{"id":51172,"date":"2022-09-23T10:56:14","date_gmt":"2022-09-23T08:56:14","guid":{"rendered":"https:\/\/at3w.com\/blog\/effet-de-la-pollution-sur-lincidence-de-la-foudre-pendant-la-pandemie-de-covid-19\/"},"modified":"2022-09-23T10:56:14","modified_gmt":"2022-09-23T08:56:14","slug":"effet-de-la-pollution-sur-lincidence-de-la-foudre-pendant-la-pandemie-de-covid-19","status":"publish","type":"post","link":"https:\/\/at3w.com\/fr\/blog\/effet-de-la-pollution-sur-lincidence-de-la-foudre-pendant-la-pandemie-de-covid-19\/","title":{"rendered":"Effet de la pollution sur l\u2019incidence de la foudre pendant la pand\u00e9mie de COVID-19"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 counter-flat ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/at3w.com\/fr\/blog\/effet-de-la-pollution-sur-lincidence-de-la-foudre-pendant-la-pandemie-de-covid-19\/#Activite_de_la_foudre_sur_Sao_Paulo_et_Belo_Horizonte_Bresil\" >Activit\u00e9 de la foudre sur S\u00e3o Paulo et Belo Horizonte (Br\u00e9sil)<\/a><\/li><li class='ez-toc-page-1'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/at3w.com\/fr\/blog\/effet-de-la-pollution-sur-lincidence-de-la-foudre-pendant-la-pandemie-de-covid-19\/#Influence_du_confinement_sur_lincidence_de_la_foudre_dans_la_vallee_du_Po\" >Influence du confinement sur l\u2019incidence de la foudre dans la vall\u00e9e du P\u00f4<\/a><\/li><\/ul><\/nav><\/div>\n<p>[vc_row][vc_column][vc_column_text]<strong>La corr\u00e9lation entre la pollution par les a\u00e9rosols anthropiques et l&rsquo;activit\u00e9 de la foudre est connue depuis longtemps, mais le m\u00e9canisme qui relie les deux n&rsquo;a pas encore \u00e9t\u00e9 identifi\u00e9. Les mesures de confinement prises pour contenir la pand\u00e9mie de COVID-19 ont \u00e9t\u00e9 une occasion sans pr\u00e9c\u00e9dent d&rsquo;explorer plus en profondeur cette relation.<\/strong><\/p>\n<p>Les \u00e9tudes ant\u00e9rieures \u00e0 2020 sur l&rsquo;effet de la pollution sur l&rsquo;incidence de la foudre montrent une corr\u00e9lation positive des a\u00e9rosols anthropiques avec l&rsquo;augmentation de l&rsquo;activit\u00e9 de coups de foudre dans la zone<sub>1-5<\/sub>. La relation entre ces deux facteurs est complexe, non lin\u00e9aire, et d\u00e9pend de la concentration et du type d&rsquo;a\u00e9rosols<sup>6<\/sup>. D&rsquo;une part, les a\u00e9rosols peuvent agir comme des noyaux de condensation de nuages7, contribuant \u00e0 la formation de gouttelettes, \u00e0 l&rsquo;\u00e9lectrification des nuages et \u00e0 la g\u00e9n\u00e9ration de coups de foudre8. Cependant, des concentrations \u00e9lev\u00e9es de ces a\u00e9rosols pourraient conduire \u00e0 une r\u00e9duction des \u00e9v\u00e9nements de foudre en raison des effets radiatifs <sup>9.10<\/sup>. De plus, l&rsquo;incidence de la foudre d\u00e9pend de la m\u00e9t\u00e9o, ce qui fausse l&rsquo;effet associ\u00e9 aux a\u00e9rosols<sup>11<\/sup>.<\/p>\n<p>Suite \u00e0 la propagation des infections par le coronavirus SRAS-CoV-2, responsable de la maladie respiratoire COVID-19, l<a href=\"https:\/\/www.who.int\/fr\/home\" target=\"_blank\" rel=\"noopener\">&lsquo;OMS (Organisation Mondiale de la Sant\u00e9)<\/a> a reconnu cette \u00e9pid\u00e9mie comme une pand\u00e9mie en mars 2020. Plusieurs pays ont d\u00e9cr\u00e9t\u00e9 le confinement afin d&rsquo;assurer la distanciation sociale.