[et_pb_section bb_built=\u00a0\u00bb1″ next_background_color=\u00a0\u00bb#000000″ inner_width=\u00a0\u00bbauto\u00a0\u00bb inner_max_width=\u00a0\u00bbnone\u00a0\u00bb][et_pb_row][et_pb_column type=\u00a0\u00bb3_4″][et_pb_text admin_label=\u00a0\u00bbIntro\u00a0\u00bb _builder_version=\u00a0\u00bb3.22.1″ module_id=\u00a0\u00bbintro\u00a0\u00bb text_text_shadow_horizontal_length=\u00a0\u00bbtext_text_shadow_style,%91object Object%93″ text_text_shadow_vertical_length=\u00a0\u00bbtext_text_shadow_style,%91object Object%93″ text_text_shadow_blur_strength=\u00a0\u00bbtext_text_shadow_style,%91object Object%93″ link_text_shadow_horizontal_length=\u00a0\u00bblink_text_shadow_style,%91object Object%93″ link_text_shadow_vertical_length=\u00a0\u00bblink_text_shadow_style,%91object Object%93″ link_text_shadow_blur_strength=\u00a0\u00bblink_text_shadow_style,%91object Object%93″ ul_text_shadow_horizontal_length=\u00a0\u00bbul_text_shadow_style,%91object Object%93″ ul_text_shadow_vertical_length=\u00a0\u00bbul_text_shadow_style,%91object Object%93″ ul_text_shadow_blur_strength=\u00a0\u00bbul_text_shadow_style,%91object Object%93″ ol_text_shadow_horizontal_length=\u00a0\u00bbol_text_shadow_style,%91object Object%93″ ol_text_shadow_vertical_length=\u00a0\u00bbol_text_shadow_style,%91object Object%93″ ol_text_shadow_blur_strength=\u00a0\u00bbol_text_shadow_style,%91object Object%93″ quote_text_shadow_horizontal_length=\u00a0\u00bbquote_text_shadow_style,%91object Object%93″ quote_text_shadow_vertical_length=\u00a0\u00bbquote_text_shadow_style,%91object Object%93″ quote_text_shadow_blur_strength=\u00a0\u00bbquote_text_shadow_style,%91object Object%93″ header_text_shadow_horizontal_length=\u00a0\u00bbheader_text_shadow_style,%91object Object%93″ header_text_shadow_vertical_length=\u00a0\u00bbheader_text_shadow_style,%91object Object%93″ header_text_shadow_blur_strength=\u00a0\u00bbheader_text_shadow_style,%91object Object%93″ header_2_text_shadow_horizontal_length=\u00a0\u00bbheader_2_text_shadow_style,%91object Object%93″ header_2_text_shadow_vertical_length=\u00a0\u00bbheader_2_text_shadow_style,%91object Object%93″ header_2_text_shadow_blur_strength=\u00a0\u00bbheader_2_text_shadow_style,%91object Object%93″ header_3_text_shadow_horizontal_length=\u00a0\u00bbheader_3_text_shadow_style,%91object Object%93″ header_3_text_shadow_vertical_length=\u00a0\u00bbheader_3_text_shadow_style,%91object Object%93″ header_3_text_shadow_blur_strength=\u00a0\u00bbheader_3_text_shadow_style,%91object Object%93″ header_4_text_shadow_horizontal_length=\u00a0\u00bbheader_4_text_shadow_style,%91object Object%93″ header_4_text_shadow_vertical_length=\u00a0\u00bbheader_4_text_shadow_style,%91object Object%93″ header_4_text_shadow_blur_strength=\u00a0\u00bbheader_4_text_shadow_style,%91object Object%93″ header_5_text_shadow_horizontal_length=\u00a0\u00bbheader_5_text_shadow_style,%91object Object%93″ header_5_text_shadow_vertical_length=\u00a0\u00bbheader_5_text_shadow_style,%91object Object%93″ header_5_text_shadow_blur_strength=\u00a0\u00bbheader_5_text_shadow_style,%91object Object%93″ header_6_text_shadow_horizontal_length=\u00a0\u00bbheader_6_text_shadow_style,%91object Object%93″ header_6_text_shadow_vertical_length=\u00a0\u00bbheader_6_text_shadow_style,%91object Object%93″ header_6_text_shadow_blur_strength=\u00a0\u00bbheader_6_text_shadow_style,%91object Object%93″ z_index_tablet=\u00a0\u00bb500″]<\/p>\n
