AICE Marine Science Paper 2 Practice Exam

As water moves toward the equator in the ocean conveyor belt, it absorbs heat from the sun, causing it to warm up. This warming process results in a decrease in water density because warmer water is less dense than cooler water. This is a crucial factor in ocean circulation, as the movement of warm, less dense water helps to drive the global conveyor belt system, influencing climate and weather patterns around the world. The significant heat absorption at the equator contributes to the thermohaline circulation, as the warm surface waters eventually cooler and denser water, further assisting in maintaining ocean currents.

Water losing salinity and sinking, evaporating to increase salinity, or cooling and becoming more dense does not accurately describe the behavior of water as it flows toward the equator. Instead, it’s the warming of the water that is a key characteristic of this process.