<\/p>\n<p>En cons\u00e9quence directe des restrictions de mobilit\u00e9 et de l&rsquo;arr\u00eat de l&rsquo;activit\u00e9 \u00e9conomique non essentielle, on a pu constater une diminution des \u00e9missions de polluants atmosph\u00e9riques, notamment les particules PM2,5 (particules d&rsquo;un diam\u00e8tre inf\u00e9rieur ou \u00e9gal \u00e0 2,5 microm\u00e8tres) et PM10 (particules d&rsquo;un diam\u00e8tre compris entre 10 et 2,5 microm\u00e8tres)<sup>11-16<\/sup>. Cette occasion unique a permis d&rsquo;analyser en d\u00e9tail la relation entre les a\u00e9rosols et l&rsquo;incidence des coups de foudre en Italie<sup>11<\/sup> et au Br\u00e9sil<sup>12<\/sup>. Dans cet article, nous examinerons bri\u00e8vement ces deux publications.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Activite_de_la_foudre_sur_Sao_Paulo_et_Belo_Horizonte_Bresil\"><\/span><strong>Activit\u00e9 de la foudre sur S\u00e3o Paulo et Belo Horizonte (Br\u00e9sil)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Le 19 mars 2020, les confinements ont commenc\u00e9 dans plusieurs grandes villes du Br\u00e9sil, comme S\u00e3o Paulo et Belo Horizonte. Pour cette raison, Pinto Neto et al.12 ont choisi une p\u00e9riode d&rsquo;analyse allant du 20 mars au 2 avril 2020, compar\u00e9e aux donn\u00e9es obtenues de 2015 \u00e0 2020.<\/p>\n<p>Les auteurs du rapport ont constat\u00e9 une r\u00e9duction consid\u00e9rable de la pollution en 2020 par rapport aux ann\u00e9es pr\u00e9c\u00e9dentes. \u00c0 S\u00e3o Paulo, le pourcentage de coups de foudre nuage-sol \u00e9tait de 4 %, ce qui est nettement inf\u00e9rieur aux valeurs des autres ann\u00e9es. Le courant de cr\u00eate moyen pour la foudre n\u00e9gative nuage-sol \u00e9tait \u00e9galement plus faible qu&rsquo;en 2018, 2016 et 2015. En revanche, dans la ville de Belo Horizonte, le pourcentage de coups de foudre nuage-sol positifs est nettement sup\u00e9rieur aux valeurs des ann\u00e9es pr\u00e9c\u00e9dentes. Dans tous les cas, tous ces aspects d\u00e9tect\u00e9s t\u00e9moignent d&rsquo;une forte influence de la r\u00e9duction de la pollution sur les caract\u00e9ristiques des coups de foudre. De plus, cette influence pourrait \u00eatre diff\u00e9rente dans chaque ville en fonction des diff\u00e9rences de concentration des polluants.<\/p>\n<p>Les r\u00e9sultats de la variation du pourcentage de coups de foudre nuage-sol et nuage-sol positifs de Pinto Neto et al.12 concordent avec ceux rapport\u00e9s par Liu et al.<sup>17<\/sup>. Dans cette \u00e9tude, les r\u00e9gions oc\u00e9aniques pollu\u00e9es et non pollu\u00e9es du sud de la mer de Chine ont \u00e9t\u00e9 compar\u00e9es. Comme il n&rsquo;existe pas de contraste thermodynamique diff\u00e9rent dans les r\u00e9gions oc\u00e9aniques adjacentes, les \u00e9clairs produits dans l&rsquo;oc\u00e9an peuvent servir d&rsquo;indicateur des effets des a\u00e9rosols. Ces travaux ont r\u00e9v\u00e9l\u00e9 une augmentation de la densit\u00e9 moyenne des \u00e9clairs (de 3,7 fois), de la densit\u00e9 des \u00e9clairs intra-nuage (de 5 fois), de la densit\u00e9 des coups de foudre nuage-sol (de 2,5 fois), de la densit\u00e9 des \u00e9clairs positifs \u00e0 la fois intra-nuage (de 6 fois) et nuage-sol (de 14,7 fois) pour la r\u00e9gion pollu\u00e9e par rapport \u00e0 la r\u00e9gion non pollu\u00e9e<sup>17<\/sup>.