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Sea level rise rate accelerated by 50%

For sinking cities like New Orleans and Venice, the trend of global warming is even worse. Sea level rise caused by melting icebergs and ocean warming is being monitored by a large number of satellites. Steve Nerem, a geophysicist at the University of Colorado at Boulder, and his colleagues synthesized all the evidence in July and concluded that the sea level is rising 50% faster now than it was decades ago.

The measurement data of sea level height come from two NASA satellites TOPEX/Poseidon and Jason- 1. They survey the ocean every ten days. In the past 12 years, the sea level has risen by an average of one tenth of an inch every year. This speed is much faster than that estimated by tide gauges around the world in the previous 50 years. Nerem said that it is too early to attribute this result to global warming, or it may be due to the periodic changes of marine climate. "It's hard to say whether this phenomenon is a long-term trend or a short-term trend," he said. It may take 10 to 15 years to draw a clear conclusion, but this phenomenon is indeed in line with the computer's prediction of global climate change trends.

Other scientists' calculations show that about half of the sea level rise is caused by ocean warming and thermal expansion, and melting icebergs and polar ice have also accelerated this process. Climatologists also suspect that the ice sheets in Greenland and Antarctica have also been affected, but they are not sure about the extent of the impact. These ice layers are still accelerating towards the ocean. However, this year's study found that part of Antarctica is actually getting thicker. That is to say, according to Richard Avery, a glaciologist at Pennsylvania State University, the impact of ice on sea level is "unclear for the time being". It is essential to understand the behavior of ice. Other scientists in iriver say that the ice in Antarctica and Greenland also contains water that can raise the sea level by more than 200 feet.