An area of seawater intrusion on Tierra Bomba Island in Colombia
AFP
AFP on March 22 quoted the latest analysis led by the US National Aeronautics and Space Administration (NASA) showing that the average global sea level will rise by about 0.76 cm from 2022 to 2023, nearly 4 times higher than the increase in the previous year.
The results are based on more than 30 years of satellite observations, with the first satellite launched in 1992 and the latest satellite launched in 2020. Overall, sea levels have risen 10.16 cm since 1993, with the rate of increase accelerating.
“The current rate of increase means we are on track to add 20 centimeters to the global average sea level by 2050,” said Nadya Vinogradova Shiffer, director of NASA's sea level change and physical oceanography program.
That means the rate of change over the next three decades is double that over the past century, with the prospect of floods becoming more frequent and catastrophic than today.
The immediate cause of the spike is the El Nino weather phenomenon that replaced La Nina from 2021 to 2022. El Nino involves warmer-than-average ocean temperatures in the equatorial Pacific region.
"During El Niño years, much of the rain that would normally fall on land ends up in the ocean, causing temporary sea level rises," said NASA sea level expert Josh Willis.
However, there is also a clear human impact on the trend of faster sea level rise.
"Long-term datasets like this 30-year satellite record allow us to distinguish between short-term impacts on sea level, like El Nino, and long-term trends," said Ben Hamlington, head of the sea level change team at NASA.
Technological innovations have brought greater accuracy to measurements over the years. For example, radar altimeters reflect microwaves from the sea surface, then record the time the signal travels back to the satellite, as well as the strength of the reflected signal.
The experts also cross-checked their data with other sources such as tide gauges, satellite measurements of atmospheric water vapor and Earth's gravity./.
Khanh An (According to Thanh Nien)
Source: https://thanhnien.vn/nasa-canh-bao-muc-nuoc-bien-dang-qua-nhanh-do-el-nino-va-khi-hau-nong-buc-185240322083522652.htm
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