Peter Sinclair in the Midland Daily News:
Dr. Andrea Dutton is an Oceanographer at the University of Wisconsin, and a winner of the MacArthur “Genius award. As I spoke to her about climate driven sea level rise, she illustrated her points with sweeping waves of her arms.
She traced a graceful upward swoop of an imaginary graph, to illustrate the steady rise of oceans in response to global heating – and made a hard point.
“When you look at those graphs, it shows this smooth line going up, which gives you the impression it won’t get to say, 2 feet higher than today, until 2060, for example.”
“But I think that’s a little bit misleading, because in fact, during extreme storms or extreme high tides, you’ll reach 2 feet, but you’ll reach it with increasing frequency, as you approach 2060, till you’re there on average.”
“And so when you look at the projection, it gives you almost this false sense of complacency, that, “we have time, we’re not going to get to 2 feet until 2060”, for example, but in fact, we will get there, much before then, with increasing frequency.
And so using that graph on its own is a little bit dangerous, without understanding what it means.”
At the moment, her words are coming vividly to life in news reports from California, as just such an extreme event is evolving in the Pacific Ocean.
El Niño is a regular cycle occurring every 3 to 7 years, in which the world’s warmest ocean water, that normally pools in the southwest Pacific, around the Philippines and Indonesia, sloshes eastward and piles up for a time against the coasts of the Americas.
This cycle, scientists tell us, is still developing, but may be the most intense El Niño ever in the modern record.
That water, slowly surging against the west coasts of the Americas, being warm, expands, and it’s level rises well above normal, even more so as it presses up against the coasts. The expanding thousand mile lens of water is called a “Kelvin Wave”.
It’s not a wave like we see in pictures of crashing surf, but rather a massive swell, thousands of miles across.
As it presses up against shorelines, it may cause sea level to rise temporarily by as much as a foot or two.





