What are good oceanographic journals

When searching for a place to publish Earth Science stuff, have a look at the two big continental scientific societies: the American Geophysical Union (AGU) and the European Geosciences Union (EGU). Both have a wide array of publications in the various fields of geosciences. AGU has JGR Oceans, while EGU has Ocean Science (open access). If you want to reach a broader, less specialized audience, you could also aim for Frontiers in Earth Science (open access): they have a Hydrosphere section.