CALIPSO observations of near-cloud aerosol properties as a function of cloud fraction
This paper uses spaceborne lidar data to study how near‐cloud aerosol statistics of attenuated backscatter depend on cloud fraction. The results for a large region around the Azores show that (1) far‐from‐cloud aerosol statistics are dominated by samples from scenes with lower cloud fractions, while...
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| Veröffentlicht in: | Geophysical research letters 2014-12, Vol.41 (24), p.9150-9157 |
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| creator | Yang, Weidong Marshak, Alexander Várnai, Tamás Wood, Robert |
| description | This paper uses spaceborne lidar data to study how near‐cloud aerosol statistics of attenuated backscatter depend on cloud fraction. The results for a large region around the Azores show that (1) far‐from‐cloud aerosol statistics are dominated by samples from scenes with lower cloud fractions, while near‐cloud aerosol statistics are dominated by samples from scenes with higher cloud fractions; (2) near‐cloud enhancements of attenuated backscatter occur for any cloud fraction but are most pronounced for higher cloud fractions; (3) the difference in the enhancements for different cloud fractions is most significant within 5 km from clouds; (4) near‐cloud enhancements can be well approximated by logarithmic functions of cloud fraction and distance to clouds. These findings demonstrate that if variability in cloud fraction across the scenes used for composite aerosol statistics is not considered, a sampling artifact will affect these statistics calculated as a function of distance to clouds. For the Azores region data set examined here, this artifact occurs mostly within 5 km from clouds and exaggerates the near‐cloud enhancements of lidar backscatter and color ratio by about 30%. This shows that for accurate characterization of the changes in aerosol properties with distance to clouds, it is important to account for the impact of changes in cloud fraction.
Key Points
Near‐cloud aerosols around the Azores are studied using CALIPSO lidar dataData show that cloud fraction affects apparent aerosol enhancement near cloudsCloud fraction variations inflate near‐cloud changes in composite statistics |
| doi_str_mv | 10.1002/2014GL061896 |
| format | Article |
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Key Points
Near‐cloud aerosols around the Azores are studied using CALIPSO lidar dataData show that cloud fraction affects apparent aerosol enhancement near cloudsCloud fraction variations inflate near‐cloud changes in composite statistics</description><identifier>ISSN: 0094-8276</identifier><identifier>EISSN: 1944-8007</identifier><identifier>DOI: 10.1002/2014GL061896</identifier><language>eng</language><publisher>Washington: Blackwell Publishing Ltd</publisher><subject>aerosol ; Aerosol properties ; Aerosols ; Approximation ; Attenuation ; Azores ; Backscatter ; Backscattering ; CALIPSO ; cloud ; cloud fraction ; Clouds ; Color ; Colour ; Distance ; Fractions ; Lidar ; Lidar backscatter ; Mathematical analysis ; Meteorological satellites ; Properties ; Samples ; Sampling ; Spaceborne lidar ; Statistical analysis ; Statistical methods ; Statistics ; transition zone ; Turbulence models ; Variability</subject><ispartof>Geophysical research letters, 2014-12, Vol.41 (24), p.9150-9157</ispartof><rights>2014. American Geophysical Union. All Rights Reserved.</rights><rights>2015. American Geophysical Union. All Rights Reserved.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c5199-fd364ea7759c6a94c5c1f003cc284f38f96e56a667ecd6eaae6e4289750bdcc83</citedby><cites>FETCH-LOGICAL-c5199-fd364ea7759c6a94c5c1f003cc284f38f96e56a667ecd6eaae6e4289750bdcc83</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1002%2F2014GL061896$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1002%2F2014GL061896$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,780,784,1417,1433,11514,27924,27925,45574,45575,46409,46468,46833,46892</link.rule.ids></links><search><creatorcontrib>Yang, Weidong</creatorcontrib><creatorcontrib>Marshak, Alexander</creatorcontrib><creatorcontrib>Várnai, Tamás</creatorcontrib><creatorcontrib>Wood, Robert</creatorcontrib><title>CALIPSO observations of near-cloud aerosol properties as a function of cloud fraction</title><title>Geophysical research letters</title><addtitle>Geophys. Res. Lett</addtitle><description>This paper uses spaceborne lidar data to study how near‐cloud aerosol statistics of attenuated backscatter depend on cloud fraction. The results for a large region around the Azores show that (1) far‐from‐cloud aerosol statistics are dominated by samples from scenes with lower cloud fractions, while near‐cloud aerosol statistics are dominated by samples from scenes with higher cloud fractions; (2) near‐cloud enhancements of attenuated backscatter occur for any cloud fraction but are most pronounced for higher cloud fractions; (3) the difference in the enhancements for different cloud fractions is most significant within 5 km from clouds; (4) near‐cloud enhancements can be well approximated by logarithmic functions of cloud fraction and distance to clouds. These findings demonstrate that if variability in cloud fraction across the scenes used for composite aerosol statistics is not considered, a sampling artifact will affect these statistics calculated as a function of distance to clouds. For the Azores region data set examined here, this artifact occurs mostly within 5 km from clouds and exaggerates the near‐cloud enhancements of lidar backscatter and color ratio by about 30%. This shows that for accurate characterization of the changes in aerosol properties with distance to clouds, it is important to account for the impact of changes in cloud fraction.
