[OANNES Foro] A Reconciled Estimate of Glacier Contributions to Sea Level Rise: 2003 to 2009

[Mario Cabrejos]

Science 17 May 2013: 
Vol. 340 no. 6134 pp. 852-857 
DOI: 10.1126/science.1234532 

A Reconciled Estimate of Glacier Contributions to Sea Level Rise: 2003 to 2009
Alex S. Gardner1,2,*, Geir Moholdt3, J. Graham Cogley4, Bert Wouters5,6, Anthony A. Arendt7, John Wahr5,8, Etienne Berthier9, Regine Hock7,10, W. Tad Pfeffer11, Georg Kaser12, Stefan R. M. Ligtenerg13, Tobias Bolch14,15, Martin J. Sharp16, Jon Ove Hagen17, Michiel R. van den Broeke13, Frank Paul14
1Graduate School of Geography, Clark University, Worcester, MA 01610, USA. 2Department of Atmospheric, Oceanic and Space Science, University of Michigan, Ann Arbor, MI 48109, USA. 3Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, La Jolla, CA 92093, USA. 4Department of Geography, Trent University, Peterborough, Ontario K9J 7B8, Canada. 5Department of Physics, University of Colorado at Boulder, Boulder, CO 80309, USA. 6Bristol Glaciology Centre, School of Geographical Science, Bristol BS8 1SS, UK. 7Geophysical Institute, University of Alaska Fairbanks, Fairbanks, AK 99775, USA. 8Cooperative Institute for Research in Environmental Sciences, University of Colorado at Boulder, Boulder, CO 80309, USA. 9Centre National de la Recherche Scientifique, Université de Toulouse, LEGOS, 14 Avenue E. Belin, 31400 Toulouse, France. 10Department of Earth Sciences, Uppsala University, SE-751 05 Uppsala, Sweden. 11Institute of Arctic and Alpine Research, University of Colorado at Boulder, Boulder, CO 80309, USA. 12Institute of Meteorology and Geophysics, Universität Innsbruck, A-6020 Innsbruck, Austria. 13Utrecht University, Institute for Marine and Atmospheric Research Utrecht, 3508 TA Utrecht, Netherlands. 14Department of Geography, University of Zurich, CH-8057 Zurich, Switzerland. 15Institut für Kartographie, Technische Universität Dresden, D-01062 Dresden, Germany. 16Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta T6G 2E3, Canada. 17Department of Geosciences, University of Oslo, Box 1047 Blindern, N-0316, Oslo, Norway. Corresponding author. E-mail: agardner en clarku.edu

Abstract
Glaciers distinct from the Greenland and Antarctic Ice Sheets are losing large amounts of water to the world's oceans. However, estimates of their contribution to sea level rise disagree. We provide a consensus estimate by standardizing existing, and creating new, mass-budget estimates from satellite gravimetry and altimetry and from local glaciological records. In many regions, local measurements are more negative than satellite-based estimates. All regions lost mass during 2003-2009, with the largest losses from Arctic Canada, Alaska, coastal Greenland, the southern Andes, and high-mountain Asia, but there was little loss from glaciers in Antarctica. Over this period, the global mass budget was -259 ± 28 gigatons per year, equivalent to the combined loss from both ice sheets and accounting for 29 ± 13% of the observed sea level rise. 

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Science 17 May 2013: 
Vol. 340 no. 6134 p. 798 
DOI: 10.1126/science.340.6134.798 

Melting Glaciers, Not Just Ice Sheets, Stoking Sea-Level Rise
Richard A. Kerr
Summary
Glaciologists trekking onto remote, inhospitable streams of flowing ice have brought back some especially bad news. But then 21st century monitoring from space began to show a much smaller role for glacial ice loss in sea-level rise. Which to believe? A new study brings together both boots-on-the-ice and high-tech glaciologists, saying that although the field measurements were painting an accurate picture of the few glaciers being monitored, they were not representative of the world's glaciers. All 19 glacierized regions of the world are losing ice, the study finds, but the iconic glaciers long-studied by field glaciologists are disappearing faster than most. Still, the world's glaciers are losing ice just as fast as the great ice sheets. 

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