{"id":8908,"date":"2026-03-03T00:26:36","date_gmt":"2026-03-02T23:26:36","guid":{"rendered":"https:\/\/www.polarpod.fr\/?page_id=8908"},"modified":"2026-03-03T00:26:36","modified_gmt":"2026-03-02T23:26:36","slug":"mesures-de-la-fluorescence","status":"publish","type":"page","link":"https:\/\/www.polarpod.fr\/fr\/perseverance\/mesures-de-la-fluorescence\/","title":{"rendered":"Mesures de la fluorescence"},"content":{"rendered":"[vc_row type=\u00a0\u00bbfull_width_background\u00a0\u00bb full_screen_row_position=\u00a0\u00bbmiddle\u00a0\u00bb column_margin=\u00a0\u00bbdefault\u00a0\u00bb column_direction=\u00a0\u00bbdefault\u00a0\u00bb column_direction_tablet=\u00a0\u00bbdefault\u00a0\u00bb column_direction_phone=\u00a0\u00bbdefault\u00a0\u00bb bg_color=\u00a0\u00bb#454156&Prime; scene_position=\u00a0\u00bbcenter\u00a0\u00bb top_padding=\u00a0\u00bb4%\u00a0\u00bb bottom_padding=\u00a0\u00bb0%\u00a0\u00bb text_color=\u00a0\u00bblight\u00a0\u00bb text_align=\u00a0\u00bbleft\u00a0\u00bb row_border_radius=\u00a0\u00bbnone\u00a0\u00bb row_border_radius_applies=\u00a0\u00bbbg\u00a0\u00bb overflow=\u00a0\u00bbvisible\u00a0\u00bb id=\u00a0\u00bbintro\u00a0\u00bb row_name=\u00a0\u00bbIntro\u00a0\u00bb color_overlay=\u00a0\u00bb#0a0a0a\u00a0\u00bb color_overlay_2=\u00a0\u00bb#C02020&Prime; 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background_hover_color_opacity=\u00a0\u00bb1&Prime; column_backdrop_filter=\u00a0\u00bbnone\u00a0\u00bb column_shadow=\u00a0\u00bbnone\u00a0\u00bb column_border_radius=\u00a0\u00bbnone\u00a0\u00bb column_link_target=\u00a0\u00bb_self\u00a0\u00bb overflow=\u00a0\u00bbvisible\u00a0\u00bb gradient_direction=\u00a0\u00bbleft_to_right\u00a0\u00bb overlay_strength=\u00a0\u00bb0.3&Prime; width=\u00a0\u00bb1\/1&Prime; tablet_width_inherit=\u00a0\u00bbdefault\u00a0\u00bb animation_type=\u00a0\u00bbdefault\u00a0\u00bb bg_image_animation=\u00a0\u00bbnone\u00a0\u00bb border_type=\u00a0\u00bbsimple\u00a0\u00bb column_border_width=\u00a0\u00bbnone\u00a0\u00bb column_border_style=\u00a0\u00bbsolid\u00a0\u00bb column_padding_type=\u00a0\u00bbdefault\u00a0\u00bb gradient_type=\u00a0\u00bbdefault\u00a0\u00bb][vc_column_text css=\u00a0\u00bb\u00a0\u00bb text_direction=\u00a0\u00bbdefault\u00a0\u00bb]<strong>FERRYBOX<\/strong><\/p>\n<div>\n<p>Dans le cadre du projet europ\u00e9en FerryBox, de grandes quantit\u00e9s de donn\u00e9es oc\u00e9anographiques sont acquises op\u00e9rationnellement sur une p\u00e9riode d&rsquo;au moins un an. G\u00e9n\u00e9ralement, ces donn\u00e9es repr\u00e9sentent des mesures en cours d&rsquo;ex\u00e9cution effectu\u00e9es par des syst\u00e8mes de mesure automatiques install\u00e9s sur des ferrys sur neuf itin\u00e9raires diff\u00e9rents. Les syst\u00e8mes d&rsquo;acquisition de donn\u00e9es sont exploit\u00e9s conjointement ou individuellement par les partenaires du projet concern\u00e9s afin de recueillir une s\u00e9rie de param\u00e8tres oc\u00e9anographiques.<span class=\"Apple-converted-space\">\u00a0<\/span><\/p>\n<p>Les donn\u00e9es des param\u00e8tres de l&rsquo;eau de surface recueillies par la Ferrybox \u00e0 bord du navire Pers\u00e9v\u00e9rance offrent un aper\u00e7u de la qualit\u00e9 et des caract\u00e9ristiques physico-chimiques de l\u2019eau environnante. Ces informations sont utiles pour comprendre les conditions environnementales et les processus biologiques en cours.<span class=\"Apple-converted-space\">\u00a0<\/span><\/p>\n<p><b>La temp\u00e9rature (<\/b><b><i>capteur SBE38<\/i><\/b><b>) et la salinit\u00e9 (<\/b><b><i>capteur SBE45<\/i><\/b><b>) <\/b>sont parmi les premiers indicateurs analys\u00e9s. Elles donnent une id\u00e9e de la structure thermohaline de l&rsquo;eau, qui influence directement la distribution des esp\u00e8ces marines et les courants oc\u00e9aniques. Des variations significatives dans ces param\u00e8tres peuvent indiquer des changements saisonniers ou des ph\u00e9nom\u00e8nes tels que les upwellings, qui peuvent avoir un impact sur la productivit\u00e9 biologique.