\u00c0 l’\u00e9t\u00e9 2022, des scientifiques venus de toute la France, d’Europe et des \u00c9tats-Unis se r\u00e9uniront pour effectuer des mesures de la composition de l’atmosph\u00e8re en r\u00e9gion parisienne. Le projet appel\u00e9 ACROSS (Atmospheric ChemistRy Of the Suburban ForeSt), port\u00e9 par le professeur Christopher Cantrel (Laboratoire Interuniversitaire des Syst\u00e8mes Atmosph\u00e9riques (LISA) UMR CNRS 7583 unit\u00e9 mixte Universit\u00e9 Paris-Est Cr\u00e9teil, Universit\u00e9 Paris Cit\u00e9 et CNRS) est laur\u00e9at du programme scientifique Make Our Planet Great Again<\/a>.<\/p>\n [\/et_pb_text][\/et_pb_column][et_pb_column type=\u00a0\u00bb1_4″][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=\u00a0\u00bb3.19.11″ module_id=\u00a0\u00bbimage-page-type\u00a0\u00bb width=\u00a0\u00bb80%\u00a0\u00bb max_width=\u00a0\u00bb1080px\u00a0\u00bb][et_pb_column type=\u00a0\u00bb3_4″][et_pb_image admin_label=\u00a0\u00bbImage 1920 x 1080″ _builder_version=\u00a0\u00bb3.22.1″ src=\u00a0\u00bbhttps:\/\/wordpress-test.app.u-pariscite.fr\/sciences\/wp-content\/uploads\/sites\/21\/2022\/06\/Across.jpg\u00a0\u00bb module_id=\u00a0\u00bbimage-page\u00a0\u00bb 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ul_text_shadow_blur_strength=\u00a0\u00bbul_text_shadow_style,%91object Object%93″ ol_text_shadow_horizontal_length=\u00a0\u00bbol_text_shadow_style,%91object Object%93″ ol_text_shadow_vertical_length=\u00a0\u00bbol_text_shadow_style,%91object Object%93″ ol_text_shadow_blur_strength=\u00a0\u00bbol_text_shadow_style,%91object Object%93″ quote_text_shadow_horizontal_length=\u00a0\u00bbquote_text_shadow_style,%91object Object%93″ quote_text_shadow_vertical_length=\u00a0\u00bbquote_text_shadow_style,%91object Object%93″ quote_text_shadow_blur_strength=\u00a0\u00bbquote_text_shadow_style,%91object Object%93″ header_text_shadow_horizontal_length=\u00a0\u00bbheader_text_shadow_style,%91object Object%93″ header_text_shadow_vertical_length=\u00a0\u00bbheader_text_shadow_style,%91object Object%93″ header_text_shadow_blur_strength=\u00a0\u00bbheader_text_shadow_style,%91object Object%93″ header_2_text_shadow_horizontal_length=\u00a0\u00bbheader_2_text_shadow_style,%91object Object%93″ 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link_text_shadow_vertical_length=\u00a0\u00bblink_text_shadow_style,%91object Object%93″ link_text_shadow_blur_strength=\u00a0\u00bblink_text_shadow_style,%91object Object%93″ ul_text_shadow_horizontal_length=\u00a0\u00bbul_text_shadow_style,%91object Object%93″ ul_text_shadow_vertical_length=\u00a0\u00bbul_text_shadow_style,%91object Object%93″ ul_text_shadow_blur_strength=\u00a0\u00bbul_text_shadow_style,%91object Object%93″ ol_text_shadow_horizontal_length=\u00a0\u00bbol_text_shadow_style,%91object Object%93″ ol_text_shadow_vertical_length=\u00a0\u00bbol_text_shadow_style,%91object Object%93″ ol_text_shadow_blur_strength=\u00a0\u00bbol_text_shadow_style,%91object Object%93″ quote_text_shadow_horizontal_length=\u00a0\u00bbquote_text_shadow_style,%91object Object%93″ quote_text_shadow_vertical_length=\u00a0\u00bbquote_text_shadow_style,%91object Object%93″ quote_text_shadow_blur_strength=\u00a0\u00bbquote_text_shadow_style,%91object Object%93″ header_text_shadow_horizontal_length=\u00a0\u00bbheader_text_shadow_style,%91object Object%93″ header_text_shadow_vertical_length=\u00a0\u00bbheader_text_shadow_style,%91object Object%93″ header_text_shadow_blur_strength=\u00a0\u00bbheader_text_shadow_style,%91object Object%93″ header_2_text_shadow_horizontal_length=\u00a0\u00bbheader_2_text_shadow_style,%91object Object%93″ header_2_text_shadow_vertical_length=\u00a0\u00bbheader_2_text_shadow_style,%91object Object%93″ header_2_text_shadow_blur_strength=\u00a0\u00bbheader_2_text_shadow_style,%91object Object%93″ header_3_text_shadow_horizontal_length=\u00a0\u00bbheader_3_text_shadow_style,%91object Object%93″ header_3_text_shadow_vertical_length=\u00a0\u00bbheader_3_text_shadow_style,%91object Object%93″ header_3_text_shadow_blur_strength=\u00a0\u00bbheader_3_text_shadow_style,%91object Object%93″ header_4_text_shadow_horizontal_length=\u00a0\u00bbheader_4_text_shadow_style,%91object Object%93″ header_4_text_shadow_vertical_length=\u00a0\u00bbheader_4_text_shadow_style,%91object Object%93″ header_4_text_shadow_blur_strength=\u00a0\u00bbheader_4_text_shadow_style,%91object Object%93″ header_5_text_shadow_horizontal_length=\u00a0\u00bbheader_5_text_shadow_style,%91object Object%93″ header_5_text_shadow_vertical_length=\u00a0\u00bbheader_5_text_shadow_style,%91object Object%93″ header_5_text_shadow_blur_strength=\u00a0\u00bbheader_5_text_shadow_style,%91object Object%93″ header_6_text_shadow_horizontal_length=\u00a0\u00bbheader_6_text_shadow_style,%91object Object%93″ header_6_text_shadow_vertical_length=\u00a0\u00bbheader_6_text_shadow_style,%91object Object%93″ header_6_text_shadow_blur_strength=\u00a0\u00bbheader_6_text_shadow_style,%91object Object%93″ z_index_tablet=\u00a0\u00bb500″]<\/p>\n Le projet d\u00e9ploiera une grande vari\u00e9t\u00e9 d’instruments sur un site de tour dans la for\u00eat de Rambouillet, sur un b\u00e2timent du campus de Universit\u00e9 Paris Cit\u00e9, sur un site de mesure existant en banlieue (SIRTA) et \u00e0 partir d’un avion de recherche de la flotte fran\u00e7aise exploit\u00e9 par Safire (Service des Avions Fran\u00e7ais Instrument\u00e9s pour la Recherche en Environnement). L’objectif principal de la collecte de ces donn\u00e9es est d’\u00e9valuer si la chimie et la physique de l’atmosph\u00e8re sont diff\u00e9rentes lorsque les \u00e9missions des r\u00e9gions urbaines (anthropiques ou caus\u00e9es par l’homme) et les \u00e9missions des for\u00eats rurales (biog\u00e9niques) se m\u00e9langent et r\u00e9agissent. On suppose qu’il pourrait y avoir des changements dans la production d’oxydants (comme l’ozone), dans la r\u00e9partition des compos\u00e9s azot\u00e9s r\u00e9actifs (oxydes d’azote, nitrates organiques), dans les voies de r\u00e9action des compos\u00e9s organiques et dans les impacts sur la formation, l’\u00e9volution et les propri\u00e9t\u00e9s des a\u00e9rosols.