My watch list
my.chemeurope.com  
Login  

Is the ice in Greenland in growing decline?

Accelerated loss of ice mass could be 'ice shield weather'

© I.Sasgen, GFZ

Floating icebergs from Greenland’s largest glacier, Jakobshavn Isbrae. The smooth side indicates part of the iceberg that has already tipped over as sub-marine melting brought it out of balance.

© GFZ

Floating icebergs from Greenland’s largest glacier, Jakobshavn Isbrae. The smooth side indicates part of the iceberg that has already tipped over as sub-marine melting brought it out of balance.

16-07-2013: The time period of satellite observations of the ice sheets of Greenland and the Antarctic is still too short to be able to say whether the accelerated loss of ice measured today will persist in the future. This is the result published today in the online edition of "Nature Geosciences" by a research team led by Bert Wouters from the University of Bristol. The GFZ German Research Centre for Geosciences is also involved in the study. The researchers conclude that predictions of the contribution of both ice shields to the sea level up to the year 2100 may be more than 35 cm too high or too low.

The researchers analyzed nine years' worth of data from the gravity field satellite GRACE. The GRACE measurements showed that both ice sheets are losing significant amounts of ice - about 300 billion tons per year. At the same time, the rate at with which these losses occur is increasing: The contribution of both ice shields to sea level rise in recent years has almost doubled when compared to the first years of the GRACE mission. The causes of this accelerated reduction in ice mass are still a challenge for scientists: In addition to anthropogenic warming, the ice sheets are influenced by a variety of natural processes, such as variations in snowfall and slow changes in ocean currents.

In climatological terms, nine years are a very short period of observation. "It would be more prudent to speak of weather rather than climate," says Bert Wouters. "This 'ice sheet weather' can cloak long-term acceleration, or suggest an increase in the depletion of ice mass that could actually be compensated over a longer period", adds co-author Ingo Sasgen from GFZ. "The results highlight the need for a continuous monitoring of the ice sheets with satellites." In particular, deriving long-term trends of processes that interact with the climate from short observation data sets only have limited meaning. In order to improve the identification and prediction of the contribution of melting ice sheets to future sea level rise, the observation will be continued with the GRACE-Follow On mission from 2017 onwards.

Original publication:
B. Wouters, J.L. Bamber, M.R. van den Broeke, J.T.M. Lenaerts and I. Sasgen, „Limits in detecting acceleration of ice sheet mass loss due to climate variability", Advance Online Publication, Nature Geoscience

Helmholtz-Zentrum Potsdam - Deutsches GeoForschungsZentrum GFZ Stiftung des Öffentlichen Rechts des Landes Brandenburg

Request information now

Recommend news PDF version / Print Add news to watchlist

Share on

Facts, background information, dossiers
  • University of Bristol
More about GFZ
  • News

    Is the ice in Greenland in growing decline?

    The time period of satellite observations of the ice sheets of Greenland and the Antarctic is still too short to be able to say whether the accelerated loss of ice measured today will persist in the future. This is the result published today in the online edition of "Nature Geosciences" by ... more

Your browser is not current. Microsoft Internet Explorer 6.0 does not support some functions on Chemie.DE