Key Points
Near‐cloud aerosols around the Azores are studied using CALIPSO lidar dataData show that cloud fraction affects apparent aerosol enhancement near cloudsCloud fraction variations inflate near‐cloud changes in composite statistics</description><subject>aerosol</subject><subject>Aerosol properties</subject><subject>Aerosols</subject><subject>Approximation</subject><subject>Attenuation</subject><subject>Azores</subject><subject>Backscatter</subject><subject>Backscattering</subject><subject>CALIPSO</subject><subject>cloud</subject><subject>cloud fraction</subject><subject>Clouds</subject><subject>Color</subject><subject>Colour</subject><subject>Distance</subject><subject>Fractions</subject><subject>Lidar</subject><subject>Lidar backscatter</subject><subject>Mathematical analysis</subject><subject>Meteorological satellites</subject><subject>Properties</subject><subject>Samples</subject><subject>Sampling</subject><subject>Spaceborne lidar</subject><subject>Statistical analysis</subject><subject>Statistical methods</subject><subject>Statistics</subject><subject>transition zone</subject><subject>Turbulence models</subject><subject>Variability</subject><issn>0094-8276</issn><issn>1944-8007</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2014</creationdate><recordtype>article</recordtype><recordid>eNqNkclKBDEQhoMoOI7efIAGLx5szdZZjiI6LuOCCx5DzFSgte2MybQ6b2_GFhEPIhSkCN9f9VcVQpsE7xKM6R7FhI_GWBClxRIaEM15qTCWy2iAsc45lWIVraX0iDFmmJEBujvYH59c3VwW4SFBfLWzOrSpCL5owcbSNaGbFBZiSKEppjFMIc5qSIXNUfiudQt-gfekj_bzZx2teNsk2Ph6h-ju6PD24LgcX45OcsfSVUTr0k-Y4GClrLQTVnNXOeKzM-eo4p4prwVUwgohwU0EWAsCOFVaVvhh4pxiQ7Td183WXjpIM_NcJwdNY1sIXTJEakazQv0HlUxRzQjP6NYv9DF0sc2DGKIJ1nmXFf2TElwxwrhY1NrpKZd3mCJ4M431s41zQ7BZHM38PFrGaY-_1Q3M_2TN6HqcbeQJh6jsRXWawfu3yMYnIySTlbm_GJn72_PTY6HPjGAfyrCk5Q</recordid><startdate>20141228</startdate><enddate>20141228</enddate><creator>Yang, Weidong</creator><creator>Marshak, Alexander</creator><creator>Várnai, Tamás</creator><creator>Wood, Robert</creator><general>Blackwell Publishing Ltd</general><general>John Wiley & Sons, Inc</general><scope>BSCLL</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>7TN</scope><scope>8FD</scope><scope>F1W</scope><scope>FR3</scope><scope>H8D</scope><scope>H96</scope><scope>KL.</scope><scope>KR7</scope><scope>L.G</scope><scope>L7M</scope><scope>7UA</scope><scope>C1K</scope></search><sort><creationdate>20141228</creationdate><title>CALIPSO observations of near-cloud aerosol properties as a function of cloud fraction</title><author>Yang, Weidong ; Marshak, Alexander ; Várnai, Tamás ; Wood, Robert</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c5199-fd364ea7759c6a94c5c1f003cc284f38f96e56a667ecd6eaae6e4289750bdcc83</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2014</creationdate><topic>aerosol</topic><topic>Aerosol properties</topic><topic>Aerosols</topic><topic>Approximation</topic><topic>Attenuation</topic><topic>Azores</topic><topic>Backscatter</topic><topic>Backscattering</topic><topic>CALIPSO</topic><topic>cloud</topic><topic>cloud fraction</topic><topic>Clouds</topic><topic>Color</topic><topic>Colour</topic><topic>Distance</topic><topic>Fractions</topic><topic>Lidar</topic><topic>Lidar backscatter</topic><topic>Mathematical analysis</topic><topic>Meteorological satellites</topic><topic>Properties</topic><topic>Samples</topic><topic>Sampling</topic><topic>Spaceborne lidar</topic><topic>Statistical analysis</topic><topic>Statistical methods</topic><topic>Statistics</topic><topic>transition zone</topic><topic>Turbulence