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Wavelength selection targets a CO2 absorption line at 1572.33 nm and an O2 doublet near 764.7 nm, enabling estimation of column CO2 and O2 number density to cloud tops and the retrieval of CO2 above, within, and around broken or thin cloud conditions. Results are demonstrated using ASCENDS airborne campaign flights in 2011 and flight data from multiple in-situ instruments, including aircraft sensors and radiosondes.",{"@graph":63,"@context":119},[64,80,102],{"@type":65,"itemListElement":66},"BreadcrumbList",[67,71,74,77],{"item":68,"name":69,"@type":70,"position":9},"https://docshare.wps.com","Home","ListItem",{"item":72,"name":10,"@type":70,"position":73},"https://docshare.wps.com/template/",2,{"item":75,"name":11,"@type":70,"position":76},"https://docshare.wps.com/template/presentations/",3,{"item":78,"name":59,"@type":70,"position":79},"https://docshare.wps.com/template/retrieval-of-lower-atmospheric-co2-with-clouds-from-airborne-ipda-lidar-measurements-jianping-mao/239242/",4,{"url":78,"name":59,"@type":81,"image":82,"author":87,"headline":59,"publisher":90,"fileFormat":93,"inLanguage":57,"description":61,"dateModified":94,"datePublished":95,"encodingFormat":93,"isAccessibleForFree":96,"interactionStatistic":97},"DigitalDocument",{"url":83,"@type":84,"width":85,"height":86},"https://docshare.wps.com/thumbnails/retrieval-of-lower-atmospheric-co2-with-clouds-from-airborne-ipda-lidar-measurements-jianping-mao/239242.png","ImageObject",442,249,{"name":88,"@type":89},"Jacob","Person",{"url":68,"name":91,"@type":92},"DocShare","Organization","application/pdf","2026-10-30","2026-09-11",true,{"@type":98,"interactionType":99,"userInteractionCount":101},"InteractionCounter",{"@type":100},"ViewAction",9,{"@type":103,"mainEntity":104},"FAQPage",[105,111,115],{"name":106,"@type":107,"acceptedAnswer":108},"What does the airborne IPDA lidar approach measure simultaneously?","Question",{"text":109,"@type":110},"It measures CO2 and O2 absorption simultaneously in the vertical path to the surface using pulsed lasers at selected wavelengths.","Answer",{"name":112,"@type":107,"acceptedAnswer":113},"Which wavelength features are used for the CO2 and O2 retrievals?",{"text":114,"@type":110},"The approach uses the CO2 absorption line at 1572.33 nm and the O2 line doublet near 764.7 nm.",{"name":116,"@type":107,"acceptedAnswer":117},"How does the method handle broken or thin clouds during CO2 retrieval?",{"text":118,"@type":110},"Time-resolved backscatter profiles enable estimation of CO2 to cloud tops and retrieval of CO2 above clouds, allowing sampling of vertical CO2 structure when clouds are broken or thin.","https://schema.org",{"og:url":78,"og:type":121,"og:title":59,"og:site_name":91,"og:description":61},"article",{"robots":123,"canonical":78},"index,follow",{"doc_id":125,"site_id":56},239242,1791153235,{"code":4,"msg":5,"data":128},{"doc_id":125,"user_id":129,"nickname":88,"user_avatar":130,"doc_module":9,"category_id":8,"category_name":11,"doc_title":59,"doc_description":61,"doc_content":131,"file_id":132,"file_url":133,"file_type":134,"file_size":135,"view_count":101,"is_deleted":4,"is_public":9,"is_downloadable":9,"audit_status":9,"page_count":9,"language":136,"language_code":57,"site_id":56,"html_lang":57,"table_of_contents":137,"faqs":138,"seo_title":139,"seo_description":61,"update_tm":140,"read_time":4},962084931830,"https://ap-avatar.wpscdn.com/davatar_a8503ba1806abce46bf441b54a3ca4cd","| Retrieval of Lower Atmospheric CO2 with Clouds from Airborne IPDALidar Measurements\u003Cbr>Jianping Mao 1 , Anand Ramanathan2 , Graham R. Allan3 , Michael Rodriquez3 , William E. Hasselbrack3 , James B. Abshire4 , Haris Riris4 , Stephan R. Kawa5 , Clark Weaver 1 , Edward V. Browell6\u003Cbr>1 Earth System Science Interdisciplinary Center, University of Maryland; 2 ORAU; 3 Sigma Space Inc.; 4 Solar System Exploration Division; 5Atmospheric Chemistry and Dynamics Lab., NASA Goddard Space Flight Center, Greenbelt, MD 20771;\u003Cbr>6 STARSS-II, NASA Langley Research Center, Hampton, VA 23681, USA\u003Cbr>GSFC\u003Cbr>\u003Cbr>Email: [Jianping.Mao@nasa.gov](Jianping.Mao@nasa.gov)\u003Cbr>|\n| --- |\n| \u003Cbr>\u003Cbr>Introduction\u003Cbr>NASA Goddard Space Flight Center has developed an integrated-path differential absorption (IPDA) lidar approach to measure atmospheric CO2 concentrations from space as a candidate for NASA’s space mission ASCENDS –Active Sensing of CO2 Emissions over Nights, Days, and Seasons. The approach uses pulsed lasers to measure both CO2 and O2 absorption simultaneously in the vertical path to the surface at a number of wavelengths across a CO2 line at 1572.33 nm and the O2 line doublet near 764.7 nm . Measurements of time-resolved laser backscatter profiles from the atmosphere allow the technique to estimate column CO2 and O2 number density to cloud tops in additional to the ground. This allows retrieving CO2 above clouds and sampling the vertical structure of CO2 when broken and/or thin clouds are present, which helps identify sources/sinks of CO2 near the surface.