Why sea levels aren’t rising at the same rate globally
Explainer: Why sea levels aren’t rising at the same rate globally, A spinning planet, melting ice sheets and warmer waters all contribute to sea level rise, Science news for Students, KATY DAIGLE, CAROLYN GRAMLING, JAN 10, 2019 The sea is coming for the land. In the 20th century, ocean levels rose by a global average of about 14 centimeters (some 5.5 inches). Most of that came from warming water and melting ice. But the water didn’t rise the same amount everywhere. Some coastal areas saw more sea level rise than others. Here’s why:
Swelling seawater As water heats up, its molecules spread out. That means warmer water takes up slightly more space. It’s just a tiny bit per water molecule. But over an ocean, it’s enough to bump up global sea levels……..
Land a-rising Heavy ice sheets — glaciers — covered much of the Northern Hemisphere about 20,000 years ago. The weight of all that ice compressed the land beneath it in areas such as the northeastern United States. Now that this ice is gone, the land has been slowly rebounding to its former height. So in those areas, because the land is rising, sea levels appear to be rising more slowly.
But regions that once lay at the edges of the ice sheets are sinking. ……..
Land a-falling, Earthquakes can make land levels rise and fall…….
Glaciers begone Melting glaciers also can add water to the oceans. But these huge ice slabs affect sea levels in other ways, too.
Huge glaciers can exert a gravitational tug on nearby coastal waters. ……. https://www.sciencenewsforstudents.org/article/explainer-why-sea-level-rise-rate-varies-globally
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