Featured Research

from universities, journals, and other organizations

Melting water's lubricating effect on glaciers has only 'minor' role in future sea-level rise

Date:
August 12, 2013
Source:
University of Bristol
Summary:
Concerns that melting water would speed up the decline of Greenland's ice sheet have been allayed by new research which shows the lubricating effect of water beneath glaciers will not significantly add to sea-level rise.

Concerns that melting water would speed up the decline of Greenland's ice sheet have been allayed by new research which shows the lubricating effect of water beneath glaciers will not significantly add to sea-level rise.

Related Articles


Scientists had feared that melt-water which trickles down through the ice could dramatically speed up the movement of glaciers as it acts as a lubricant between the ice and the ground it moves over.

But in a paper published today in PNAS, a team led by scientists from the University of Bristol found it is likely to have a minor role in sea-level rise compared with other effects like iceberg production and surface melt.

The results of computer modelling, based on fieldwork observations in Greenland, revealed that by the year 2200 lubrication would only add a maximum of 8mm to sea-level rise -- less than 5 per cent of the total projected contribution from the Greenland ice sheet.

In fact in some of their simulations the lubricating effect had a negative impact on sea-level rise -- in other words it alone could lead to a lowering of sea-level (ignoring the other major factors).

Lead author, Dr Sarah Shannon from the University of Bristol, said: "This is an important step forward in our understanding of the factors that control sea-level rise from the Greenland Ice Sheet. Our results show that melt-water enhanced lubrication will have a minor contribution to future sea-level rise. Future mass loss will be governed by changes in surface melt-water runoff or iceberg calving."

Previous studies of the effects of melt-water on the speed of ice movement had assumed the water created cavities at the bottom of ice masses. These cavities lifted the ice slightly and acted as a lubricant, speeding up flow.

This theory had led scientists to think that increased melt-water would lead directly to more lubrication and a consequent speeding up of the ice flow.

But the Bristol-led study took into account recent observations that indicate larger amounts of melt-water may form channels beneath the ice that drain the water away, reducing the water's lubricating effect. The scientists found that no matter whether more melt-water increases or decreases the speed of ice flow, the effect on sea level is small.

Dr Shannon said: "We found that the melt-water would lead to a redistribution of the ice, but not necessarily to an increase in flow."

The findings are part of research undertaken through the European funded ice2sea programme. Earlier research from the programme has shown that changes in surface melting of the ice sheet will be the major factor in sea-level rise contributions from Greenland.

Professor David Vaughan, ice2sea co-ordinator based at the British Antarctic Survey in Cambridge, said: "This is important work but it's no reason for complacency. While this work shows that the process of lubrication of ice flow by surface melting is rather insignificant, our projections are still that Greenland will be a major source of future sea-level rise. As we have reported earlier this year, run-off of surface melt water directly into the ocean and increased iceberg calving are likely to dominate."


Story Source:

The above story is based on materials provided by University of Bristol. Note: Materials may be edited for content and length.


Cite This Page:

University of Bristol. "Melting water's lubricating effect on glaciers has only 'minor' role in future sea-level rise." ScienceDaily. ScienceDaily, 12 August 2013. <www.sciencedaily.com/releases/2013/08/130812154409.htm>.
University of Bristol. (2013, August 12). Melting water's lubricating effect on glaciers has only 'minor' role in future sea-level rise. ScienceDaily. Retrieved December 17, 2014 from www.sciencedaily.com/releases/2013/08/130812154409.htm
University of Bristol. "Melting water's lubricating effect on glaciers has only 'minor' role in future sea-level rise." ScienceDaily. www.sciencedaily.com/releases/2013/08/130812154409.htm (accessed December 17, 2014).

Share This


More From ScienceDaily



More Earth & Climate News

Wednesday, December 17, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Ivory Trade Boom Swamps Law Efforts

Ivory Trade Boom Swamps Law Efforts

Reuters - Business Video Online (Dec. 17, 2014) Demand for ivory has claimed the lives of tens of thousands of African elephants and now a conservation report says the illegal trade is overwhelming efforts to enforce the law. Amy Pollock reports. Video provided by Reuters
Powered by NewsLook.com
Indictments in West Virginia Chemical Spill Case

Indictments in West Virginia Chemical Spill Case

AP (Dec. 17, 2014) A grand jury indicted four former executives of Freedom Industries, the company at the center of the Jan. 9, 2014 chemical spill in Charleston, West Virginia. The spill contaminated the Elk River and the water supply of 300,000 people. (Dec. 17) Video provided by AP
Powered by NewsLook.com
Uphill Battle to Tackle Indonesian Shark Fishing

Uphill Battle to Tackle Indonesian Shark Fishing

AFP (Dec. 17, 2014) Sharks are hauled ashore every day at a busy market on the central Indonesian island of Lombok, the hub of a booming trade that provides a livelihood for local fishermen but is increasingly alarming environmentalists. Duration: 00:42 Video provided by AFP
Powered by NewsLook.com
France's Sauternes Wine Threatened by New Train Line

France's Sauternes Wine Threatened by New Train Line

AFP (Dec. 16, 2014) Winemakers in southwestern France's Bordeaux are concerned about a proposed high speed train line that could affect the microclimate required for the region's sweet wine. Duration: 01:06 Video provided by AFP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Plants & Animals

Earth & Climate

Fossils & Ruins

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins