f67eeff144e6281595dbea33f3f700d0"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="amt-12-2201-2019-ie00001.svg" width="57pt" height="13pt" src="amt-12-2201-2019-ie00001.png"/></svg:svg> ). ... |
format |
Article in Journal/Newspaper |
author |
D. Painemal M. Clayton R. Ferrare S. Burton D. Josset M. Vaughan |
author_facet |
D. Painemal M. Clayton R. Ferrare S. Burton D. Josset M. Vaughan |
author_sort |
D. Painemal |
title |
Novel aerosol extinction coefficients and lidar ratios over the ocean from CALIPSO–CloudSat: evaluation and global statistics |
title_short |
Novel aerosol extinction coefficients and lidar ratios over the ocean from CALIPSO–CloudSat: evaluation and global statistics |
title_full |
Novel aerosol extinction coefficients and lidar ratios over the ocean from CALIPSO–CloudSat: evaluation and global statistics |
title_fullStr |
Novel aerosol extinction coefficients and lidar ratios over the ocean from CALIPSO–CloudSat: evaluation and global statistics |
title_full_unstemmed |
Novel aerosol extinction coefficients and lidar ratios over the ocean from CALIPSO–CloudSat: evaluation and global statistics |
title_sort |
novel aerosol extinction coefficients and lidar ratios over the ocean from calipso–cloudsat: evaluation and global statistics |
publisher |
Copernicus Publications |
publishDate |
2019 |
url |
https://doi.org/10.5194/amt-12-2201-2019 https://doaj.org/article/fd3a8ae7317646e4bef0960e08c6c86c |
genre |
Northwest Atlantic |
genre_facet |
Northwest Atlantic |
op_source |
Atmospheric Measurement Techniques, Vol 12, Pp 2201-2217 (2019) |
op_relation |
https://www.atmos-meas-tech.net/12/2201/2019/amt-12-2201-2019.pdf https://doaj.org/toc/1867-1381 https://doaj.org/toc/1867-8548 doi:10.5194/amt-12-2201-2019 1867-1381 1867-8548 https://doaj.org/article/fd3a8ae7317646e4bef0960e08c6c86c |
op_doi |
https://doi.org/10.5194/amt-12-2201-2019 |
container_title |
Atmospheric Measurement Techniques |
container_volume |
12 |
container_issue |
4 |
container_start_page |
2201 |
op_container_end_page |
2217 |
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1766148983441326080 |