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Glaciers melting faster than ever

Date:
August 3, 2015
Source:
University of Zurich
Summary:
The World Glacier Monitoring Service has compiled worldwide data on glacier changes for more than 120 years. Together with its National Correspondents in more than 30 countries, the international service just published a new comprehensive analysis of global glacier changes. In this study, observations of the first decade of the 21st century (2001-2010) were compared to all available earlier data from in-situ, air-borne, and satellite-borne observations as well as to reconstructions from pictorial and written sources.
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Rhone Glacier, June 2014. Much of the glacier seen just seven years previous has melted away.
Credit: Simon Oberli

The World Glacier Monitoring Service, domiciled at the University of Zurich, has compiled worldwide data on glacier changes for more than 120 years. Together with its National Correspondents in more than 30 countries, the international service just published a new comprehensive analysis of global glacier changes in the Journal of Glaciology. In this study, observations of the first decade of the 21st century (2001-2010) were compared to all available earlier data from in-situ, air-borne, and satellite-borne observations as well as to reconstructions from pictorial and written sources.

"The observed glaciers currently lose between half a metre and one metre of its ice thickness every year -- this is two to three times more than the corresponding average of the 20th century," explains Michael Zemp, Director of the World Glacier Monitoring Service and lead author of the study. "Exact measurements of this ice loss are reported from a few hundred glaciers only. However, these results are qualitatively confirmed from field and satellite-based observations for tens of thousands of glaciers around the world."

Global glacier decline

According to the international author team, the current rate of glacier melt is without precedence at global scale, at least for the time period observed and probably also for recorded history, as indicated also in reconstructions from written and illustrated documents. In addition, the study shows that the long-term retreat of glacier tongues is a global phenomenon. Intermittent re‐advance periods at regional and decadal scales are normally restricted to a subsample of glaciers and have not come close to achieving the Little Ice Age maximum positions reached between the 16th and 19th century. As such, glacier tongues in Norway have retreated by some kilometres from its maximum extents in the 19th century. The intermittent re-advances of the 1990s were restricted to glaciers in the coastal area and to a few hundred metres.

In addition, the study indicates that the intense ice loss of the past two decades has resulted in a strong imbalance of glaciers in many regions of the world. "These glaciers will suffer further ice loss, even if climate remains stable," explains Michael Zemp.


Story Source:

The above post is reprinted from materials provided by University of Zurich. Note: Materials may be edited for content and length.


Journal Reference:

  1. Michael Zemp, Holger Frey, Isabelle Gärtner-Roer, Samuel U. Nussbaumer, Martin Hoelzle, Frank Paul, Wilfried Haeberli, Florian Denzinger, Andreas P. Ahlstrøm, Brian Anderson, Samjwal Bajracharya, Carlo Baroni, Ludwig N. Braun, Bolívar E. Cáceres, Gino Casassa, Guillermo Cobos, Luzmila R. Dávila, Hugo Delgado Granados, Michael N. Demuth, Lydia Espizua, Andrea Fischer, Koji Fujita, Bogdan Gadek, Ali Ghazanfar, Jon Ove Hagen, Per Holmlund, Neamat Karimi, Zhongqin Li, Mauri Pelto, Pierre Pitte, Victor V. Popovnin, Cesar A. Portocarrero, Rainer Prinz, Chandrashekhar V. Sangewar, Igor Severskiy, Oddur Sigurðsson, Alvaro Soruco, Ryskul Usubaliev, Christian Vincent. Historically unprecedented global glacier decline in the early 21st century. Journal of Glaciology, 2015; 61 (228): 745 DOI: 10.3189/2015JoG15J017

Cite This Page:

University of Zurich. "Glaciers melting faster than ever." ScienceDaily. ScienceDaily, 3 August 2015. <www.sciencedaily.com/releases/2015/08/150803083445.htm>.
University of Zurich. (2015, August 3). Glaciers melting faster than ever. ScienceDaily. Retrieved July 27, 2016 from www.sciencedaily.com/releases/2015/08/150803083445.htm
University of Zurich. "Glaciers melting faster than ever." ScienceDaily. www.sciencedaily.com/releases/2015/08/150803083445.htm (accessed July 27, 2016).

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