{"id":14883,"date":"2019-04-03T15:48:21","date_gmt":"2019-04-03T15:48:21","guid":{"rendered":"http:\/\/volcanx.cluster031.hosting.ovh.net\/influence-of-moisture-source-dynamics-and-weather-patterns-on-stable-isotopes-ratios-of-precipitation-in-central-eastern-africa\/"},"modified":"2021-09-16T10:34:53","modified_gmt":"2021-09-16T08:34:53","slug":"influence-dynamique-des-sources","status":"publish","type":"post","link":"https:\/\/volcanofoundation.org\/fr\/influence-dynamique-des-sources\/","title":{"rendered":"INFLUENCES DE LA DYNAMIQUE DES SOURCES D&rsquo;HUMIDIT\u00c9 ET DES R\u00c9GIMES M\u00c9T\u00c9OROLOGIQUES EN AFRIQUE CENTRALE ET ORIENTALE"},"content":{"rendered":"<p>&amp;nbsp ;<\/p>\n<p><span style=\"vertical-align: inherit;\"><span style=\"vertical-align: inherit;\">Charles M. Balagizi <\/span><\/span><sup><span style=\"vertical-align: inherit;\"><span style=\"vertical-align: inherit;\">a, &#8270;<\/span><\/span><\/sup><span style=\"vertical-align: inherit;\"><span style=\"vertical-align: inherit;\"> , Marcelino M. Kasereka <\/span><\/span><sup><span style=\"vertical-align: inherit;\"><span style=\"vertical-align: inherit;\">a<\/span><\/span><\/sup><span style=\"vertical-align: inherit;\"><span style=\"vertical-align: inherit;\"> , Emilio Cuoco <\/span><\/span><sup><span style=\"vertical-align: h&eacute;rit&eacute;;\"><span style=\"vertical-align: h&eacute;rit&eacute;;\">b<\/span><\/span><\/sup><span style=\"vertical-align: h&eacute;rit&eacute;;\"><span style=\"vertical-align: h&eacute;rit&eacute;;\"> , Marcello Liotta <\/span><\/span><sup><span style=\"vertical-align: h&eacute;rit&eacute;;\"><span style=\"vertical-align: h&eacute;rit&eacute;;\">c<\/span><\/span><\/sup>.<\/p>\n<p>&amp;nbsp ;<\/p>\n<p><strong>R&eacute;sum&eacute; :<\/strong> Nous rapportons les premi&egrave;res donn&eacute;es de pr&eacute;cipitations &delta; 18 O et &delta; 2 H de Virunga dans l&rsquo;est de la R&eacute;publique d&eacute;mocratique du Congo, situ&eacute; &agrave; la fronti&egrave;re entre l&rsquo;Afrique centrale et l&rsquo;Afrique de l&rsquo;Est. Le jeu de donn&eacute;es provient de 13 pluviom&egrave;tres d&eacute;ploy&eacute;s dans et autour du Mont Nyiragongo &eacute;chantillonn&eacute;s mensuellement entre d&eacute;cembre 2013 et octobre 2015. Les &delta; 18 O et &delta; 2 H varient respectivement de -6,44 &agrave; 6,16 &permil; et de -32,53 &agrave; 58,89 &permil;, et nous ont permis de d&eacute;finir une LMWL de &delta; 2H = 7. 60&delta; 18O + 16,18. Trois directions principales du vent, &agrave; savoir NE, E et SE, ont &eacute;t&eacute; identifi&eacute;es dans la haute atmosph&egrave;re, correspondant &agrave; trois principales r&eacute;gions sources d&rsquo;humidit&eacute;. En revanche, les vents de basse atmosph&egrave;re sont plus faibles et proviennent principalement du sud et du sud-ouest, <a class=\"glossaryLink\"  aria-describedby=\"tt\"  data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;CE&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;Abr&eacute;viation de &amp;quot;l&amp;#039;&egrave;re commune&amp;quot; ou &amp;quot;l&amp;#039;&egrave;re actuelle&amp;quot;. CE se r&eacute;f&egrave;re &agrave; l&amp;#039;ann&eacute;e &eacute;coul&eacute;e depuis le d&eacute;but de l&amp;#039;&egrave;re actuelle dans le calendrier julien ou gr&eacute;gorien, par exemple l&amp;#039;ann&eacute;e civile. L&amp;#039;&egrave;re pr&eacute;c&eacute;dente est appel&eacute;e &amp;quot;Avant l&amp;#039;&egrave;re actuelle&amp;quot; ou BCE.