Assessment of tropospheric CALIPSO Version 4.2 aerosol types over the ocean using independent CALIPSO–SODA lidar ratios
<p>We assess the CALIPSO Version 4.2 (V4) aerosol typing and assigned lidar ratios over ocean using aerosol optical depth (AOD) retrievals from the Synergized Optical Depth of Aerosols (SODA) algorithm and retrieved columnar lidar ratio estimated by combining SODA AOD and CALIPSO attenuated ba...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2022-05-01
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| Series: | Atmospheric Measurement Techniques |
| Online Access: | https://amt.copernicus.org/articles/15/2745/2022/amt-15-2745-2022.pdf |
| _version_ | 1818028504906727424 |
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| author | Z. Li Z. Li D. Painemal D. Painemal G. Schuster M. Clayton M. Clayton R. Ferrare M. Vaughan D. Josset J. Kar J. Kar C. Trepte |
| author_facet | Z. Li Z. Li D. Painemal D. Painemal G. Schuster M. Clayton M. Clayton R. Ferrare M. Vaughan D. Josset J. Kar J. Kar C. Trepte |
| author_sort | Z. Li |
| collection | DOAJ |
| description | <p>We assess the CALIPSO Version 4.2 (V4) aerosol typing and assigned lidar ratios over ocean using aerosol optical depth (AOD) retrievals from the Synergized Optical Depth of Aerosols (SODA) algorithm and retrieved columnar lidar ratio estimated by combining SODA AOD and CALIPSO attenuated backscatter (CALIPSO–SODA). Six aerosol types – clean marine, dusty marine,
dust, polluted continental/smoke, polluted dust, and elevated smoke – are
characterized using CALIPSO–SODA over ocean and the results are compared
against the prescribed V4 lidar ratios, when only one aerosol type is
present in the atmospheric column. For samples detected at 5 or 20 km
spatial resolutions and having AOD <span class="inline-formula">></span> 0.05, the CALIPSO–SODA lidar
ratios are significantly different between different aerosol types, and are
consistent with the type-specific values assigned in V4 to within 10 sr
(except for polluted continental/smoke). This implies that the CALIPSO
classification scheme generally categorizes specific aerosols types
correctly over regions where they are abundant. We find remarkable
daytime/nighttime regional agreement for clean marine aerosol over the open
ocean (CALIPSO–SODA <span class="inline-formula">=</span> 20–25 sr, V4 <span class="inline-formula">=</span> 23 sr), elevated smoke over the southeast Atlantic (CALIPSO–SODA <span class="inline-formula">=</span> 65–75 sr, V4 <span class="inline-formula">=</span> 70 sr), and dust over the subtropical Atlantic adjacent to the African continent (CALIPSO–SODA <span class="inline-formula">=</span> 40–50 sr, V4 <span class="inline-formula">=</span> 44 sr). In contrast, daytime polluted continental/smoke lidar
ratio is more than 20 sr smaller than the constant V4 value for that type,
attributed in part to the challenge of classifying tenuous aerosol with low
signal-to-noise ratio. Dust over most of the Atlantic Ocean features
CALIPSO–SODA lidar ratios less than 40 sr, possibly suggesting the presence of dust mixed with marine aerosols or lidar ratio values that depend on source and evolution of the aerosol plume. The new dusty marine type introduced in V4 features similar magnitudes and spatial distribution as its clean marine counterpart with lidar ratio differences of less than 3 sr, and nearly identical values over the open ocean, implying that some modification of the classification scheme for the marine subtypes is warranted.</p> |
| first_indexed | 2024-12-10T05:04:51Z |
| format | Article |
| id | doaj.art-3c0d58b0e4164e88b17e6f97c252c46e |
| institution | Directory Open Access Journal |
| issn | 1867-1381 1867-8548 |
| language | English |
| last_indexed | 2024-12-10T05:04:51Z |
| publishDate | 2022-05-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Measurement Techniques |
