Melting Ice Caps: Coastal cities DOOMED as Antarctica thaws RAPIDLY

Mindy Sparks
June 15, 2018

According to the reports of the study, between the year 1992 and the year 2017, the loss of ice in the area, caused a worldwide rise in sea level by about 7.6 millimeters.

These "tell us about changes in the earth's gravitational attraction over time and that can be related to the mass of the ice sheets overall", Shepherd says, "and they are really powerful measurements because they can add up everything across Antarctica". Between 1992 and 2017 we have observed a threefold increase in the rate of ice loss from West Antarctica, from 53 to 159 billion tonnes a year. They include Antarctic glaciers speeding up in the wake of ice shelf collapse, warming waters in the Amundsen sea-which lies to the west of the continent-and reduced ice sheet growth in East Antarctica. This is the most complete picture of Antarctic ice sheet change to date - 84 scientists from 44 global organizations combined 24 satellite surveys to produce the assessment.

As atmospheric temperatures are expected to rise in the coming decades and centuries, more surface meltwater will be available on fractured ice shelves, which could result in many more catastrophic ice loss events, according to the study.

"We can not count on East Antarctica to be the quiet player, and we start to observe change there in some sectors that have potential and they're vulnerable, " said Velicogna. By mapping our measured sea level contribution on top of these projections, we found that our previous assessment of Antarctic sea level contribution, which measured ice loss until 2012, was tracking the IPCC's lowest projection. It's located in one of the world's safest and most economically vibrant communities and is Orange County's second-largest employer, contributing $5 billion annually to the local economy.

Twila Moon, a research scientist at the National Snow and Ice Data Center who wasn't part of the studies, said "ice-speaking, the situation is dire".

The Atlantic noted this week that millions of people on the U.S. East Coast could be displaced from their homes by the end of the century because of melting in parts of western Antarctica ― which scientists have identified as being the source of most of the recent melting. "We're saying that the terrestrial segment of the ice sheet is more resilient at current carbon-dioxide levels".

In West Antarctica, ice shelves are being eaten away by warm ocean water, and those in the Amundsen and Bellingshausen seas have thinned by as much as 18 percent since the early 1990s.

The measurements are vital information for the almost eight billion of us who don't live on Antarctica, because they allow scientists to compute sea level rise rates and contributions. "Regional sea ice loss impacts the temperature and circulation of the ocean, as well as marine productivity".

The researchers relied on samples taken as part of the worldwide ANtarctic geological DRILLing (ANDRILL) project.

Such a rise alone sounds little but would make coastal floods during storms at high tides more damaging, he said.

"We should be anxious", said University of California Irvine's Isabella Velicogna, one of 88 co-authors. But in the period between 2012 to 2017, the figure jumps to a staggering 219 billion tonnes per year.

The study also helps clear up some uncertainty that was linked to regional differences in Antarctica.

The surveys also demonstrated that similar basal channel-driven transverse fractures occur elsewhere in Greenland and Antarctica.

Ice losses from Antarctica have tripled since 2012, increasing global sea levels by 0.12 inch (3 millimeters) in that timeframe alone, according to a major new worldwide climate assessment funded by NASA and ESA (European Space Agency). This has allowed the scientists to provide one of the most complete pictures of how the continent is changing and contributing to the worldwide rises in sea level. "There are no other plausible signals to be driving this other than climate change".

Other reports by Iphone Fresh

Discuss This Article