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Feedbacks and Mechanisms Affecting the Global Sensitivity of Glaciers to Climate Change : Volume 7, Issue 3 (17/06/2013)

By Marzeion, B.

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Book Id: WPLBN0004022860
Format Type: PDF Article :
File Size: Pages 40
Reproduction Date: 2015

Title: Feedbacks and Mechanisms Affecting the Global Sensitivity of Glaciers to Climate Change : Volume 7, Issue 3 (17/06/2013)  
Author: Marzeion, B.
Volume: Vol. 7, Issue 3
Language: English
Subject: Science, Cryosphere, Discussions
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2013
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Gregory, J. M., Jarosch, A. H., & Marzeion, B. (2013). Feedbacks and Mechanisms Affecting the Global Sensitivity of Glaciers to Climate Change : Volume 7, Issue 3 (17/06/2013). Retrieved from http://nook-library.net/


Description
Description: Center of Climate and Cryopshere, Institute of Meteorology and Geophysics, University of Innsbruck, Austria. Mass loss by glaciers has been an important contributor to sea level rise in the past and is projected to contribute a substantial fraction of total sea level rise during the 21st century. Here, we use a model of the world's glaciers in order to quantify equilibrium sensitivities of global glacier mass to climate change, and to investigate the role of changes in glacier hypsometry for long term mass changes. We find that 21st century glacier mass loss to a~large degree is governed by the glaciers responding to 20th century climate change. This limits the influence of 21st century climate change on glacier mass loss, and explains why there are relatively small differences in glacier mass loss under greatly different scenarios of climate change. Because of the geographic distribution of glaciers, both temperature and precipitation anomalies experienced by glaciers are vastly stronger than on global average. The projected increase in precipitation partly compensates for the mass loss caused by warming, but this compensation is negligible at higher temperature anomalies since an increasing fraction of precipitation at the glacier sites it liquid. Loss of low-lying glacier area, and more importantly, eventual complete disappearance of glaciers, strongly limit the projected sea level contribution from glaciers in coming centuries. The adjustment of glacier hypsometry to changes in the forcing reduces the sensitivity of global glacier mass to changes in global mean temperature by a factor of two to three. This result is a second reason for the relatively weak dependence of glacier mass loss on future climate scenario, and helps explain why glacier mass loss in the first half of the 20th century was of the same order of magnitude as in the second half of the 20th century, even though the rate of warming was considerably smaller.

Summary
Feedbacks and mechanisms affecting the global sensitivity of glaciers to climate change

Excerpt
Andrews, T., Forster, P. M., Boucher, O., Bellouin, N., and Jones, A.: Precipitation, radiative forcing and global temperature change, Geophys. Res. Lett., 37, L14701, doi:10.1029/2010GL043991, 2010.; Bahr, D.: Global distributions of glacier properties: a stochastic scaling paradigm, Water Resour. Res., 33, 1669–1679, 1997.; Bahr, D., Meier, M., and Peckham, S.: The physical basis of glacier volume-area scaling, J. Geophys. Res., 102, 355–362, 1997.; Arendt, A., Bolch, T., Cogley, G., Gardner, A., Hagen, J. O., Hock, R., Kaser, G., Paul, F., Radic, V., Bliss, A., Fountain, A., Mercer, A., Negrete, A., Giffen, B., Menounos, B., Kienholz, C., Mayer, C., Nuth, C., Burgess, D., Hall, D., Kriegel, D., Berthier, E., Burgess, E., Cawkwell, F., Wyatt, F., Hartmann, G., Wolken, G., Frey, H., Brown, I., Howat, I., Lund, J., Rich, J., Filbert, K., Andreassen, L., Copland, L., Beedle, M., Koenig, M., Sharp, M., Moelg, N., Sigurdsson, O., Rastner, P., Forester, R., LeBris, R., Pettersson, R., Wheate, R., Herreid, S., Vorogushin, S., Winsvold, S., Chinn, T., Hagg, W., and Manley, W.: Randolph Glacier Inventory 1.0: A Dataset of Global Glacier Outlines, Global Land Ice Measurements from Space, Boulder Colorado, USA, Digital Media, 2012.; Barrand, N., Hindmarsh, R., Arthern, R., Williams, C. R., Mouginot, J., Scheuchl, B., Rignot, E., Ligtenberg, S., van den Broeke, M., Edwards, T., Cook, A. J., and Simonsen, S. B.: Computing the volume response of the Antarctic Peninsula ice sheet to warming scenarios to 2200, J. Glaciol., 59, 397–409, 2013.; Bolch, T., Buchroithner, M., Pieczonka, T., and Kunert, A.: Planimetric and volumetric glacier changes in the Khumbu Himal, Nepal, since 1962 using Corona, Landsat TM and ASTER data, J. Glaciol., 54, 592–600, 2008.; Church, J. A., Monselesan, D., Gregory, J. M., and Marzeion, B.: Evaluating the ability of process based models to project sea-level change, Environ. Res. Lett., 8, 014051, doi:10.1088/1748-9326/8/1/014051, 2013.; Cogley, J. G.: Geodetic and direct mass-balance measurements: comparison and joint analysis, Ann. Glaciol., 50, 96–100, doi:10.3189/172756409787769744, 2009.; Ehlschlaeger, C.: Using the AT search algorithm to develop hydrologic models from digital elevation data, in: International Geographic Information Systems (IGIS) Symposium, vol. 89, 275–281, 1989.; Giesen, R. H. and Oerlemans, J.: Climate-model induced differences in the 21st century global and regional glacier contributions to sea-level rise, Climate Dynamics, doi:10.1007/s00382-013-1743-7, 2013.; Gregory, J. M. and Oerlemans, J.: Simulated future sea-level rise due to glacier melt based on regionally and seasonally resolved temperature changes, Nature, 391, 474–476, 1998.; Gregory, J. M.

 

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