chemical oceanography; marine chemistry
Academic field studying the chemistry of the ocean, including composition, reactions, and cycles.
Chemical oceanography is the study of seawater composition and chemical reactions.
Oceanography in general; 海洋化学 is a subfield focusing on chemistry.
Chemistry as a broad science; 海洋化学 applies it to the ocean.
Compound of 海洋 (ocean) and 化学 (chemistry).