<\/p>\n Le site de mesure de la for\u00eat de Rambouillet est mis \u00e0 la disposition du projet ACROSS par une convention avec l’Office National des For\u00eats (ONF). Il comprend une tour de 40 m\u00e8tres de haut qui \u00e9tait utilis\u00e9e par l’ONF pour rechercher les feux de for\u00eat dans la r\u00e9gion. Pour la campagne, plusieurs instruments seront dispos\u00e9s au sommet de la tour et dans des conteneurs au sol pour effectuer des mesures de la composition de l’atmosph\u00e8re dans cet environnement.<\/p>\n Les instruments de l’avion ATR-42 surveilleront le panache de pollution de Paris lorsqu’il sera transport\u00e9 sous le vent, se m\u00e9langeant parfois aux \u00e9missions biog\u00e9niques (en fonction de la direction du vent). Les vents d’Est Nord-Est sont particuli\u00e8rement int\u00e9ressants car le panache impactera le site de Rambouillet, mais d’autres directions de vent seront \u00e9galement int\u00e9ressantes et pr\u00e9cieuses pour contraster avec la situation id\u00e9ale. L’avion volera principalement \u00e0 basse altitude (300 m\u00e8tres au-dessus du sol) pour surveiller le plus directement possible le panache lorsqu’il interagit avec les \u00e9missions biog\u00e8nes de la surface. Il peut \u00e9galement y avoir un profilage entre 300 m\u00e8tres et 3 kilom\u00e8tres au-dessus du sol pour \u00e9valuer la repr\u00e9sentativit\u00e9 des mesures \u00e0 basse altitude. Les sch\u00e9mas de vol consisteront en des p\u00e9n\u00e9trations en va-et-vient du panache \u00e0 diff\u00e9rentes distances sous le vent afin d’\u00e9valuer l’\u00e9volution de la composition du panache au fur et \u00e0 mesure de son transport et de son traitement.<\/p>\n Les sites \u00e0 Paris et en banlieue fournissent des informations sur les conditions du panache lorsque les \u00e9missions provenant du trafic, de la production d’\u00e9nergie et de l’industrie sont relativement fra\u00eeches et ont \u00e9t\u00e9 tr\u00e8s peu trait\u00e9es. Cela fournit certaines contraintes sur les \u00e9missions des esp\u00e8ces cl\u00e9s qui peuvent \u00eatre utilis\u00e9es pour initialiser les mod\u00e8les informatiques qui seront utilis\u00e9s pour comparer la compr\u00e9hension actuelle des processus chimiques atmosph\u00e9riques avec les observations. Il existe plusieurs types de mod\u00e8les, plus ou moins sophistiqu\u00e9s, qui sont utilis\u00e9s pour concevoir des sc\u00e9narios de contr\u00f4le de la pollution atmosph\u00e9rique. Les observations du SSMAEC permettront de tester la fiabilit\u00e9 de ces mod\u00e8les.