greenland

New study shows worrisome signs for Greenland ice

“Greenland by itself has enough ice to cause many meters of sea level rise. If you live near the coast, the question of “when” is really important. This paper suggests that “when” may be sooner than we hoped.”

As humans put more heat-trapping gases into the atmosphere, like carbon dioxide, ice around the planet melts. This melting can be a problem, particularly if the melting ice starts its life on land. That’s because the melt water flows into the oceans, contributing to rising sea levels. Right now there are three main reasons that sea levels are rising. First, as ocean waters heat, they expand. Second, melting of ice in Antarctica flows into the ocean. Third, melting of ice on Greenland flows into the ocean. There is other melting, like mountain glaciers, but they are minor factors.

Okay, so how much is melting of Greenland contributing to sea level rise? Estimates are that about 270 gigatons of water per year are melting. The melting of an ice sheet like that atop Greenland can occur from the surface as air temperatures and sunlight warm the upper layer of ice. It can also occur from the edges as ice shelves collapse and fall into the oceans in large chunks.

For ice-shelf collapse, there’s a complex process that occurs at the bottom of the ice. Part of the ice is floating out over water and part of it is grounded on land. Warm water can get underneath the ice, lift it up, and melt the ice from below.

The bedrock underneath the ice sheet is not flat or gradually changing. There are undulations that rise and fall and change the water-ice-ground connection. Topology called “retrograde” can make it easier for ice to melt and can increase the rate of ice shelf collapse. So, scientists have a real interest in learning about the topology of the land underneath ice sheets so they can better predict ice collapse and sea level rise.

This brings us to a new study published by the American Geophysical Union in a journal called Geophysical Letters Review. The scientists use gravitometry to obtain a high-quality picture of the land underneath a very fast moving part of Greenland ice called the Jacobshavn Isbrae. Basically, the scientists flew gravity sensors across the ice at low altitudes and low velocity. These sensors are called accelerometers and they can be used to determine the x, y, and z gravity components. The measurements of the gravity allowed them to attain the local height of the subsurface with greater accuracy than previously known.

…more…

Follow us

We are here to bring the world of ecosocialism to life.

Like Us On Facebook

Facebook Pagelike Widget
What Might An Ecosocialist Society Look Like?
On Sept 19, 2023 ahead of the Climate Ambition Summit in New York City, climate activists gathered for a rally and civil disobedience outside Bank of America Tower in Midtown Manhattan as part of the March to End Fossil Fuels wave of actions resulting in multiple arrests. Activists demand Bank of America to “Defund Climate Chaos and Defend Human Rights” Photo: Erik McGregor (CC BY-NC 2.0 Deed)

Let’s Save Each Other

Let’s Save Each Other

Illustration by Stephanie McMillan. Used with permission