Free Newsletters - Space - Defense - Environment - Energy - Solar - Nuclear
..
. Earth Science News .




WATER WORLD
Sea level rise forecasts helped by insights into glacier melting
by Staff Writers
Edinburgh UK (SPX) Nov 28, 2013


File image.

Predictions of sea level rise could become more accurate, thanks to new insight into how glacier movement is affected by melting ice in summer.

Studies of the Greenland ice sheet, including during a record warm summer, are helping scientists better understand how summer conditions affect its flow. This is important for predicting the future contribution made by melting glaciers to sea level rise.

Ice flows slowly from the centre of the Greenland Ice Sheet towards its margins, where it eventually melts or calves into the ocean as icebergs. Knowing how fast this movement occurs is essential for predicting the contribution of the ice sheet to sea level rise.

In summer, ice from the surface of a glacier melts and drains to the bed of the ice sheet, initially raising water pressure at the base and enabling the glacier to slide more quickly. It can, at times, move more than twice as fast in summer compared with winter, they found.

In 2012, an exceptionally warm summer caused the Greenland Ice Sheet to undergo unprecedented rates of melting. However, researchers have found that fast summer ice flow caused by significant melting is cancelled out by slower motion the following winter.

Scientists found that this is because large drainage channels, formed beneath the ice by the meltwater, helped to lower the water pressure, ultimately reducing the sliding speed.

The discovery suggests that movement in the parts of the ice sheet that terminate on land are insensitive to surface melt rates. It improves scientists' understanding of how the ice sheet behaves and curbs error in estimating its contribution to sea level rise in a warming world.

Scientists led by the University of Edinburgh gathered detailed GPS ice flow data and ice surface melt rates along a 115 km transect in west Greenland and compared ice motion from an average melt year, 2009, with the exceptionally warm year of 2012.

The study, carried out in collaboration with the Universities of Sheffield, Aberdeen, Tasmania and Newcastle, was published in Proceedings of the National Academy of Sciences and supported by the Natural Environment Research Council.

Professor Peter Nienow of the University of Edinburgh's School of GeoSciences, who led the study, said: "Although the record summer melt did not intensify ice motion, warmer summers will still lead to more rapid melting of the ice sheet. Furthermore, it is important that we continue to investigate how glaciers that end in the ocean are responding to climate change."

.


Related Links
University of Edinburgh
Water News - Science, Technology and Politics






Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle




Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News





WATER WORLD
Feast and famine on the abyssal plain
Moss Landing, CA (SPX) Nov 13, 2013
Animals living on the abyssal plains, miles below the ocean surface, don't usually get much to eat. Their main source of food is "marine snow"-a slow drift of mucus, fecal pellets, and body parts-that sinks down from the surface waters. However, researchers have long been puzzled by the fact that, over the long term, the steady fall of marine snow cannot account for all the food consumed by anim ... read more


WATER WORLD
Philippines says Super Typhoon Haiyan, other storms curb growth

Mass vaccinations for children in typhoon-hit Philippines

EU to give Haiti $25.1 mln in humanitarian aid

Crucial jobs cleaning up after Philippine typhoon

WATER WORLD
Crippled space telescope given second life, new mission

Scientists create perfect solution to iron out kinks in surfaces

What might recyclable satellites look like?

Overcoming Brittleness: New Insights into Bulk Metallic Glass

WATER WORLD
China desert lake shrinks by one-third in 13 years: Xinhua

Sea level rise forecasts helped by insights into glacier melting

EU threatens six countries with illegal fishing sanctions

Large study shows pollution impact on coral reefs -- and offers solution

WATER WORLD
Russian court frees last Greenpeace activist

Greenland's shrunken ice sheet: We've been here before

IceBridge at McMurdo: A Year and a Half of Planning

WTO backs EU in seal ban battle with Canada and Norway

WATER WORLD
Typhoon-hit Philippine farmers risk 'double tragedy': FAO

Delaying Resistance to Bt Corn in Western Corn Rootworm

Increasing cropping frequency offers opportunity to boost food supply

Coca trade in spotlight as Colombia peace talks resume

WATER WORLD
2013 hurricane season said quietest since 1950

Indian cyclone weakens, 'no danger,' says weather office

18,000 Indonesians flee erupting volcano

Early-career investigator discovers current volcanic activity under West Antarctica

WATER WORLD
Nigeria military says bombed Boko Haram camps

Mozambique police fire tear gas at anti-conscription protest

Chinese businessman charged in Zambia graft case

Somalia troops boosted as al-Shabaab fights on

WATER WORLD
Study suggests inbreeding shaped course of early human evolution

Investments in Aging Biology Research will Pay Longevity Dividend

Research team discovers 'immune gene' in Neanderthals

Ancient, modern DNA tell story of first humans in the Americas




The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA Portal Reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement,agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement