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<!DOCTYPE HTML><html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html;charset=utf-8" /> <link rel="stylesheet" type="text/css" href="https://www.giss.nasa.gov/css/css2104.css" media="all" /> <title>GACP: GACP Datasets</title> <link rel="apple-touch-icon" href="/gfx/apple-touch-icon-180x180.png" /> <link rel="apple-touch-icon-precomposed" href="/gfx/apple-touch-icon-180x180.png" /> <link rel="apple-touch-icon" sizes="192x192" href="/gfx/apple-touch-icon-192x192.png" /> <link rel="apple-touch-icon" sizes="180x180" href="/gfx/apple-touch-icon-180x180.png" /> <link rel="apple-touch-icon" sizes="152x152" href="/gfx/apple-touch-icon-152x152.png" /> <link rel="apple-touch-icon" sizes="128x128" href="/gfx/apple-touch-icon-128x128.png" /> <link rel="apple-touch-icon" sizes="76x76" href="/gfx/apple-touch-icon-76x76.png" /> <meta name="orgcode" content="611" /> <meta name="rno" content="Brian.Cairns.1" /> <meta name="content-owner" content="Robert.B.Schmunk.1" /> <meta name="webmaster" content="Robert.B.Schmunk.1" /> <meta name="viewport" content="width=956, initial-scale=1" /><script id="_fed_an_ua_tag" src="https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=NASA&subagency=GISS&yt=true&dclink=true" async="async"></script> </head> <body> <div id="bkg1"><div id="bkg2"></div></div> <div id="page"> <div id="archive"> <p>This page's content is no longer actively maintained, but the material has been kept on-line for historical purposes.<br />The page may contain broken links or outdated information, and parts may not function in current web browsers.</p></div> <div class="hidden"> <a href="#content" title="Go to Main Content" accesskey="2">Go to Main Content (Accesskey 2)</a><br /><a href="#nav" title="Go to Site Menu" accesskey="3">Go to Site Menu (Accesskey 3)</a></div> <div id="header"> <div id="headerlogo"> <a href="https://www.nasa.gov/"><img src="https://www.giss.nasa.gov/gfx/2013/nasa_x2.png" alt="NASA Logo, National Aeronautics and Space Administration" style="width:140px;height:98px" /></a></div> <div id="centername"> <h1><a href="https://www.nasa.gov/">National Aeronautics and Space Administration</a></h1> <h2><a href="https://www.giss.nasa.gov/">Goddard Institute for Space Studies</a></h2></div> <div id="hierarchy"> <h2><a href="https://www.nasa.gov/goddard/">Goddard Space Flight Center</a><br /><a href="https://science.gsfc.nasa.gov/sci">Sciences and Exploration Directorate</a><br /><a href="https://science.gsfc.nasa.gov/earth">Earth Sciences Division</a></h2></div></div> <div id="banner" style="height:98px"> <a href="https://gacp.giss.nasa.gov/"> <img src="https://www.giss.nasa.gov/gfx/bnrs/gacp_950x98.jpg" style="width:950px;height:98px;border:0" alt="Global Aerosol Climatology Project" /></a></div> <div id="paper"> <div id="content"><div id="cpad"> <h2>GACP Datasets</h2> <h3 id="retrieval"> Global Aerosol Climatology for the Period August 1981 to December 2009</h3> <p> The GACP aerosol optical thickness and Angstrom exponent dataset was initially created covering the time period August 1981 through June 2005. In 2015 the dataset was updated and extended through December 2009 using NOAA-17 and -18 AVHRR data. Monthly averages of the aerosol optical thickness (AOT) for the full period from August 1981 through December 2009 can be downloaded from <a href="/data/time_ser/">gacp.giss.nasa.gov/data/time_ser/</a>. All files are in plain ASCII text and compressed using gzip. </p>   <p> The files format is as follows: the first line indicates the respective year and month and is followed by 180 rows of 360 floating point numbers. Each number represents the monthly average of the corresponding quantity in the respective 1°×1° grid box. The top row represents the northmost grid boxes (89°N-90°N). The first column represents the 180°W-179°W grid boxes. Absence of data is indicated by -1. </p> <p>Journal articles related to the production of this dataset are listed on the <a href="/publications/">GACP publications page</a>.