[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-detail-217503-en":3,"doc-seo-217503-105":29,"detail-sidebar-cat-0-en-105":95},{"code":4,"msg":5,"data":6},0,"success",{"doc_id":7,"user_id":8,"nickname":9,"user_avatar":10,"doc_module":4,"category_id":11,"category_name":12,"doc_title":13,"doc_description":14,"doc_content":15,"file_id":16,"file_url":17,"file_type":18,"file_size":19,"view_count":20,"is_deleted":4,"is_public":20,"is_downloadable":20,"audit_status":20,"page_count":20,"language":21,"language_code":22,"site_id":23,"html_lang":22,"table_of_contents":24,"faqs":25,"seo_title":26,"seo_description":14,"update_tm":27,"read_time":28},217503,137454149569,"Lute","https://ap-avatar.wpscdn.com/davatar_29158cc5080c5b710cf443261637dec0",8,"Research & Report","Vertical and horizontal transport of water vapour and aerosol in the tropical stratosphere from high-resolution balloon-borne observations","Accurate balloon-borne measurements of water vapor, methane, and aerosol collected during a field campaign in March 2012 over Bauru, Brazil (22.3°S) are used to characterize transport processes in the tropical stratosphere. Vertical profiles reveal coincident enhancements of water vapor and aerosol with methane minima, traced by trajectory analysis to advection from the southern hemisphere extratropical stratosphere. CLaMS chemistry-transport simulations reproduce the intrusion as water-rich and methane-poor filaments extending to 20°S. During a convectively active day, cross-tropopause transport yields water vapor enhancements up to 0.7 ppmv near 405 K, linked to radar-detected convective overshoots.","Vertical and horizontal transport of water vapour and aerosol in the tropical stratosphere from high‐resolution balloon‐borne observations  \nSergey M. Khaykin1, J.‐P. Pommereau1, E. Riviere2, M. Ghysels2, N. Amarouche2, F. Ploegner3, J.‐P. Vernier4,5, F.G. Wienhold6, G. Held7  \n1 LATMOS, CNRS, Université de Versailles St Quentin, Guyancourt, France; 2GSMA, Université de Reims Champagne Ardenne and CNRS, Reims, France;  \n3Forschungszentrum Jülich, IEK‐7, Jülich, Germany; 4Science Systems and Applications, Inc, Hampton, Virginia, US; 5NASA Langley Research center, Hampton, Viriginia, USA; 6ETH Zurich, Institute for Atmospheric and Climate Science, Zurich, Switzerland; 7Instituto de Pesquisas Meteorológicas (IPMet), UNESP, Bauru, S.P., Brazil  \nMeasurements and modeling setup  \nWe present the results of accurate balloon-borne observations of water vapor, methane and aerosol obtained during a field campaign held during March 2012 in Bauru, Brazil (22 .3 S) in the frame of a French TRO-Pico project. The aim of the TRO-Pico project is to characterize the variability and frequency of convective cross-tropopause injections, their contribution at the regional wet season timescale, and to improve the understanding of their role with respect to the cold trap at a wider scale. The balloon payloads flown during the campaign included Pico-SDLA IR laser hygrometers, FLASH-B Lyman-alpha hygrometers, COBALD aerosol backscatter sondes and several other instruments for measurement of gas-phase and particle constituents. An S-band radar operating on the site provided the information on cloud tops. The water vapour profiles obtained by the two different measurement techniques are in excellent agreement, demonstrating high quality of the observations.  \nThe signatures of long-range horizontal transport are inferred from a series of vertical profiles, which show coincident enhancements in water vapour and aerosol accompanied by methane local minima at specific levels in the lowermost stratosphere. Trajectory analysis unambiguously links these features to advection from the southern hemisphere extra-tropical stratosphere, containing more water and aerosol, as demonstrated by MLS and CALIPSO global observations. The intrusion of extratropical air is successfully reproduced by CLaMS chemistry transport model simulation, showing water-rich and methanepoor filaments extending to 20 S.  \nThe signature of local cross-tropopause transport of water is observed during a convectively active day, revealing water vapour enhancements of up to 0.7 ppmv as high as 405 K. These are shown to originate from convective overshoots upwind detected by the local S-band radar. The relative contribution of the horizontal transport and that of local updrafts to the stratospheric humidity is discussed.  \n\n| Measurements |  | TRO-Pico balloon campaign, Brazil, 22°S, Feb-Mar 2012\u003Cbr>• Zero‐pressure plastic 500 and 1500 m3 balloons\u003Cbr>• 500, 800 and 1200 g Totex rubber balloons |  |\n| --- | --- | --- | --- |\n| •FLASH-B (Lyman-alpha fluorescence) H2O profiles\u003Cbr>•COBALD scattering ratio @ 940 nm\u003Cbr>•Pico-SDLA (tunable diode laser) CH4 and H2O profiles\u003Cbr>•Aura MLS water vapour v 3.3\u003Cbr>•CALIOP scattering ratio\u003Cbr>•GOES-12 IR brightness temperature\u003Cbr>•IpMet S-band radar cloud tops\u003Cbr>•Vaisala RS-92 PTU and wind | |  |  |\n|  |  | | \u003Cbr>Launch of 1200 g rubber balloon carrying FLASH and COBALD |\n| Modeling\u003Cbr>\u003Cbr>• NOAA HYSPLIT model initialized by NCEP GDAS analysis (0 .5° x 0 .5°, 52 levels)\u003Cbr>• FZG Julich CLaMS 3-D Chemistry Transport Model initialized by ERA-Interim\u003Cbr>• BRAMS cloud resolving model |  |  |  |\n|  |  | |  |\n\nHorizontal transport  \nRecurring H2O and aerosol enhancements at 420 K (18 .5 km) observed in several soundings  \nH2O SR  \nWV and BSR@940nm profiles obtained during Tro-Pico-1 campaign during March 2012. Successive WV profiles are displaced by 1 ppmv starting from 13 Mar; successive BSR profiles are displaced by 0.3 BSR units starting from 09 Mar.  \nWV, BSR@9","cbCaih4mY3wkdbwQ","https://ap.wps.com/l/cbCaih4mY3wkdbwQ","pdf",701277,1,"English","en",105,"# Measurements and modeling setup\n## Horizontal transport\n## Vertical transport","[{\"question\":\"What observations were collected during the March 2012 Bauru campaign?\",\"answer\":\"The campaign provided balloon-borne profiles of water vapor, methane, and aerosol using multiple instruments, alongside supporting measurements such as radar cloud tops and satellite datasets referenced in the analysis.\"},{\"question\":\"How are long-range horizontal transport signatures identified in the profiles?\",\"answer\":\"They appear as coincident water vapor and aerosol enhancements at specific levels accompanied by methane local minima, then linked to southern hemisphere extratropical advection through trajectory analysis.\"},{\"question\":\"How does local cross-tropopause transport manifest during convective activity?\",\"answer\":\"During a convectively active day, water vapor increases up to 0.7 ppmv near 405 K are observed and attributed to convective overshoots detected by the local S-band radar.\"}]","Vertical and horizontal transport of water vapour and aerosol in the tropical stratosphere from high-resolution balloon-borne observations | PDF",1788833892,3,{"code":4,"msg":30,"data":31},"ok",{"site_id":23,"language":22,"slug":32,"title":13,"keywords":33,"description":14,"schema_data":34,"social_meta":90,"head_meta":92,"extra_data":94,"updated_unix":27},"vertical-and-horizontal-transport-of-water-vapour-and-aerosol-in-the-tropical-stratosphere-from-high-resolution-balloon-borne-observations","",{"@graph":35,"@context":89},[36,52,72],{"@type":37,"itemListElement":38},"BreadcrumbList",[39,43,47,49],{"item":40,"name":41,"@type":42,"position":20},"https://docshare.wps.com","Home","ListItem",{"item":44,"name":45,"@type":42,"position":46},"https://docshare.wps.com/document/","Document",2,{"item":48,"name":12,"@type":42,"position":28},"https://docshare.wps.com/document/research-report/",{"item":50,"name":13,"@type":42,"position":51},"https://docshare.wps.com/document/vertical-and-horizontal-transport-of-water-vapour-and-aerosol-in-the-tropical-stratosphere-from-high-resolution-balloon-borne-observations/217503/",4,{"url":50,"name":13,"@type":53,"image":54,"author":59,"headline":13,"publisher":61,"fileFormat":64,"inLanguage":22,"description":14,"dateModified":65,"datePublished":66,"encodingFormat":64,"isAccessibleForFree":67,"interactionStatistic":68},"DigitalDocument",{"url":55,"@type":56,"width":57,"height":58},"https://docshare.wps.com/thumbnails/vertical-and-horizontal-transport-of-water-vapour-and-aerosol-in-the-tropical-stratosphere-from-high-resolution-balloon-borne-observations/217503.png","ImageObject",300,407,{"name":9,"@type":60},"Person",{"url":40,"name":62,"@type":63},"DocShare","Organization","application/pdf","2026-09-11","2026-09-08",true,{"@type":69,"interactionType":70,"userInteractionCount":20},"InteractionCounter",{"@type":71},"ViewAction",{"@type":73,"mainEntity":74},"FAQPage",[75,81,85],{"name":76,"@type":77,"acceptedAnswer":78},"What observations were collected during the March 2012 Bauru campaign?","Question",{"text":79,"@type":80},"The campaign provided balloon-borne profiles of water vapor, methane, and aerosol using multiple instruments, alongside supporting measurements such as radar cloud tops and satellite datasets referenced in the analysis.","Answer",{"name":82,"@type":77,"acceptedAnswer":83},"How are long-range horizontal transport signatures identified in the profiles?",{"text":84,"@type":80},"They appear as coincident water vapor and aerosol enhancements at specific levels accompanied by methane local minima, then linked to southern hemisphere extratropical advection through trajectory analysis.",{"name":86,"@type":77,"acceptedAnswer":87},"How does local cross-tropopause transport manifest during convective activity?",{"text":88,"@type":80},"During a convectively active day, water vapor increases up to 0.7 ppmv near 405 K are observed and attributed to convective overshoots detected by the local S-band 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