Our future is intimately linked to the future of the seas, oceans and coasts. They provide multiple resources and ecosystem services, they influence climate and provide many economic opportunities. To fully profit from the seas and oceans in the future, we need to preserve those valuable resources and ensure that their exploitation is sustainable. Computational marine tools are a key factor on the fulfilment of those objectives, explaining why they are recognized as a central piece on UN Decade of Ocean Sciences. After the success of the 2019 edition, MarineComp2020 will focus on the use of computational methods for the simulation of every aspect of the marine environment: currents, waves, pollutant transport, among others, as well as every scale, from local studies in estuaries and coastal systems to global ocean studies. Integrated studies blending different scales and/or processes are encouraged. As the atmospheric system is influenced by and influences the marine environment, coupled atmospheric ocean studies are welcome. Although papers dealing with advancements in numerical algorithms and improvements in computational performance are accepted, we aim specifically at papers advancing the human capacity in dealing with the sustainable development goals as defined by the UN, as well as the human capacity to harvest the economic potential of the ocean, according to the blue growth model. Accepted themes include, but are not limited to:
•    Assimilation of new sensor and data in Marine Modelling, such as low cost sensors, IoT platforms, Low cost drifting buoys, Gliders and AUV, New remote observation platforms, etc.;
•    Downscale and upscale methodologies leading to high resolution and extended coverage modelling systems;
•    Integration of inland, coastal and oceanic modelling systems;
•    Coupled Atmosphere-Ocean models and/or climate change studies;
•    New emerging ocean industries, processes and threats;
•    Marine modelling applications for the end users, such as Apps for citizens, for ocean literacy, specific industry applications, safety and hazard oriented tools among others.