Researchers found that average winter wave heights have grown by as much as a foot since 1970, when global warming is believed to have begun accelerating.
When waves ricochet off the shore, they collide with incoming waves and cause a ripple of energy through the seafloor that can be picked up by seismographs designed to detect earthquakes. The greater the impact, the taller the wave is.Sign up for NBC San Diego newsletters.
To go back further, Bromirski gathered a team of undergraduate students to analyze daily seismic readings covering decades of winters. It was a slow, painstaking process that took years and involved digitizing drums of paper records. But he said it was important in learning how things have changed over nearly a century along California's coast.
“Erosion, coastal flooding, damage to coastal infrastructure is, you know, something that we’re seeing more frequently than in the past," Bromirski said. “And, you know, combined with sea level rise, bigger waves mean that is going to happen more often.”“There’s about twice as many big wave events since 1970 as there was prior to 1970,” Bromirski said.
Bromirski said that is a harbinger of the future. Scientists say global warming may even be accelerating, ushering in even bigger waves.
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