<\/p>\n<p>Les r\u00e9sultats de l&rsquo;\u00e9tude de Pinto Neto et al.<sup>12<\/sup>\u00a0pendant le confinement au Br\u00e9sil confirment donc les travaux ant\u00e9rieurs o\u00f9 l&rsquo;on consid\u00e8re que l&rsquo;incidence de la foudre est li\u00e9e de mani\u00e8re non lin\u00e9aire \u00e0 la concentration et au type de contamination.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Influence_du_confinement_sur_lincidence_de_la_foudre_dans_la_vallee_du_Po\"><\/span><strong>Influence du confinement sur l\u2019incidence de la foudre dans la vall\u00e9e du P\u00f4<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>La vall\u00e9e du P\u00f4 est une r\u00e9gion tr\u00e8s industrialis\u00e9e du nord de l&rsquo;Italie qui conna\u00eet une forte activit\u00e9 de la foudre en raison de certaines caract\u00e9ristiques m\u00e9t\u00e9orologiques (proximit\u00e9 des montagnes, flux d&rsquo;humidit\u00e9 provenant de la mer Adriatique, convergence des masses d&rsquo;air froid et chaud). De plus, dans cette vall\u00e9e, les conditions de ventilation sont rares et, avec la basse temp\u00e9rature, favorisent la permanence des a\u00e9rosols pendant de longues p\u00e9riodes<sup>11<\/sup>.<\/p>\n<p>Le confinement d\u00e9cr\u00e9t\u00e9 en Italie pour la pand\u00e9mie COVID-19 a \u00e9t\u00e9 prolong\u00e9 du 9 mars au 18 mai 2020, bien que cela ait \u00e9t\u00e9 suivi d&rsquo;une longue p\u00e9riode de d\u00e9sescalade des mesures. Il en a r\u00e9sult\u00e9 une r\u00e9duction drastique de l&rsquo;activit\u00e9 industrielle, du trafic et du transport ferroviaire, ce qui a entra\u00een\u00e9 une diminution de la concentration de PM2,5 et d&rsquo;autres polluants<sup>11<\/sup>.<\/p>\n<p>Cette p\u00e9riode de confinement et de d\u00e9sescalade a co\u00efncid\u00e9 avec une diminution de 70 % de l&rsquo;activit\u00e9 de la foudre, ainsi qu&rsquo;une baisse de 15 % de la concentration de PM2,5 les jours d&rsquo;orage, par rapport \u00e0 la moyenne climatologique de la vall\u00e9e 2017-2020.<\/p>\n<p>Les auteurs du rapport ont tenu compte des changements m\u00e9t\u00e9orologiques qui influencent \u00e9galement la concentration des a\u00e9rosols, mais qui sont ind\u00e9pendants du confinement. Ils ont donc utilis\u00e9 trois param\u00e9trisations de la foudre, bas\u00e9es sur la m\u00e9t\u00e9orologie afin d&rsquo;estimer l&rsquo;effet d&rsquo;une concentration r\u00e9duite de PM2,5 sur l&rsquo;activit\u00e9 de la foudre. Les calculs ont montr\u00e9 qu&rsquo;environ 64% de la diminution de coups de foudre pouvait \u00eatre attribu\u00e9e \u00e0 la m\u00e9t\u00e9orologie, tandis qu&rsquo;environ 36% provenait de la r\u00e9duction des \u00e9missions d&rsquo;a\u00e9rosols<sup>11<\/sup>.