AtlantOS WP7 is dedicated to improve harmonization of data management procedures, and thereby improve the quality, interoperability and discoverability of data resources in AtlantOS. To improve harmonization, AtlantOS WP7 works on multiple levels; a) WP7 has identified selected areas, where significant improvements of interoperability can be obtained. This has resulted in the formulation of a common agreement stating a set of specific minimum standards, which shall ensure cross platform coherence. This includes minimum standards for use of identifiers for platforms and institutions, metadata including vocabularies, quality control and dissemination means. Furthermore, guidelines regarding DOI assignment, catalogue techniques and vocabulary use in AtlantOS have been formulated. b) AtlantOS has formulated and installed a Data Management Plan (DMP) setting the framework for handling and dissemination of AtlantOS data. This was the first step towards improved harmonization and includes an overview of the Data Landscape, prioritization of Essential Variables for AtlantOS, regulations regarding open access to data and recommendations on use of standards. c) AtlantOS WP7 is initiating investigations of the use of GEOSS services, both for technical broker solutions to improve harmonization as well as for dissemination of AtlantOS data resources in an interdisciplinary global context. d) AtlantOS is also working on improving the transcontinental data sharing. A workshop is planned for in 2017 specifically targeting improvement of transcontinental sharing of data from the Atlantic Ocean. We here present the preliminary incentives for improving the transatlantic collaboration.