&lt;\/div&gt;\"  href=\"https:\/\/volcanofoundation.org\/fr\/glossary\/ce-fr\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'  tabindex='0' role='link'>ce<\/a> qui cr&eacute;e un r&eacute;gime d&rsquo;humidit&eacute; plus local, d&eacute;termin&eacute; par la topographie. Cette derni&egrave;re est due &agrave; l&rsquo;accumulation sur le sol de la faille de vapeur d&rsquo;eau du lac Kivu formant une couche de vapeur enrichie en isotopes qui sert de m&eacute;diateur &agrave; l&rsquo;enrichissement isotopique des gouttes de pluie qui tombent. Une forte saisonnalit&eacute; est observ&eacute;e dans les donn&eacute;es &delta; 18 O et &delta; 2 H, et est principalement due &agrave; la variation saisonni&egrave;re et spatiale combin&eacute;e des sources d&rsquo;humidit&eacute;. La saisonnalit&eacute; de &delta; 18O et &delta; 2H est donc corr&eacute;l&eacute;e aux r&eacute;gimes climatiques, car ces derniers contr&ocirc;lent le passage de la saison humide &agrave; la saison s&egrave;che, et vice versa. La caract&eacute;ristique essentielle de la saisonnalit&eacute; est la variation des quantit&eacute;s de pr&eacute;cipitations mensuelles, la temp&eacute;rature mensuelle moyenne de l&rsquo;air &eacute;tant presque constante &agrave; l&rsquo;&eacute;chelle annuelle. Deux processus hydrologiques d&rsquo;importance r&eacute;gionale contribuent &agrave; la signature isotopique : l&rsquo;absorption d&rsquo;humidit&eacute; &agrave; partir des eaux de surface enrichies en isotopes des lacs d&rsquo;Afrique de l&rsquo;Est et &agrave; partir des eaux du sol et des plantes appauvries. Par cons&eacute;quent, la proportion de vapeur d&rsquo;eau de chacun de ces r&eacute;servoirs dans l&rsquo;atmosph&egrave;re entra&icirc;ne l&rsquo;enrichissement ou l&rsquo;appauvrissement en &delta; 2H et &delta; 18. O dans les pr&eacute;cipitations. Ainsi, pendant les p&eacute;riodes humides, la vapeur provenant de l&rsquo;&eacute;vapotranspiration du sol et des plantes domine, produisant des pr&eacute;cipitations appauvries en isotopes, contrairement aux p&eacute;riodes s&egrave;ches o&ugrave; la vapeur provenant de l&rsquo;&eacute;vaporation de la surface des lacs domine, produisant des pr&eacute;cipitations enrichies en isotopes. A l&rsquo;&eacute;chelle mondiale, notre jeu de donn&eacute;es r&eacute;duit les &eacute;carts dans cette r&eacute;gion qui a &eacute;t&eacute; peu &eacute;tudi&eacute;e pour &delta; 18O et &delta; 2H dans la pr&eacute;cipitation. &Agrave; l&rsquo;&eacute;chelle r&eacute;gionale, une meilleure compr&eacute;hension des fa&ccedil;ons dont la couverture terrestre, la dynamique des sources d&rsquo;humidit&eacute; saisonni&egrave;res et spatiales et les mod&egrave;les atmosph&eacute;riques influencent les variabilit&eacute;s spatiales et temporelles des pr&eacute;cipitations en Afrique centrale orientale contribuera aux recherches en cours sur l&rsquo;att&eacute;nuation des impacts du changement climatique dans les courso de l&rsquo;Afrique subsaharienne. La r&eacute;duction des br&egrave;ches et des incertitudes dans les pr&eacute;cipitations &delta;2H et &delta; 18O, et la compr&eacute;hension de leur interrelation avec les mod&egrave;les climatiques sont essentielles pour une meilleure mod&eacute;lisation environnementale et climatique pass&eacute;e, pr&eacute;sente et future aux &eacute;chelles locales et r&eacute;gionales.<\/p>\n<p>&amp;nbsp ;<\/p>\n<p>&amp;nbsp ;<\/p>\n<p><strong>Mots cl&eacute;s :<\/strong> isotopes stables des pr&eacute;cipitations des Virunga. Source d&rsquo;humidit&eacute; pour les Virunga. Variabilit&eacute; des pr&eacute;cipitations des Virunga. Isotopes stables des lacs d&rsquo;Afrique de l&rsquo;Est. Local M&eacute;t&eacute;orique de Virunga<\/p>\n<p>.<br>\n&amp;nbsp ;<\/p>\n<p><sup><span style=\"vertical-align: inherit;\"><span style=\"vertical-align: inherit;\">a<\/span><\/span><\/sup><span style=\"vertical-align: inherit;\"><span style=\"vertical-align: inherit;\"> Departamento de Geoqu&iacute;mica y Medio Ambiente, Observatorio Volc&aacute;n Goma, 142, Av. <\/span><span style=\"vertical-align: inherit;\">du Rond-point, Goma, Rep&uacute;blica Democr&aacute;tica del Congo<\/span><\/span><\/p>\n<p><sup><span style=\"vertical-align: inherit;\"><span style=\"vertical-align: inherit;\">b<\/span><\/span><\/sup><span style=\"vertical-align: inherit;\"><span style=\"vertical-align: inherit;\">Universit&eacute; de la Campanie &laquo;&nbsp;Luigi Vanvitelli&nbsp;&raquo;, Via Vivaldi 43, 81100 Caserta, Italia<\/span><\/span>.