La poussière du Sahara déferlera de nouveau sur la France

20 Février, 2021, 15:50 | Auteur: Auguste Feret
  • Samedi 6 février le ciel s’était coloré de jaune. Ici le port de Thonon-les Bains en Haute-Savoie

Un ciel orangé avait recouvert une partie du sud de la France, ramenant du sable du Sahara jusqu'à Lyon ou Grenoble.

Selon le service européen de surveillance de l'atmosphère Copernicus, un nuage de poussières sahariennes va survoler l'Europe. Une grande partie Sud de la France pourrait être touchée par le phénomène.

Le premier week-end de février, le ciel s'était teinté de jaune ocre, en particulier sur le sud et l'est de la France lors du passage d'un nuage de poussières issues de tempêtes de sable en Algérie, emportées par des vents remontant vers le Nord. Cet épisode a entraîné une dégradation significative de la qualité de l'air dans les régions survolées.

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De nouvelles remontées de sable du Sahara sont attendues sur l'Hexagone à partir de la fin du week-end et jusqu'en début de semaine prochaine. Cette fois-ci, le plus gros du nuage devrait se concentrer sur l'est de l'Espagne et le nord de la France et pourrait aller jusqu'en Norvège.

Les prévisions montrent un panache épais avec une forte profondeur optique des aérosols (AOD) ainsi que de fortes concentrations en surface de grosses particules en suspension (PM10), ce qui provoquera probablement une baisse significative de la qualité de l'air dans les régions touchées. "Nous pensons que ce sera également le cas pour l'événement à venir, bien qu'il ne soit pas encore certain dans quelle mesure le panache sera visible à l'oeil nu", a-t-il ajouté.

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