<\/p>\n<p>L&rsquo;\u00e9tude du Br\u00e9sil et celle de l&rsquo;Italie confirment la th\u00e9orie selon laquelle les a\u00e9rosols anthropiques ont un impact sur l&rsquo;activit\u00e9 de la foudre. Les r\u00e9sultats de ces \u00e9tudes sont tr\u00e8s int\u00e9ressants \u00e0 appliquer pour optimiser la pr\u00e9diction de la foudre selon les mod\u00e8les climatiques globaux<sup>12<\/sup>\u00a0et la pr\u00e9diction des incendies forestiers caus\u00e9s par la foudre <sup>11,18<\/sup>.<\/p>\n<p>Si vous souhaitez \u00eatre tenu au courant des derni\u00e8res nouvelles sur la foudre et les orages et, surtout, sur les mesures de <a href=\"https:\/\/at3w.com\/fr\/smart-lightning\/paratonnerre-intelligent-dat-controler-remote\/\" target=\"_blank\" rel=\"noopener\">protection<\/a> et de <a href=\"https:\/\/at3w.com\/fr\/smart-lightning\/detecteur-orage-electrique-dans-le-systeme-atstorm\/\" target=\"_blank\" rel=\"noopener\">pr\u00e9vention<\/a> contre les orages, n&rsquo;h\u00e9sitez pas \u00e0 vous inscrire \u00e0 notre newsletter en cliquant <a href=\"https:\/\/at3w.com\/fr\/ou-sommes-nous-contact\/\" target=\"_blank\" rel=\"noopener\">sur le lien suivant<\/a>. Vous pouvez \u00e9galement assister \u00e0 nos sessions de formation gratuites en vous inscrivant via la page <a href=\"https:\/\/at3w.com\/fr\/formation-webinaires\/\" target=\"_blank\" rel=\"noopener\">des webinaires<\/a>.<\/p>\n<p><strong>R\u00e9f\u00e9rences<\/strong><\/p>\n<ol>\n<li>Naccarato, K. P., Pinto Jr., O. &amp; Pinto, I. R. C. A. Evidence of thermal and aerosol effects on the cloud-to-ground lightning density and polarity over large urban areas of Southeastern Brazil. <em>Geophys. Res. Lett.<\/em> <strong>30<\/strong>, 1674 (2003).<\/li>\n<li>Mushtaq, F., Nee Lala, M. G. &amp; Anand, A. <em>Spatio-temporal variability of lightning activity over J&amp;K region and its relationship with topography, vegetation cover, and absorbing aerosol index (AAI)<\/em>. <em>Journal of Atmospheric and Solar-Terrestrial Physics<\/em> vol. 179 (Elsevier Ltd, 2018).<\/li>\n<li>Bell, T. L. <em>et al.<\/em> Midweek increase in U.S. summer rain and storm heights suggests air pollution invigorates rainstorms. <em>J. Geophys. Res.<\/em> <strong>113<\/strong>, (2008).<\/li>\n<li>Williams, E. &amp; Stanfill, S. The physical origin of the land\u2013ocean contrast in lightning activity. <em>Comptes Rendus Phys.<\/em> <strong>3<\/strong>, 1277\u20131292 (2002).<\/li>\n<li>Orville, R. E. <em>et al.<\/em> Enhancement of cloud-to-ground lightning over Houston, Texas. <em>Geophys. Res. Lett.<\/em> <strong>28<\/strong>, 2597\u20132600 (2001).<\/li>\n<li>Farias, W. R. G., Pinto, O., Naccarato, K. P. &amp; Pinto, I. R. C. A. Anomalous lightning activity over the Metropolitan Region of S\u00e3o Paulo due to urban effects. <em>Atmos. Res.<\/em> <strong>91<\/strong>, 485\u2013490 (2009).<\/li>\n<li>Tao, W.-K., Chen, J.-P., Li, Z., Wang, C. &amp; Zhang, C. Impact of aerosols on convective clouds and precipitation. <em>Rev. Geophys.<\/em> <strong>50<\/strong>, RG2001 (2012).<\/li>\n<li>Mansell, E. R. &amp; Ziegler, C. L. Aerosol Effects on Simulated Storm Electrification and Precipitation in a Two-Moment Bulk Microphysics Model. <em>J. Atmos. Sci.<\/em> <strong>70<\/strong>, 2032\u20132050 (2013).<\/li>\n<li>Tan, Y. B., Peng, L., Shi, Z. &amp; Chen, H. R. Lightning flash density in relation to aerosol over Nanjing (China). <em>Atmos. Res.