noun
cold water mass
Oceanographic term for a body of cold water within a larger body of water, often used in discussions of currents, upwelling, or climate.
この海域には冷水塊が存在し、漁業に影響を与えている。
A cold water mass exists in this sea area, affecting the fishing industry.
Compound of 冷水 (cold water) and 塊 (mass, lump). The term is a direct calque from English 'cold water mass' used in oceanography.