models</topic><topic>Variability</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Yang, Weidong</creatorcontrib><creatorcontrib>Marshak, Alexander</creatorcontrib><creatorcontrib>Várnai, Tamás</creatorcontrib><creatorcontrib>Wood, Robert</creatorcontrib><collection>Istex</collection><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Oceanic Abstracts</collection><collection>Technology Research Database</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Engineering Research Database</collection><collection>Aerospace Database</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Civil Engineering Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Water Resources Abstracts</collection><collection>Environmental Sciences and Pollution Management</collection><jtitle>Geophysical research letters</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Yang, Weidong</au><au>Marshak, Alexander</au><au>Várnai, Tamás</au><au>Wood, Robert</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>CALIPSO observations of near-cloud aerosol properties as a function of cloud fraction</atitle><jtitle>Geophysical research letters</jtitle><addtitle>Geophys. Res. Lett</addtitle><date>2014-12-28</date><risdate>2014</risdate><volume>41</volume><issue>24</issue><spage>9150</spage><epage>9157</epage><pages>9150-9157</pages><issn>0094-8276</issn><eissn>1944-8007</eissn><abstract>This paper uses spaceborne lidar data to study how near‐cloud aerosol statistics of attenuated backscatter depend on cloud fraction. The results for a large region around the Azores show that (1) far‐from‐cloud aerosol statistics are dominated by samples from scenes with lower cloud fractions, while near‐cloud aerosol statistics are dominated by samples from scenes with higher cloud fractions; (2) near‐cloud enhancements of attenuated backscatter occur for any cloud fraction but are most pronounced for higher cloud fractions; (3) the difference in the enhancements for different cloud fractions is most significant within 5 km from clouds; (4) near‐cloud enhancements can be well approximated by logarithmic functions of cloud fraction and distance to clouds. These findings demonstrate that if variability in cloud fraction across the scenes used for composite aerosol statistics is not considered, a sampling artifact will affect these statistics calculated as a function of distance to clouds. For the Azores region data set examined here, this artifact occurs mostly within 5 km from clouds and exaggerates the near‐cloud enhancements of lidar backscatter and color ratio by about 30%. This shows that for accurate characterization of the changes in aerosol properties with distance to clouds, it is important to account for the impact of changes in cloud fraction.
Key Points
Near‐cloud aerosols around the Azores are studied using CALIPSO lidar dataData show that cloud fraction affects apparent aerosol enhancement near cloudsCloud fraction variations inflate near‐cloud changes in composite statistics</abstract><cop>Washington</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1002/2014GL061896</doi><tpages>8</tpages><oa>free_for_read</oa></addata></record> |
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| subjects | aerosol Aerosol properties Aerosols Approximation Attenuation Azores Backscatter Backscattering CALIPSO cloud cloud fraction Clouds Color Colour Distance Fractions Lidar Lidar backscatter Mathematical analysis Meteorological satellites Properties Samples Sampling Spaceborne lidar Statistical analysis Statistical methods Statistics transition zone Turbulence models Variability |
| title | CALIPSO observations of near-cloud aerosol properties as a function of cloud fraction |
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