noun which may take the genitive case particle 'no'
marine; maritime; oceanic
Used as a no-adjective to describe something related to the sea or ocean, often in scientific or technical contexts.
海洋性気候は、年間を通じて気温の変化が小さい。
An oceanic climate has small temperature changes throughout the year.
noun
oceanity
A technical noun referring to the degree or quality of being oceanic; rare outside specialized literature.
この地域の海洋性は、気候データから明らかだ。
The oceanity of this region is clear from the climate data.