</p> <p>For more information about the data, please contact <a href="https://www.giss.nasa.gov/staff/igeogdzhayev.html">Dr. Igor Geogdzhayev</a></p> <h4>Transport Models</h4> <p>Joyce Penner's <a href="transport/workshop5.pdf">Summary of the IPCC Model Intercomparison Workshop</a> (PDF)</p> <p>Ina Tegen's <a href="transport/">Aerosol Optical Thickness Results from Chemistry/Transport Models</a>. <h4>Related Datasets</h4> <p>Brent Holben's <a href="holben.pdf">Summary of Aerosol Datasets</a> (PDF) </p> <p>Andrew Lacis' Database of Aerosol Spectral Refractive Indices</p> <ul> <li>Introduction: <a href="lacis/introduction.pdf">PDF</a></li> <li><a href="https://www.giss.nasa.gov/staff/mmishchenko/ftpcode/lacis/lacis_refrac.rhwmri.f"> FORTRAN subroutine</a> for calculating aerosol spectral refractive indices</li> <li>Plots of aerosol spectral refractive indices (<a href="lacis/plots.pdf">PDF</a>)</li> </ul> <p>Trish Quinn's <a href="/meeting/meet2/quinn_minutes.pdf">ACE 2 Summary</a> (PDF) </p> <p>Philip Russell's Process & Closure Study Data Summary: <a href="Russell-part1.pdf">Part 1</a>; <a href="/meeting/meet2/russell_minutes.pdf">Part 2</a> PDFs</p> <h3>Individual Aerosol Datasets</h3> <ul> <li><a href="Charlock.html">Thomas P. Charlock</a></li> <li><a href="Ferrare.html">Rich Ferrare</a></li> <li><a href="Halthore.html">Rangasayi N. Halthore</a></li> <li><a href="Herber.html">Andreas Herber</a></li> <li><a href="Hobbs.html">Peter V. Hobbs</a></li> <li><a href="Holben.html">Brent Holben</a></li> <li><a href="Kapustin.html">Vladimir Kapustin</a></li> <li><a href="Kent.html">Geoffrey S. Kent</a></li> <li><a href="Liepert.html">Beate Liepert</a></li> <li><a href="Livingston.html">John M. Livingston</a></li> <li><a href="Novakov.html">Tica Novakov</a></li> <li><a href="Ogren.html">John Ogren</a></li> <li><a href="Prospero.html">Joseph M. Prospero and Dennis L. Savoie</a></li> <li><a href="Quinn.html">Patricia Quinn</a></li> <li><a href="Russell.html">Philip B. Russell</a></li> <li><a href="Schmid.html">Beat Schmid</a></li> <li><a href="Tratt.html">David M. Tratt</a></li> <li><a href="Turner.html">Dave Turner and Rich Ferrare</a></li> <li><a href="Westphal.html">Douglas Westphal</a></li> </ul> <p class="ednote"> Note: PDF documents require the free <a href="http://get.adobe.com/reader/">Adobe Reader</a> or compatible viewing software to be viewed. </p> <div class="clear"></div></div></div> <div id="nav"><h3>Site Menu</h3> <ul class="snav"><li><a href="https://gacp.giss.nasa.gov/">GACP Home</a></li><li><a href="https://gacp.giss.nasa.gov/publications/">GACP Publications</a></li><li class="sel"><a href="https://gacp.giss.nasa.gov/datasets/">GACP Datasets</a></li><li><a href="https://gacp.giss.nasa.gov/projects/">GACP Projects</a></li><li><a href="https://gacp.giss.nasa.gov/campaigns/">GACP Field Campaigns</a></li><li><a href="https://gacp.giss.nasa.gov/meeting/">GACP Meetings</a></li></ul><hr /><ul id="mnav"> <li><a href="https://www.giss.nasa.gov/">GISS Home</a></li> <li><a href="https://www.giss.nasa.gov/research/">News & Features</a> <ul 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