<\/em> <strong>174<\/strong>\u2013<strong>175<\/strong>, 1\u20138 (2016).<\/li>\n<li>Shi, Z., Wang, H., Tan, Y., Li, L. &amp; Li, C. Influence of aerosols on lightning activities in central eastern parts of China. <em>Atmos. Sci. Lett.<\/em> <strong>21<\/strong>, (2020).<\/li>\n<li>P\u00e9rez-Invern\u00f3n, F. J., Huntrieser, H., Gordillo-V\u00e1zquez, F. J. &amp; Soler, S. Influence of the COVID-19 lockdown on lightning activity in the Po Valley. <em>Atmos. Res.<\/em> <strong>263<\/strong>, (2021).<\/li>\n<li>Pinto Neto, O., Pinto, I. R. C. A. &amp; Pinto, O. Lightning during the COVID-19 pandemic in Brazil. <em>J. Atmos. Solar-Terrestrial Phys.<\/em> <strong>211<\/strong>, 105463 (2020).<\/li>\n<li>Cameletti, M. The Effect of Corona Virus Lockdown on Air Pollution: Evidence from the City of Brescia in Lombardia Region (Italy). <em>Atmos. Environ.<\/em> <strong>239<\/strong>, 117794 (2020).<\/li>\n<li>Lolli, S., Chen, Y.-C., Wang, S.-H. &amp; Vivone, G. Impact of meteorological conditions and air pollution on COVID-19 pandemic transmission in Italy. <em>Sci. Rep.<\/em> <strong>10<\/strong>, (2020).<\/li>\n<li>Zoran, M. A., Savastru, R. S., Savastru, D. M. &amp; Tautan, M. N. Assessing the relationship between surface levels of PM2.5 and PM10 particulate matter impact on COVID-19 in Milan, Italy. <em>Sci. Total Environ.<\/em> <strong>738<\/strong>, (2020).<\/li>\n<li>Jones, C. D. <em>et al.<\/em> The Climate Response to Emissions Reductions Due to COVID-19: Initial Results From CovidMIP. <em>Geophys. Res. Lett.<\/em> <strong>48<\/strong>, (2021).<\/li>\n<li>Liu, Y. <em>et al.<\/em> Aerosol Effects on Lightning Characteristics: A Comparison of Polluted and Clean Regimes. <em>Geophys. Res. Lett.<\/em> <strong>47<\/strong>, e2019GL086825 (2020).<\/li>\n<li>P\u00e9rez-Invern\u00f3n, F. J. <em>et al.<\/em> Lightning-ignited wildfires and long-continuing-current lightning in the Mediterranean Basin: Preferential meteorological conditions. <em>Atmos. Chem. Phys.<\/em> (2021) doi:10.5194\/acp-2021-125.<\/li>\n<\/ol>\n<p>[\/vc_column_text][\/vc_column][\/vc_row]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>La corr\u00e9lation entre la pollution par les a\u00e9rosols anthropiques et l&rsquo;activit\u00e9 de la foudre est connue depuis longtemps, mais le m\u00e9canisme qui relie les deux n&rsquo;a pas encore \u00e9t\u00e9 identifi\u00e9. Les mesures de confinement prises pour contenir la pand\u00e9mie de COVID-19 ont \u00e9t\u00e9 une occasion sans pr\u00e9c\u00e9dent d&rsquo;explorer plus en profondeur cette relation.<\/p>\n","protected":false},"author":11,"featured_media":51173,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[5570,5550],"tags":[5680,5748,5639],"class_list":["post-51172","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-paratonnerres","category-smart-lightning-fr","tag-paratonnerres","tag-pda","tag-protection-contre-la-foudre"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.0 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>La foudre et pollution pendant la pand\u00e9mie de COVID-19 AT3w<\/title>\n<meta name=\"description\" content=\"La corr\u00e9lation entre la 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