Science, Space and Technology News 2023
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Sentinel-6 Michael Freilich monitors Pacific Ocean sea surface heights to gauge El Niño impacts. While 2023’s event seems less intense than 1997 and 2015, it might still grow stronger. Sentinel-6 Michael Freilich is the latest satellite contributing to a 30-year sea-level record that researchers are using to compare this year’s El Niño with those of the past.Water expands as it warms, so sea levels tend to be higher in places with warmer water. Higher-than-normal sea levels and warmer-than-average ocean temperatures along the equatorial Pacific characterize El Niños. These conditions can then propagate poleward along the western coasts of the Americas.
The maps above show sea levels in the Pacific Ocean during early October of 1997, 2015, and 2023, in the run up to El Niño events. Higher-than-average ocean heights appear red and white, and lower-than-average heights are in blue and purple. Credit: NASA/JPL-CaltechThere have been two extreme El Niño events in the past 30 years: the first from 1997 to 1998 and the second from 2015 to 2016.
By October 1997 and 2015, large areas of the central and eastern Pacific had sea levels more than 7 inches higher than normal. This year, sea levels are about 2 or 3 inches higher than average and over a smaller area compared to the 1997 and 2015 events. Both of the past El Niños reached peak strength in late November or early December, so this year’s event may still intensify.) in Southern California.
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