This is the 9036th most frequent Japanese word.
海面
Sea surface.
In this sentence, '海面' (kaimen) is used to denote the surface level of the sea, emphasizing its variation under environmental influence.
海面の高さは気候変動によって変化しています。
The height of the sea surface is changing due to climate change.
Here, '海面' is employed to specify the boundary between the sea and air where the diver emerges.
ダイバーは海面に浮上しました。
The diver surfaced to the sea level.
The term '海面' in this instance refers to the visible reflective surface of the ocean and its aesthetic interaction with sunlight.