A long-term sea level dataset shows ocean surface heights continuing to rise at faster and faster rates over decades of observations.
Sea level rise is affecting coastal communities around the world, especially those like Honolulu, pictured, that are located on islands.rose by about 0.3 inches from 2022 to 2023, a relatively large jump due mostly to a warming climate and the development of a strong El Niño. The total rise is equivalent to draining a quarter of Lake Superior into the ocean over the course of a year.
The data shows that global average sea level has risen a total of about 4 inches since 1993. The rate of this increase has also accelerated, more than doubling from 0.07 inches per year in 1993 to the current rate of 0.17 inches per year. La Niña is characterized by cooler-than-normal ocean temperatures in the equatorial Pacific Ocean. El Niño involves warmer-than-average ocean temperatures in the equatorial Pacific. Both periodic climate phenomena affect patterns of rainfall and snowfall as well as sea levels around the world.
“Long-term datasets like this 30-year satellite record allow us to differentiate between short-term effects on sea level, like El Niño, and trends that let us know where sea level is heading,” said Ben Hamlington, lead for NASA’s sea level change team at JPL.
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