[109] Ocean Current System / 洋流系統, 1999

Green arrows indicate nutrient and oxygen-rich, cold, dense, and high saline currents that usually run in the deeper layers of the oceans. They tend to flow from the poles towards the equator. Red are the warm surface currents that carry tropical waters to the higher latitudes where they release energy to the air. The meeting of cold and warm waters often result in turbulent seas and stormy regions. The major ocean currents are wind-driven currents, though some ocean currents result from density and salinity variations of water.

綠色箭頭標示著通常竄流於海洋深層,富含養份與氧份,並且低溫、密集,且含鹽量高的洋流。這些洋流通常會從極地流向赤道。紅色標示著挾帶著熱帶海水流向高緯度地區之後釋放能量到大氣中的表面暖流。寒冷和溫暖的海水的交匯經常會導致海域紊流與形成暴風雨。大部分的洋流都是風海流,也有些洋流是由水的密度和鹽度變化所引起的。