极地海洋与全球气候
Polar Oceans and World Climate
了解极地海洋如何与全球气候系统相连——寒冷、密度大的极地海水下沉，驱动温盐环流（全球海洋洋流的“传送带”）；海冰将阳光反射回太空（反照率效应），帮助调节地球温度；南极洲周围的南大洋因上升流带来养分，是地球上最多产的海洋生态系统之一。
Understand how polar oceans connect to the global climate system — cold, dense polar water sinks and drives thermohaline circulation (a global conveyor belt of ocean currents), sea ice reflects sunlight back to space (the albedo effect) helping regulate Earth's temperature, and the Southern Ocean around Antarctica is one of the most productive marine ecosystems on Earth due to upwelling nutrients
学习证据 / Evidence
- 解释寒冷、密度大的极地海水下沉，驱动全球海洋环流（温盐环流）
- 描述反照率效应：白色海冰将阳光反射回太空，而深色海洋吸收热量
- 说明南大洋生产力极高，因为上升流将养分带到海洋表层
- Explain that cold, dense polar water sinks and drives global ocean circulation (thermohaline circulation)
- Describe the albedo effect: white ice reflects sunlight back to space, while dark ocean absorbs heat
- State that the Southern Ocean is extremely productive because upwelling brings nutrients to the surface
评估问题 / Assessment
{{name}}能否解释寒冷的海水下沉如何驱动全球洋流的“传送带”，以及白色海冰如何反射阳光以帮助地球保持凉爽？
Can {{name}} explain how cold polar water sinks and drives a global conveyor belt of ocean currents, and how white sea ice reflects sunlight to help keep the planet cool?