<\/p>\n Site du Projet ACROSS<\/a><\/p>\n [\/et_pb_text][\/et_pb_column][et_pb_column type=\u00a0\u00bb1_4″][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section bb_built=\u00a0\u00bb1″ specialty=\u00a0\u00bboff\u00a0\u00bb _builder_version=\u00a0\u00bb3.21″ custom_padding=\u00a0\u00bb0px||0px|\u00a0\u00bb prev_background_color=\u00a0\u00bb#000000″ inner_width=\u00a0\u00bbauto\u00a0\u00bb inner_max_width=\u00a0\u00bbnone\u00a0\u00bb][et_pb_row _builder_version=\u00a0\u00bb3.19.11″ width=\u00a0\u00bb80%\u00a0\u00bb max_width=\u00a0\u00bb1080px\u00a0\u00bb][et_pb_column type=\u00a0\u00bb4_4″][et_pb_text admin_label=\u00a0\u00bb\u00c0 lire aussi\u00a0\u00bb _builder_version=\u00a0\u00bb3.21″]<\/p>\n [\/et_pb_text][et_pb_blog _builder_version=\u00a0\u00bb3.21″ posts_number=\u00a0\u00bb4″ include_categories=\u00a0\u00bb13″ show_author=\u00a0\u00bboff\u00a0\u00bb show_date=\u00a0\u00bboff\u00a0\u00bb show_pagination=\u00a0\u00bboff\u00a0\u00bb border_width_bottom_fullwidth=\u00a0\u00bb1px\u00a0\u00bb border_color_bottom_fullwidth=\u00a0\u00bbrgba(51,51,51,0.18)\u00a0\u00bb custom_padding=\u00a0\u00bb||50px|\u00a0\u00bb module_id=\u00a0\u00bbpage_type_blog\u00a0\u00bb header_level=\u00a0\u00bbh4″ \/][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":" \u00c0 l’\u00e9t\u00e9 2022, des scientifiques venus de toute la France, d’Europe et des \u00c9tats-Unis se r\u00e9uniront pour effectuer des mesures de la composition de l’atmosph\u00e8re en r\u00e9gion parisienne. Le projet appel\u00e9 ACROSS (Atmospheric ChemistRy Of the Suburban ForeSt), port\u00e9 par le professeur Christopher Cantrel (Laboratoire Interuniversitaire des Syst\u00e8mes Atmosph\u00e9riques (LISA) UMR CNRS 7583 unit\u00e9… Lire la suite <\/span><\/a><\/p>\n","protected":false},"author":398,"featured_media":3552,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[60,1],"tags":[],"class_list":["post-1597","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-environnement","category-faculte-de-sciences"],"_links":{"self":[{"href":"https:\/\/wordpress-test.app.u-pariscite.fr\/sciences\/wp-json\/wp\/v2\/posts\/1597","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wordpress-test.app.u-pariscite.fr\/sciences\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wordpress-test.app.u-pariscite.fr\/sciences\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wordpress-test.app.u-pariscite.fr\/sciences\/wp-json\/wp\/v2\/users\/398"}],"replies":[{"embeddable":true,"href":"https:\/\/wordpress-test.app.u-pariscite.fr\/sciences\/wp-json\/wp\/v2\/comments?post=1597"}],"version-history":[{"count":6,"href":"https:\/\/wordpress-test.app.u-pariscite.fr\/sciences\/wp-json\/wp\/v2\/posts\/1597\/revisions"}],"predecessor-version":[{"id":3551,"href":"https:\/\/wordpress-test.app.u-pariscite.fr\/sciences\/wp-json\/wp\/v2\/posts\/1597\/revisions\/3551"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/wordpress-test.app.u-pariscite.fr\/sciences\/wp-json\/wp\/v2\/media\/3552"}],"wp:attachment":[{"href":"https:\/\/wordpress-test.app.u-pariscite.fr\/sciences\/wp-json\/wp\/v2\/media?parent=1597"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wordpress-test.app.u-pariscite.fr\/sciences\/wp-json\/wp\/v2\/categories?post=1597"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wordpress-test.app.u-pariscite.fr\/sciences\/wp-json\/wp\/v2\/tags?post=1597"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}\u00c0<\/span> lire aussi<\/h2>\n