| spelling | doaj.art-3c0d58b0e4164e88b17e6f97c252c46e2022-12-22T02:01:17ZengCopernicus PublicationsAtmospheric Measurement Techniques1867-13811867-85482022-05-01152745276610.5194/amt-15-2745-2022Assessment of tropospheric CALIPSO Version 4.2 aerosol types over the ocean using independent CALIPSO–SODA lidar ratiosZ. Li0Z. Li1D. Painemal2D. Painemal3G. Schuster4M. Clayton5M. Clayton6R. Ferrare7M. Vaughan8D. Josset9J. Kar10J. Kar11C. Trepte12Science Systems and Applications Systems, Inc., Hampton, VA 23666, USANASA Langley Research Center, Hampton, VA 23681, USAScience Systems and Applications Systems, Inc., Hampton, VA 23666, USANASA Langley Research Center, Hampton, VA 23681, USANASA Langley Research Center, Hampton, VA 23681, USAScience Systems and Applications Systems, Inc., Hampton, VA 23666, USANASA Langley Research Center, Hampton, VA 23681, USANASA Langley Research Center, Hampton, VA 23681, USANASA Langley Research Center, Hampton, VA 23681, USAU.S. Naval Research Laboratory, Stennis Space Center, MS, 39529, USAScience Systems and Applications Systems, Inc., Hampton, VA 23666, USANASA Langley Research Center, Hampton, VA 23681, USANASA Langley Research Center, Hampton, VA 23681, USA<p>We assess the CALIPSO Version 4.2 (V4) aerosol typing and assigned lidar ratios over ocean using aerosol optical depth (AOD) retrievals from the Synergized Optical Depth of Aerosols (SODA) algorithm and retrieved columnar lidar ratio estimated by combining SODA AOD and CALIPSO attenuated backscatter (CALIPSO–SODA). Six aerosol types – clean marine, dusty marine, dust, polluted continental/smoke, polluted dust, and elevated smoke – are characterized using CALIPSO–SODA over ocean and the results are compared against the prescribed V4 lidar ratios, when only one aerosol type is present in the atmospheric column. For samples detected at 5 or 20 km spatial resolutions and having AOD <span class="inline-formula">></span> 0.05, the CALIPSO–SODA lidar ratios are significantly different between different aerosol types, and are consistent with the type-specific values assigned in V4 to within 10 sr (except for polluted continental/smoke). This implies that the CALIPSO classification scheme generally categorizes specific aerosols types correctly over regions where they are abundant. We find remarkable daytime/nighttime regional agreement for clean marine aerosol over the open ocean (CALIPSO–SODA <span class="inline-formula">=</span> 20–25 sr, V4 <span class="inline-formula">=</span> 23 sr), elevated smoke over the southeast Atlantic (CALIPSO–SODA <span class="inline-formula">=</span> 65–75 sr, V4 <span class="inline-formula">=</span> 70 sr), and dust over the subtropical Atlantic adjacent to the African continent (CALIPSO–SODA <span class="inline-formula">=</span> 40–50 sr, V4 <span class="inline-formula">=</span> 44 sr). In contrast, daytime polluted continental/smoke lidar ratio is more than 20 sr smaller than the constant V4 value for that type, attributed in part to the challenge of classifying tenuous aerosol with low signal-to-noise ratio. Dust over most of the Atlantic Ocean features CALIPSO–SODA lidar ratios less than 40 sr, possibly suggesting the presence of dust mixed with marine aerosols or lidar ratio values that depend on source and evolution of the aerosol plume. The new dusty marine type introduced in V4 features similar magnitudes and spatial distribution as its clean marine counterpart with lidar ratio differences of less than 3 sr, and nearly identical values over the open ocean, implying that some modification of the classification scheme for the marine subtypes is warranted.</p>https://amt.copernicus.org/articles/15/2745/2022/amt-15-2745-2022.pdf |
| spellingShingle | Z. Li Z. Li D. Painemal D. Painemal G. Schuster M. Clayton M. Clayton R. Ferrare M. Vaughan D. Josset J. Kar J. Kar C. Trepte Assessment of tropospheric CALIPSO Version 4.2 aerosol types over the ocean using independent CALIPSO–SODA lidar ratios Atmospheric Measurement Techniques |
| title | Assessment of tropospheric CALIPSO Version 4.2 aerosol types over the ocean using independent CALIPSO–SODA lidar ratios |
| title_full | Assessment of tropospheric CALIPSO Version 4.2 aerosol types over the ocean using independent CALIPSO–SODA lidar ratios |
| title_fullStr | Assessment of tropospheric CALIPSO Version 4.2 aerosol types over the ocean using independent CALIPSO–SODA lidar ratios |
| title_full_unstemmed | Assessment of tropospheric CALIPSO Version 4.2 aerosol types over the ocean using independent CALIPSO–SODA lidar ratios |
| title_short | Assessment of tropospheric CALIPSO Version 4.2 aerosol types over the ocean using independent CALIPSO–SODA lidar ratios |
| title_sort | assessment of tropospheric calipso version 4 2 aerosol types over the ocean using independent calipso soda lidar ratios |
| url | https://amt.copernicus.org/articles/15/2745/2022/amt-15-2745-2022.pdf |
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