\u003Cbr>The NASA Goddard lidar team participated in the ASCENDS airborne measurement campaign in summer 2011 and flew over a variety of different sites in the U.S., along with other ASCENDS airborne lidar candidates and accurate in-situ atmospheric sensors .\u003Cbr>Here, we demonstrate the capability of our approach to resolve two vertical layers of CO2 in our flight over Iowa .\u003Cbr>\u003Cbr>2011 ASCENDS Campaign Flights-Ground Tracks\u003Cbr>\u003Cbr>\u003Cbr>Sci 1-Jul 28-Central Valley of California (including smoke layer near Sierra mountains) Sci 2-Aug 2 -Pacific Ocean Stratus Clouds off Calif. Coast (broken clouds, cloud deck) Sci 3-Aug 3 -Railroad Valley Nevada (plus scattered clouds and snow patches) Sci 4-Aug 7 -Snow & ice on mountains in Pacific Northwest\u003Cbr>Sci 5-Aug 9 -Four Corners NM area;\u003Cbr>Sci 6-Aug 10-Eastern Iowa (large CO2 drawdown from agriculture) and CO2 tower Sci 7-Aug 11-Forested Area near the WLEF tall CO2 tower in Park Falls, WI.\u003Cbr>\u003Cbr>2011 flights had a very wide variety of conditions:\u003Cbr>• Much wider than previous campaigns:\u003Cbr>• Surface: mountains, snow, trees, ocean, desert\u003Cbr>• Atmosphere: smoke, broken clouds, cloud tops, cirrus\u003Cbr>• Required enhancing our analysis approaches (ongoing)\u003Cbr>\u003Cbr>In-situ Data\u003Cbr>CO2 profiles from spiral down segments\u003Cbr>Power plant plume in Four Corners\u003Cbr>\u003Cbr>\u003Cbr>IA corn power plant plume\u003Cbr>marine cloud deck\u003Cbr>• AVOCET and Picarro CO2 along flight tracks and vertical profiles during spiral down flights\u003Cbr>• LaRC on-site radiosondes-Z, P, T, H2O on 7/28 and 8/3\u003Cbr>• DC-8 REVEAL flight data (flight altitude, P, T, H2O, radar ground elevation, aircraft pitch/roll angles, etc)\u003Cbr>• Other – weather stations and model analysis data\u003Cbr>TEMPLATE DESIGN © 2008\u003Cbr>[www.PosterPresentations.com](www.PosterPresentations.com)\u003Cbr>Lidar Backscatter Profiles , Scie nce Flight 6, Aug. 10 , 2011 \u003Cbr>DAOF Palmdale Ca.\u003Cbr>\u003Cbr>Rocky Mountain s Den ver Co.\u003Cbr>\u003Cbr>SF-6 Iowa Flight WestBranch Ia. \u003Cbr>WestBranch Ia.\u003Cbr>\u003Cbr>WestBranch Ia. Minneapolis Range Corrected 1µs Vertical Integration 1s Horizontal track \u003Cbr>\u003Cbr>Sensitivity Analysis fo\u003Cbr>\u003Cbr>-20 ppm\u003Cbr>~ 20 ppmv drawdown over cornfield in the West Branch, IA, during Science Flight 6 to Iowa on Aug. 10, 2011. The columnaverage XCO2:\u003Cbr>surface-2 km: 367 ppmv 2-12 km: 386 ppmv surface-12 km: 381 ppmv\u003Cbr>\u003Cbr>Real CO2 profile vs 385 ppm in the PBL\u003Cbr>• The maximum response in optical depth at\u003Cbr>\u003Cbr>CO2 weighting functions\u003Cbr>\u003Cbr","cbCaiv7WM5UrC6li","https://ap.wps.com/l/cbCaiv7WM5UrC6li","pdf",1269534,"English","# Introduction\n## ASCENDS 2011 Campaign Flights-Ground Tracks\n## In-situ Data\n## Lidar Backscatter Profiles and Flight Demonstration\n## Sensitivity and Bias Considerations\n## Vertical Information","[{\"question\":\"What does the airborne IPDA lidar approach measure simultaneously?\",\"answer\":\"It measures CO2 and O2 absorption simultaneously in the vertical path to the surface using pulsed lasers at selected wavelengths.\"},{\"question\":\"Which wavelength features are used for the CO2 and O2 retrievals?\",\"answer\":\"The approach uses the CO2 absorption line at 1572.33 nm and the O2 line doublet near 764.7 nm.\"},{\"question\":\"How does the method handle broken or thin clouds during CO2 retrieval?\",\"answer\":\"Time-resolved backscatter profiles enable estimation of CO2 to cloud tops and retrieval of CO2 above clouds, allowing sampling of vertical CO2 structure when clouds are broken or thin.\"}]","Retrieval of Lower Atmospheric CO2 with Clouds from Airborne IPDA Lidar Measurements - Jianping Mao | PDF",1789145863]