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The Ocean Observers is an international educational network of ocean scientists, teachers and educational authorities, marine communicators, sailing community and other stakeholders who are willing to share marine science educational resources and experiences for exploring the possibilities to establish new international collaborative activities. Marine science popularisation and outreach are becoming more and more important to raise awareness among the communities that a healthy ocean is vital for the wellbeing of generations to come. The existing outreach activities focused on in situ ocean observations are isolated and lack national, European and international visibility. The Ocean Observers network attempts to bring together different actors involved in marine science outreach activities to do a review of the existing ocean observing outreach initiatives, favour discussions and collaboration between people engaged in marine science outreach programmes in link with in situ ocean observations as well as to federate a community around a coordinated project. An international working group was created after the 1 st Ocean Observers educational workshop co-organised by Euro-Argo ERIC and OceanOPS (formerly named JCOMMOPS) in Brest in June 2017, with the aim to coordinate the initiative. As part of the Euro-Argo RISE H2020 European Union project, a second Ocean Observers workshop will be organised by the end of 2021., Les Observateurs de l'océan sont un réseau éducatif international composé de spécialistes des sciences de la mer, d'enseignants et d'autorités éducatives, de communicateurs marins, de la communauté des navigateurs et d'autres parties prenantes qui souhaitent partager leurs ressources éducatives et leurs expériences en matière de sciences de la mer afin d'explorer les possibilités d'établir de nouvelles activités de collaboration internationale. La vulgarisation et la diffusion des sciences marines sont de plus en plus importantes pour sensibiliser les communautés au fait qu'un océan sain est vital pour le bien-être des générations à venir. Les activités de vulgarisation existantes axées sur les observations océaniques in situ sont isolées et manquent de visibilité au niveau national, européen et international. Le réseau des observateurs de l'océan tente de rassembler les différents acteurs impliqués dans les activités de sensibilisation aux sciences marines afin de faire le point sur les initiatives existantes en matière de sensibilisation à l'observation de l'océan, de favoriser les discussions et la collaboration entre les personnes engagées dans des programmes de sensibilisation aux sciences marines en lien avec l'observation in situ de l'océan et de fédérer une communauté autour d'un projet coordonné. Un groupe de travail international a été créé après le 1 er atelier éducatif des observateurs de l'océan co-organisé par Euro-Argo ERIC et OceanOPS (anciennement nommé JCOMMOPS) à Brest en juin 2017, dans le but de coordonner l'initiative. Dans le cadre du projet Euro-Argo RISE H2020 de l'Union européenne, un deuxième atelier Ocean Observers sera organisé d'ici fin 2021

International audience; Argo hydrographic profiles collected from 2004 to 2011 in the southeast Atlantic sector of the Southern Ocean are used in combination with hydrographic transects to describe the characteristics of Antarctic Intermediate Water (AAIW) in the region. Making use of the recently developed ANDRO velocity data set, we estimate the evolution of the dynamical properties of different AAIW varieties along their pathways within the isoneutral layer (27.1 < gn < 27.6). Three different regional varieties of intermediate water converge in the southeast Atlantic: Atlantic AAIW (A-AAIW, characterized by S ≤ 34.2), Indian AAIW (I-AAIW, S ≥ 34.3), and a previously unknown variety that we named Indo-Atlantic intermediate water (IA-AAIW, 34.2 < S < 34.3). South of Africa, the I-AAIW flowing within the Agulhas Current separates into two branches. One branch retroflects following the Agulhas Return Current (13.4 Sv) and proceeds back to the Indian Ocean. The other one separates from the Agulhas Current, and flows into the southeast Atlantic via the Cape Basin within mesoscale eddies (13.5 Sv). A-AAIW enters the domain between the Subtropical Front and the Subantarctic Front (36 Sv). Part of this water (28 Sv) flows eastward into the Indian Ocean, while 10 Sv are injected into the Cape Basin and mix with I-AAIW giving rise to the new IA-AAIW variety. The latter separates into two branches, both transporting 7.4 Sv. One flows northwestward and subducts along the Northern Subtropical Front, while the other moves eastward to contribute a sizable volume of fresh and oxygenated water to the Indian Ocean.