<span class=\"Apple-converted-space\">\u00a0<\/span><\/p>\n<\/div>\n<div><\/div>\n[\/vc_column_text][vc_column_text css=\u00a0\u00bb\u00a0\u00bb text_direction=\u00a0\u00bbdefault\u00a0\u00bb]<b><img loading=\"lazy\" decoding=\"async\" class=\"alignleft wp-image-8818 \" src=\"https:\/\/www.polarpod.fr\/wp-content\/uploads\/2026\/02\/FERRYBOX-794x1024.png\" alt=\"\" width=\"397\" height=\"512\" srcset=\"https:\/\/www.polarpod.fr\/wp-content\/uploads\/2026\/02\/FERRYBOX-794x1024.png 794w, https:\/\/www.polarpod.fr\/wp-content\/uploads\/2026\/02\/FERRYBOX-232x300.png 232w, https:\/\/www.polarpod.fr\/wp-content\/uploads\/2026\/02\/FERRYBOX-768x991.png 768w, https:\/\/www.polarpod.fr\/wp-content\/uploads\/2026\/02\/FERRYBOX.png 861w\" sizes=\"auto, (max-width: 397px) 100vw, 397px\" \/>Le dioxyg\u00e8ne dissous <\/b>(O2, <i>Aanderaa Optode type 4835<\/i>) est un autre param\u00e8tre important. L\u2019O2 est vital pour la vie, influenc\u00e9 par des facteurs comme la temp\u00e9rature, la salinit\u00e9 et les interactions terre-mer. Sa concentration dans l&rsquo;eau de mer est le r\u00e9sultat d&rsquo;\u00e9changes oc\u00e9an-atmosph\u00e8re, de diffusions et de processus biologiques et chimiques tels que la photosynth\u00e8se et la respiration des organismes aquatiques.<span class=\"Apple-converted-space\">\u00a0<\/span><\/p>\n<p><b>L&rsquo;acidit\u00e9, mesur\u00e9e par le pH <\/b>(<i>ANB sensor<\/i>), est un indicateur de l&rsquo;\u00e9quilibre chimique de l&rsquo;eau. Un pH de 8 est optimal pour la plupart des organismes marins. Des variations du pH peuvent \u00eatre le r\u00e9sultat de processus naturels ou de facteurs anthropiques tels que la pollution.<span class=\"Apple-converted-space\">\u00a0<\/span><\/p>\n<p><b>La fluorescence<\/b>, qui mesure la concentration de chlorophylle, est un indicateur de la productivit\u00e9 biologique de l&rsquo;eau. La chlorophylle est le pigment responsable de la photosynth\u00e8se chez les plantes et le phytoplancton. Une augmentation de la fluorescence peut indiquer une prolif\u00e9ration de phytoplancton, ce qui est b\u00e9n\u00e9fique pour la cha\u00eene alimentaire marine.<span class=\"Apple-converted-space\">\u00a0<\/span><\/p>\n<p><b>La turbidit\u00e9 <\/b>est un param\u00e8tre qui mesure la clart\u00e9 de l&rsquo;eau, influenc\u00e9e par la pr\u00e9sence de particules en suspension. Une haute turbidit\u00e9 peut \u00eatre le signe de s\u00e9diments en suspension ou de mati\u00e8res organiques, ce qui peut affecter la transparence de l&rsquo;eau et la p\u00e9n\u00e9tration de la lumi\u00e8re, impactant ainsi la photosynth\u00e8se marine.<span class=\"Apple-converted-space\">\u00a0<\/span><\/p>\n<p>Enfin, <b>le CO<\/b><b>2 <\/b><b>dissous, ou pCO<\/b><b>2<\/b>, est un indicateur important du cycle du carbone dans les oc\u00e9ans. Il joue un r\u00f4le crucial dans la r\u00e9gulation du climat \u00e0 l&rsquo;\u00e9chelle globale et peut \u00eatre influenc\u00e9 par des processus tels que la photosynth\u00e8se, la respiration et les \u00e9changes avec l&rsquo;atmosph\u00e8re.<span class=\"Apple-converted-space\">\u00a0<\/span>[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][\/vc_column][\/vc_row][vc_row type=\u00a0\u00bbin_container\u00a0\u00bb full_screen_row_position=\u00a0\u00bbmiddle\u00a0\u00bb column_margin=\u00a0\u00bbdefault\u00a0\u00bb column_direction=\u00a0\u00bbdefault\u00a0\u00bb column_direction_tablet=\u00a0\u00bbdefault\u00a0\u00bb column_direction_phone=\u00a0\u00bbdefault\u00a0\u00bb scene_position=\u00a0\u00bbcenter\u00a0\u00bb text_color=\u00a0\u00bbdark\u00a0\u00bb text_align=\u00a0\u00bbleft\u00a0\u00bb row_border_radius=\u00a0\u00bbnone\u00a0\u00bb row_border_radius_applies=\u00a0\u00bbbg\u00a0\u00bb overflow=\u00a0\u00bbvisible\u00a0\u00bb overlay_strength=\u00a0\u00bb0.3&Prime; gradient_direction=\u00a0\u00bbleft_to_right\u00a0\u00bb shape_divider_position=\u00a0\u00bbbottom\u00a0\u00bb bg_image_animation=\u00a0\u00bbnone\u00a0\u00bb][vc_column column_padding=\u00a0\u00bbno-extra-padding\u00a0\u00bb column_padding_tablet=\u00a0\u00bbinherit\u00a0\u00bb column_padding_phone=\u00a0\u00bbinherit\u00a0\u00bb column_padding_position=\u00a0\u00bball\u00a0\u00bb column_element_direction_desktop=\u00a0\u00bbdefault\u00a0\u00bb column_element_spacing=\u00a0\u00bbdefault\u00a0\u00bb desktop_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb tablet_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb phone_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb background_color_opacity=\u00a0\u00bb1&Prime; 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