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Video on "Changes in the Ocean Current"

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Changes in the Ocean.

Climate change warms the ocean, causing knock-on effects such as thermal expansion - which leads to a rise in sea level - and changes in ocean currents. The melting of ice both on land and in the sea also affects the ocean, causing more sea-level rise and reducing the salinity of the ocean, respectively. Greater concentrations of carbon dioxide in the atmosphere also mean that more of it dissolves in the ocean, leading to acidification.
Each of these changes affect marine wildlife. Warming ocean temperatures can lead to coral bleaching - the sudden die-off of large parts of coral reefs - as well as cause animals such as fish to seek cooler waters, shifting their habitats north. This can have a knock-on impact on human communities that rely on those fish for food.

Sea level rise:

Climate change is warming the ocean, causing sea level rise, ocean acidification, and changes in ocean currents. These changes impact marine life and coastal communities.

Warming ocean temperatures

As the ocean warms, it expands and takes up more space. Melting glaciers and ice sheets also add freshwater to the ocean. Warming water can make it less likely to sink, which can slow or stop ocean currents.   Warmer water can cause coral reefs to die, which can impact the food supply for humans.   

Changes in ocean currents : Ocean acidification

Carbon dioxide from the air dissolves into the ocean, making it more acidic.  This can harm organisms with shells made of calcium carbonate, like corals, oysters, and mussels.  

Other impacts

Marine heatwaves have become more frequent and intense, killing native species.
Changes in ocean currents can affect food webs and ecosystem dynamics.
Rising sea levels can lead to flooding, erosion, and landslides.