<\/p>\n<p><sup><span style=\"vertical-align: inherit;\"><span style=\"vertical-align: inherit;\">c<\/span><\/span><\/sup><span style=\"vertical-align: inherit;\"><span style=\"vertical-align: inherit;\">Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Palermo, Via Ugo La Malfa, 153, 90146 Palermo, Italia<\/span><\/span>. <\/p>\n","protected":false},"excerpt":{"rendered":"<p>Wereport les premi&egrave;res donn&eacute;es &delta;18Oet&delta;2H des pr&eacute;cipitations de Virunga dans l&rsquo;est de la R&eacute;publique d&eacute;mocratique du Congo, situ&eacute; &agrave; la limite entre l&rsquo;Afrique centrale et orientale. Le jeu de donn&eacute;es provient de 13 pluviom&egrave;tres d&eacute;ploy&eacute;s au Mont Nyiragongo et ses environs &eacute;chantillonn&eacute;s mensuellement entre d&eacute;cembre 2013 et octobre 2015. Les &delta;18O et &delta;2H varient respectivement de -6,44 &agrave; 6,16&permil;, et de -32,53 &agrave; 58,89&permil;, et nous ont permis de d&eacute;finir une LMWL de &delta;2H= 7,60&delta;18O+16,18. Trois directions de vent principales, &agrave; savoir NE, E et SE, ont &eacute;t&eacute; identifi&eacute;es dans la haute atmosph&egrave;re, correspondant &agrave; trois r&eacute;gions sources d&rsquo;humidit&eacute;. Au contraire, les vents atmosph&eacute;riques inf&eacute;rieurs sont de nature plus faible et proviennent principalement du S et du SW, cr&eacute;ant un r&eacute;gime d&rsquo;humidit&eacute; plus local, d&eacute;termin&eacute; par la topographie. <a class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;CE&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;Abr&eacute;viation de &amp;quot;l&amp;#039;&egrave;re commune&amp;quot; ou &amp;quot;l&amp;#039;&egrave;re actuelle&amp;quot;. CE se r&eacute;f&egrave;re &agrave; l&amp;#039;ann&eacute;e &eacute;coul&eacute;e depuis le d&eacute;but de l&amp;#039;&egrave;re actuelle dans le calendrier julien ou gr&eacute;gorien, par exemple l&amp;#039;ann&eacute;e civile. L&amp;#039;&egrave;re pr&eacute;c&eacute;dente est appel&eacute;e &amp;quot;Avant l&amp;#039;&egrave;re actuelle&amp;quot; ou BCE.&lt;\/div&gt;\" href=\"https:\/\/volcanofoundation.org\/fr\/glossary\/ce-fr\/\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">Ce<\/a> dernier est d&ucirc; &agrave; l&rsquo;accumulation dans le fond du rift de la vapeur d&rsquo;eau provenant du lac Kivu, formant une couche de vapeur enrichie en isotopes qui favorise l&rsquo;enrichissement isotopique des gouttes de pluie qui tombent. Une forte saisonnalit&eacute; est observ&eacute;e &agrave; la fois dans les donn&eacute;es &delta;18O et &delta;2H, et est principalement dirig&eacute;e par la variation saisonni&egrave;re et spatiale combin&eacute;e des sources d&rsquo;humidit&eacute;. La saisonnalit&eacute; de &delta;18O et &delta;2H est donc corr&eacute;l&eacute;e aux r&eacute;gimes m&eacute;t&eacute;orologiques, car ces derniers contr&ocirc;lent le d&eacute;placement de la saison humide vers la saison s&egrave;che, et vice versa. La caract&eacute;ristique cl&eacute; de la saisonnalit&eacute; est la variation des quantit&eacute;s de pr&eacute;cipitations mensuelles, puisque la temp&eacute;rature mensuelle moyenne de l&rsquo;air est presque constante &agrave; l&rsquo;&eacute;chelle annuelle.<\/p>\n","protected":false},"author":8,"featured_media":14466,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[330],"tags":[431],"doc_authors":[],"doc_languages":[],"class_list":["post-14883","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tout","tag-virunga-fr"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"robots\" content=\"max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n\t<meta name=\"author\" content=\"Anne Fornier\"\/>\n\t<link rel=\"canonical\" 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