Comparison of Moderate Resolution Imaging Spectroradiometer ocean aerosol retrievals with ship-based Sun photometer measurements from the Around the Americas expedition
The Around the Americas expedition was a 25,000 mile sailing circumnavigation of the North and South American continents, in coastal waters, that took place from June 2009 to June 2010. The broad geographical span of the voyage made it possible to measure marine aerosol optical depths in regions whe...
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| Veröffentlicht in: | Journal of Geophysical Research 2011-08, Vol.116 (D16), p.n/a, Article D16303 |
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| creator | Adames, A. F. Reynolds, M. Smirnov, A. Covert, D. S. Ackerman, T. P. |
| description | The Around the Americas expedition was a 25,000 mile sailing circumnavigation of the North and South American continents, in coastal waters, that took place from June 2009 to June 2010. The broad geographical span of the voyage made it possible to measure marine aerosol optical depths in regions where surface measurements are not frequently taken. These were measured with a handheld Microtops II Sun photometer. In this study we compare these measurements with the ocean aerosol product from the Moderate Resolution Imaging Spectroradiometer (MODIS) aboard the Aqua and Terra platforms. Results for aerosol optical depth (AOD) show a strong relationship between both measurements, with most values from MODIS falling within published expectations. However, MODIS values are biased high relative to surface observations for small optical depth values. There appears to be a relationship between these discrepancies in measurements and surface wind speed, with a group of values showing overestimation at wind speeds near and over 6 m/s and a second, smaller group showing underestimation for calmer conditions. For derived Ångström exponents, it is found that higher differences occur at low AOD. No relationship between these differences and wind speed is found.
Key Points
Low AOD values for MODIS are biased high when compared to Microtops
Bias is attributable to surface wind speeds
No trends are observed for Ångström exponent |
| doi_str_mv | 10.1029/2010JD015440 |
| format | Article |
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Key Points
Low AOD values for MODIS are biased high when compared to Microtops
Bias is attributable to surface wind speeds
No trends are observed for Ångström exponent</description><identifier>ISSN: 0148-0227</identifier><identifier>ISSN: 2169-897X</identifier><identifier>EISSN: 2156-2202</identifier><identifier>EISSN: 2169-8996</identifier><identifier>DOI: 10.1029/2010JD015440</identifier><language>eng</language><publisher>Washington, DC: Blackwell Publishing Ltd</publisher><subject>aerosol optical depth ; Aerosols ; Atmospheric aerosols ; Atmospheric sciences ; bias ; Coastal waters ; Earth sciences ; Earth, ocean, space ; Exact sciences and technology ; Geophysics ; Microtops ; MODIS ; ocean ; Optical analysis ; Photometers ; Radiation ; wind ; Wind speed</subject><ispartof>Journal of Geophysical Research, 2011-08, Vol.116 (D16), p.n/a, Article D16303</ispartof><rights>Copyright 2011 by the American Geophysical Union.</rights><rights>2015 INIST-CNRS</rights><rights>Copyright 2011 by American Geophysical Union</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c4450-4a7d33bbef137afc748a7411f72bb73aa1658d12b5dadfaa3868bb83a843c0853</citedby><cites>FETCH-LOGICAL-c4450-4a7d33bbef137afc748a7411f72bb73aa1658d12b5dadfaa3868bb83a843c0853</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1029%2F2010JD015440$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1029%2F2010JD015440$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,780,784,1416,1432,11513,27923,27924,45573,45574,46408,46467,46832,46891</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=25518897$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Adames, A. F.</creatorcontrib><creatorcontrib>Reynolds, M.</creatorcontrib><creatorcontrib>Smirnov, A.</creatorcontrib><creatorcontrib>Covert, D. S.</creatorcontrib><creatorcontrib>Ackerman, T. P.</creatorcontrib><title>Comparison of Moderate Resolution Imaging Spectroradiometer ocean aerosol retrievals with ship-based Sun photometer measurements from the Around the Americas expedition</title><title>Journal of Geophysical Research</title><addtitle>J. Geophys. Res</addtitle><description>The Around the Americas expedition was a 25,000 mile sailing circumnavigation of the North and South American continents, in coastal waters, that took place from June 2009 to June 2010. The broad geographical span of the voyage made it possible to measure marine aerosol optical depths in regions where surface measurements are not frequently taken. These were measured with a handheld Microtops II Sun photometer. In this study we compare these measurements with the ocean aerosol product from the Moderate Resolution Imaging Spectroradiometer (MODIS) aboard the Aqua and Terra platforms. Results for aerosol optical depth (AOD) show a strong relationship between both measurements, with most values from MODIS falling within published expectations. However, MODIS values are biased high relative to surface observations for small optical depth values. There appears to be a relationship between these discrepancies in measurements and surface wind speed, with a group of values showing overestimation at wind speeds near and over 6 m/s and a second, smaller group showing underestimation for calmer conditions. For derived Ångström exponents, it is found that higher differences occur at low AOD. No relationship between these differences and wind speed is found.
