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|a Glaciers and the Changing Earth System: A 2004 Snapshot |h [electronic resource]. |
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|a Occasional Paper No. 58. |
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|a Please contact the owning institution for licensing and permissions. It is the user's responsibility to ensure use does not violate any third party rights. |
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|a Glacier changes are having impacts on processes of global importance such as sea-level
rise, hydrology of mountain-fed rivers, freshwater balance of oceans, and even the shape and
rotation of the Earth. Here we discuss the effects of “small glaciers” — all perennial ice masses
other than the Greenland and Antarctic ice sheets. We now estimate that the total area of these glaciers and ice caps to be about 785 ± 100 103 km2, somewhat larger than earlier estimates because of improved information on isolated glaciers and ice caps around the periphery of the large ice sheets. We estimate the total volume of this ice to be about 260 ± 65 103 km3, equivalent to 0.65 ± 0.16 m of sea-level rise.
Glacier mass balance data (both annual and seasonal) can be used to infer current climatic
change in precipitation and temperature, and the spatial distribution of these can assist in the
analysis and modeling of climate change. This is especially important in high-mountain and
high-latitude areas, where precipitation data are few and biased. Air temperature increase is the
major forcing of glacier change. Glacier response to recent climate warming shows a steepening
mass balance gradient with altitude due to increasing ice ablation below the equilibrium line
altitude, and, to a lesser extent, increasing snow accumulation above that altitude. Observational results also show increasing glacier mass turnover and mass balance sensitivity to air temperature; these changes are not predicted by existing climate/glacier models. Sensitivity and turnover have also decreased in variability starting at the end of the 1980s. –1 for the period 1961– –1. This freshwater addition to the oceans may be affecting ocean circulation and ocean ecosystems, and causing
socio-economic impacts due to sea-level change. This contribution from glaciers is likely to
continue to increase in the future. Acceleration of glacier wastage also affects other global
processes, including spatial and temporal changes in the Earth’s gravitational field, Earth
oblateness and rotation rate, and regional uplift. Global acceleration of glacier volume losses has affected the freshwater cycle at many
scales, from global to local. The glacier contribution to the freshwater inflow to the Arctic Ocean has been increasing, and this increase will affect many aspects of the arctic climate system.Increasing summer runoff to large Asian rivers and high-elevation glacierized watersheds in both Americas is important for agriculture and human needs, but this release of water from ice storage may diminish in the future as the relatively small high-mountain glaciers begin to disappear. |
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|a Electronic reproduction. |c Florida International University, |d 2015. |f (dpSobek) |n Mode of access: World Wide Web. |n System requirements: Internet connectivity; Web browser software. |
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|t Glaciers and the Changing Earth System: A 2004 Snapshot |
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|a dpSobek |c Sea Level Rise |
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|u http://dpanther.fiu.edu/dpService/dpPurlService/purl/FI15061986/00001 |y Click here for full text |
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|3 Host material |u http://geodesy.unr.edu/hanspeterplag/library/climate/OP58_dyurgerov_meier.pdf |y Glaciers and the Changing Earth System: A 2004 Snapshot |
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|a http://dpanther.fiu.edu/sobek/content/FI/15/06/19/86/00001/FI15061986thm.jpg |
