noun
oceanographer
A scientist who studies the ocean, including its physical, chemical, biological, and geological aspects.
彼女は海洋学者として深海の研究をしている。
She researches the deep sea as an oceanographer.
海洋学 is the field of oceanography, while 海洋学者 refers to a person who studies it.
Compound of 海洋 (ocean) + 学者 (scholar, researcher).