Muhtasari

The effective rate of change in glacier thickness, also known as the glaciological mass balance, is a measure of the average change in a glacier's thickness after correcting for changes in density associated with the compaction of snow and conversion to ice. The map shows the average annual rate of thinning since 1970 for the 173 glaciers that have been measured at least 5 times between 1970 and 2004 (Dyurgerov and Meier 2005). Larger changes are plotted as larger circles and towards the back.

All survey regions except Scandinavia show a net thinning. This widespread glacier retreat is generally regarded as a sign of global warming.

During this period, 83% of surveyed glaciers showed thinning with an average loss across all glaciers of 0.31 m/yr. The most rapidly growing glacier in the sample is Engabreen glacier in Norway with a thickening of 0.64 m/yr. The most rapidly shrinking was Ivory glacier in New Zealand which was thinning at 2.4 m/yr. Ivory glacier had totally disintegrated by circa 1988 [1].

Copyright

This figure was originally prepared by Rober A. Rohde from published data and is incorporated into the Global Warming Art project.

Image from Global Warming Art

This image is an original work created for Global Warming Art. Please refer to the image description page for more information.

Ruhusa inakubalika kunakili, kusambaza na/au kurekebisha chini ya matakwa ya GNU Free Documentation License, Toleo 1.2 au toleo lolote lile la baadaye ambalo litachapishwa na Free Software Foundation; lisilo na Sehemu Tofauti, lisilo na Maandishi-Kava-Kwa-Mbele, na lisilo na Maandishi-Kava-Kwa -Nyuma. Nakala ya hatimiliki inajumlishwa kwenye sehemu ilioitwa GNU Free Documentation License.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue

	Faili hii imeidhinishwa chini ya Creative Commons Attribution- Attribution-Share Alike 3.0 Unported leseni.
	Uko huru: kushiriki – kunakili na kusambaza kazi hiyo kwa remix – kurekebisha kazi Chini ya masharti yafuatayo: sifa – Ni lazima utoe mkopo unaofaa, utoe kiungo cha leseni, na uonyeshe ikiwa mabadiliko yalifanywa. Unaweza kufanya hivyo kwa njia yoyote inayofaa, lakini si kwa njia yoyote inayopendekeza mtoa leseni akuidhinishe wewe au matumizi yako. shiriki sawa – Ukichanganya, kubadilisha, au kujenga juu ya nyenzo, lazima usambaze michango yako chini ya same or compatible license kama ya awali.
	This licensing tag was added to this file as part of the GFDL licensing update.http://creativecommons.org/licenses/by-sa/3.0/CC BY-SA 3.0Creative Commons Attribution-Share Alike 3.0truetrue

Notes

This sample of mountain glaciers excludes the primary ice sheets of Greenland and Antarctica.

It should be acknowledged that glacier sampling is heavily biased towards North America and Europe. Africa has only a handful of glaciers, whereas continental Australia has none. However substantial unsampled mountain glaciers do exist in South America, Asia and the margins of Antarctica. Despite their importance, none of the marginal Antarctic glaciers have had their mass balance sampled at least 5 times since 1970.

These estimates of ice sheet thinning do not include glacier mass lost due to iceberg calving. Such calving is not significant for most mountain glaciers, since only a small proportion of these glaciers terminate in the ocean.

Reference

• Dyurgerov, Mark B. and Mark F. Meier (2005). "Glaciers and the Changing Earth System: A 2004 Snapshot". Institute of Arctic and Alpine Research, Occasional Paper 58.

Other versions

• 
  Portuguese