Satellites show warming is accelerating sea level rise
By SETH BORENSTEIN, AP SCIENCE WRITER WASHINGTON — Feb 12, 2018, 4:35 PM ET

New satellite research shows that global warming is making seas rise at an ever increasing rate. Scientists say melting ice sheets in Greenland and Antarctica is speeding up sea level rise so that by the year 2100 on average oceans will be two feet higher than today, probably even more.

Melting ice sheets in Greenland and Antarctica are speeding up the already fast pace of sea level rise, new satellite research shows.

At the current rate, the world's oceans on average will be at least 2 feet (61 centimeters) higher by the end of the century compared to today, according to researchers who published in Monday's Proceedings of the National Academies of Sciences.

Sea level rise is caused by warming of the ocean and melting from glaciers and ice sheets. The research, based on 25 years of satellite data, shows that pace has quickened, mainly from the melting of massive ice sheets. It confirms scientists' computer simulations and is in line with predictions from the United Nations, which releases regular climate change reports.

"It's a big deal" because the projected sea level rise is a conservative estimate and it is likely to be higher, said lead author Steve Nerem of the University of Colorado.

Outside scientists said even small changes in sea levels can lead to flooding and erosion.

"Any flooding concerns that coastal communities have for 2100 may occur over the next few decades," Oregon State University coastal flooding expert Katy Serafin said in an email.

Of the 3 inches (7.5 centimeters) of sea level rise in the past quarter century, about 55 percent is from warmer water expanding, and the rest is from melting ice.

But the process is accelerating, and more than three-quarters of that acceleration since 1993 is due to melting ice sheets in Greenland and Antarctica, the study shows.

Like weather and climate, there are two factors in sea level rise: year-to-year small rises and falls that are caused by natural events and larger long-term rising trends that are linked to man-made climate change. Nerem's team removed the natural effects of the 1991 Mt. Pinatubo eruption that temporarily chilled Earth and the climate phenomena El Nino and La Nina, and found the accelerating trend.

Sea level rise, more than temperature, is a better gauge of climate change in action, said Anny Cazenave, director of Earth science at the International Space Science Institute in France, who edited the study. Cazenave is one of the pioneers of space-based sea level research.

Global sea levels were stable for about 3,000 years until the 20th century when they rose and then accelerated due to global warming caused by the burning of coal, oil and natural gas, said climate scientist Stefan Rahmstorf of the Potsdam Institute in Germany, who wasn't part of the study.

Two feet of sea level rise by the end of the century "would have big effects on places like Miami and New Orleans, but I don't still view that as catastrophic" because those cities can survive — at great expense — that amount of rising seas under normal situations, Nerem said.

But when a storm hits like 2012's Superstorm Sandy, sea level rise on top of storm surge can lead to record-setting damages, researchers said.

Some scientists at the American Geophysical Union meeting last year said Antarctica may be melting faster than predicted by Monday's study.

Greenland has caused three times more sea level rise than Antarctica so far, but ice melt on the southern continent is responsible for more of the acceleration.

"Antarctica seems less stable than we thought a few years ago," Rutgers climate scientist Robert Kopp said.

Why show a pic of flooding caused by normal weather?

Are you trying to scare everyone Al Gore style?

Why show a pic of flooding caused by normal weather?

Are you trying to scare everyone Al Gore style?

Gordon wrote on Feb 13^th, 2018 at 9:56pm:


You don't scare easy. Is your confidence because you're wearing a super-sized diaper?

Unforgiven wrote on Feb 13^th, 2018 at 11:30pm:


Wow. An article about SLR from 25 years of satellite data and he has fled back to ocean warming calculations.

Now tell me, accurately, the average temperature of the ocean. I presume you are not going to use a spot temperature.

Remembering they used to use buckets, which cooled. The used to use engine intakes, which warmed.

Why do you think they use Estimated Sea Level Rise?

They lacked the computational expertise of denizen lee?

Climate models generally do a poor job of capturing how rising temperatures in the Arctic are affecting sea ice. Most underestimate the rapid pace at which sea ice is diminishing.

Why is that?

Scientists at the massive science conference hosted by the American Geophysical Union (AGU) taking place now in San Francisco have been discussing why it is so difficult to capture what’s happening to Arctic sea ice in climate models, and how we can make the most reliable forecasts possible with the tools available.

A policy-making tool

Arctic sea ice extent has been declining by about four per cent per decade, with the seasonal low at the end of summer shrinking particularly quickly...