Washington [US], March 22: On March 22, AFP cited the latest analysis led by the US Aeronautics and Space Administration ( NASA ) showing that the average global sea level will increase by about 0.76 cm from 2022 to 2023, nearly 0.76 cm higher. 4 times the increase in the previous year.
The results are based on more than 30 years of satellite observations, with the first satellite launch in 1992 and the latest satellite launch in 2020. Overall, sea level has increased 10.16 cm since since 1993, with an increasingly rapid growth rate.
"The current rate of increase means we are on track to increase the global mean sea level by 20 centimeters by 2050," said Nadya Vinogradova Shiffer, program director for sea level change and physics. NASA's oceanography.
That figure means the rate of change over the next three decades is double that of the past century, with the prospect of floods becoming more frequent and catastrophic than today.
The direct cause of the spike is the El Nino weather phenomenon replacing La Nina from 2021 to 2022. El Nino is associated with warmer-than-average ocean temperatures in the equatorial region of the Pacific region.
"During years with the El Nino phenomenon, most of the rain that normally falls on land will flow into the ocean, causing sea levels to temporarily rise," according to NASA sea level expert Josh Willis.
However, there is also a clear human impact in the trend toward faster sea level rise.
"Long-term datasets such as these 30 years of satellite data allow us to distinguish between short-term impacts on sea level, such as El Nino, and longer-term trends," said Ben Hamlington leader of the research team on sea level change at NASA stated.
Technological innovations have brought greater precision to measurement over the years. For example, a radar altimeter reflects microwaves from the sea surface, then records the time it takes for the signal to travel back to the satellite, as well as the strength of the returned signal.
Experts also cross-checked their data with other sources such as tide gauges, satellite measurements of atmospheric water vapor and Earth's gravity.
Source: Thanh Nien Newspaper
