The Mercator-Ocean Scientific Newsletter is being published electronically 4 times a year, on January, April, July and October 1st. Its purpose is to provide a periodical forum for the circulation of ideas and research results among the operational oceanography community. It is a scientific journal addressing specialists on the covered topic. It is dedicated to operational oceanography and its latest challenges and progress. you could get more information at http://www.mercator-ocean.fr/eng/actualites-agenda/newsletter/newsletter-Newsletter-52-Special-Issue-jointly-coordinated-by-Mercator-Ocean-and-Coriolis-focusing-on-Ocean-Observations  and download the newsletter here