More research is necessary to determine if the cause is global warming or natural variability, an author of the report says.
The weather pattern known as El Niño, which can bring heavy rains to Southern California, has doubled in intensity and warmth and shifted westward over several decades, according to scientists from the Jet Propulsion Laboratory and the National Oceanic and Atmospheric Administration.The findings, published in Geophysical Research Letters, a journal of the American Geophysical Union, measured ocean temperature and analyzed satellite data over the last three decades.
JPL oceanographer Tong Lee, an author of the paper, said in an interview that more research is needed to determine whether the changes in El Niño are due to the documented rise in global air and ocean temperatures worldwide since the Industrial Revolution or to natural variability.
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