Key Points
Low AOD values for MODIS are biased high when compared to Microtops
Bias is attributable to surface wind speeds
No trends are observed for Ångström exponent</description><subject>aerosol optical depth</subject><subject>Aerosols</subject><subject>Atmospheric aerosols</subject><subject>Atmospheric sciences</subject><subject>bias</subject><subject>Coastal waters</subject><subject>Earth sciences</subject><subject>Earth, ocean, space</subject><subject>Exact sciences and technology</subject><subject>Geophysics</subject><subject>Microtops</subject><subject>MODIS</subject><subject>ocean</subject><subject>Optical analysis</subject><subject>Photometers</subject><subject>Radiation</subject><subject>wind</subject><subject>Wind speed</subject><issn>0148-0227</issn><issn>2169-897X</issn><issn>2156-2202</issn><issn>2169-8996</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2011</creationdate><recordtype>article</recordtype><sourceid>8G5</sourceid><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GNUQQ</sourceid><sourceid>GUQSH</sourceid><sourceid>M2O</sourceid><recordid>eNp9kc1u1DAURiMEEqPSHQ9gISGxIOC_xJ5lNWVmOpQitSCW0Y1z03FJ4mA7tH0jHhOXjCrEAm9sXZ3v6NN1lr1k9B2jfPmeU0Z3p5QVUtIn2YKzosw5p_xptqBM6pxyrp5nxyHc0HRkUUrKFtmvletH8Da4gbiWfHINeohILjG4boo2jc96uLbDNbka0UTvPDTW9RjRE2cQBgLoXYKJx-gt_oQukFsb9yTs7ZjXELAhV9NAxr2Lh1yPECaPPQ4xkNa7nsQ9khPvpqGZnz16ayAQvBuxsQ81XmTP2qTG48N9lH1df_iy2ubnnzdnq5Pz3EhZ0FyCaoSoa2yZUNAaJTUoyVireF0rAcDKQjeM10UDTQsgdKnrWgvQUhiqC3GUvZm9o3c_Jgyx6m0w2HUwoJtClXYtS6mF4Al99Q964yY_pHbVknIlFGc0QW9nyKQtBY9tNXrbg79PpgfZsvr74xL--uCEYKBrPQzGhscMLwqm9VIlTszcre3w_r_Oare5PGWK_rHnc8qGiHePKfDfqzL1LapvF5tqebFdi_X2Y7UTvwEFN7kI</recordid><startdate>20110827</startdate><enddate>20110827</enddate><creator>Adames, A. F.</creator><creator>Reynolds, M.</creator><creator>Smirnov, A.</creator><creator>Covert, D. S.</creator><creator>Ackerman, T. P.</creator><general>Blackwell Publishing Ltd</general><general>American Geophysical Union</general><scope>BSCLL</scope><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>3V.</scope><scope>7TG</scope><scope>7UA</scope><scope>7XB</scope><scope>8FD</scope><scope>8FE</scope><scope>8FG</scope><scope>8FK</scope><scope>8G5</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AEUYN</scope><scope>AFKRA</scope><scope>ARAPS</scope><scope>ATCPS</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>BHPHI</scope><scope>BKSAR</scope><scope>C1K</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>F1W</scope><scope>FR3</scope><scope>GNUQQ</scope><scope>GUQSH</scope><scope>H8D</scope><scope>H96</scope><scope>HCIFZ</scope><scope>KL.</scope><scope>KR7</scope><scope>L.G</scope><scope>L6V</scope><scope>L7M</scope><scope>M2O</scope><scope>M7S</scope><scope>MBDVC</scope><scope>P5Z</scope><scope>P62</scope><scope>PATMY</scope><scope>PCBAR</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PTHSS</scope><scope>PYCSY</scope><scope>Q9U</scope></search><sort><creationdate>20110827</creationdate><title>Comparison of Moderate Resolution Imaging Spectroradiometer ocean aerosol retrievals with ship-based Sun photometer measurements from the Around the Americas expedition</title><author>Adames, A. 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F.</au><au>Reynolds, M.</au><au>Smirnov, A.</au><au>Covert, D. S.</au><au>Ackerman, T. P.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Comparison of Moderate Resolution Imaging Spectroradiometer ocean aerosol retrievals with ship-based Sun photometer measurements from the Around the Americas expedition</atitle><jtitle>Journal of Geophysical Research</jtitle><addtitle>J. Geophys. Res</addtitle><date>2011-08-27</date><risdate>2011</risdate><volume>116</volume><issue>D16</issue><epage>n/a</epage><artnum>D16303</artnum><issn>0148-0227</issn><issn>2169-897X</issn><eissn>2156-2202</eissn><eissn>2169-8996</eissn><abstract>The Around the Americas expedition was a 25,000 mile sailing circumnavigation of the North and South American continents, in coastal waters, that took place from June 2009 to June 2010. The broad geographical span of the voyage made it possible to measure marine aerosol optical depths in regions where surface measurements are not frequently taken. These were measured with a handheld Microtops II Sun photometer. In this study we compare these measurements with the ocean aerosol product from the Moderate Resolution Imaging Spectroradiometer (MODIS) aboard the Aqua and Terra platforms. Results for aerosol optical depth (AOD) show a strong relationship between both measurements, with most values from MODIS falling within published expectations. However, MODIS values are biased high relative to surface observations for small optical depth values. There appears to be a relationship between these discrepancies in measurements and surface wind speed, with a group of values showing overestimation at wind speeds near and over 6 m/s and a second, smaller group showing underestimation for calmer conditions. For derived Ångström exponents, it is found that higher differences occur at low AOD. No relationship between these differences and wind speed is found.
Key Points
Low AOD values for MODIS are biased high when compared to Microtops
Bias is attributable to surface wind speeds
No trends are observed for Ångström exponent</abstract><cop>Washington, DC</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1029/2010JD015440</doi><tpages>10</tpages><oa>free_for_read</oa></addata></record> |
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| source | Wiley Free Content; Wiley-Blackwell AGU Digital Library; Wiley Online Library All Journals; Alma/SFX Local Collection |
| subjects | aerosol optical depth Aerosols Atmospheric aerosols Atmospheric sciences bias Coastal waters Earth sciences Earth, ocean, space Exact sciences and technology Geophysics Microtops MODIS ocean Optical analysis Photometers Radiation wind Wind speed |
| title | Comparison of Moderate Resolution Imaging Spectroradiometer ocean aerosol retrievals with ship-based Sun photometer measurements from the Around the Americas expedition |
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