Stabilizing feedbacks in glacier-bed erosion / R.B. Alley, D.E. Lawson, G.J. Larson, E.B. Evenson, G.S. Baker.

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008 231002s2003####xx#a##|##|###|0||#0|eng#d
035 ## ‡aSPRI-165714
040 ## ‡aUkCU-P‡beng‡eaacr
245 00 ‡aStabilizing feedbacks in glacier-bed erosion /‡cR.B. Alley, D.E. Lawson, G.J. Larson, E.B. Evenson, G.S. Baker.
260 ## ‡a[S.l.] :‡b[s.n.],‡c2003.
300 ## ‡ap. 758-760 :‡bdiags.
500 ## ‡aNature. Vol. 424(6950) :758-760 (2003).
520 3# ‡aCombines glacier morphology data with understanding of glacier evolution to reveal stabilizing feedbacks in glacier-bed erosion. Explains that process stabilizing (grading) river beds is absent from glaciers because of near-independence of ice flow from bed slope. Advances 'graded glacier' hypothesis, in which thermodynamic effect introduces dependence of subglacial transport on combination of surface and bed slopes. Beds of terminal regions of highly erosive glaciers are stabilized at slopes just sufficient to cause supercooling of subglacial waters and constriction of meltwater channels (20-70% steeper than and opposed to ice-air surface slope). Supports hypothesis with evidence of widespread supercooling and data from Alaskan glaciers indicating both increase and decrease of bed slopes towards equilibrium condition.
530 ## ‡aAlso issued online ‡uurn:doi:10.1038/nature01839‡uhttps://dx.doi.org/10.1038/nature01839
650 07 ‡a551.32 -- Glaciology.‡2udc
650 07 ‡a551.324 -- Land ice.‡2udc
650 07 ‡a551.324.22 -- Glaciers: Matanuska Glacier, Taku Glacier, Muir Glacier.‡2udc
650 07 ‡a551.324.51 -- Land ice, theory of flow.‡2udc
650 07 ‡a551.324.63 -- Land ice, advance and retreat.‡2udc
650 07 ‡a551.324.83 -- Land ice, load.‡2udc
650 07 ‡a556 -- Hydrology.‡2udc
650 07 ‡a551.324.86 -- Glacier streams.‡2udc
650 07 ‡a551.33 -- Glacial geology.‡2udc
650 07 ‡a551.331 -- Glacial erosion.‡2udc
650 07 ‡a551.331.4 -- Glacial erosion, processes.‡2udc
650 07 ‡a551.331.5 -- Glacial erosion and protection. Sub-glacial topography.‡2udc
650 07 ‡a551.331.52 -- Glaciated valleys.‡2udc
650 07 ‡a551.332 -- Glacial deposition.‡2udc
650 07 ‡a551.332.52 -- Moraines, terminal and recessional.‡2udc
650 07 ‡a519.673 -- Modelling.‡2udc
650 07 ‡aE7 -- Glaciology: glacial geology and ice ages.‡2local
651 #7 ‡a(*49) -- Alaska.‡2udc
651 #7 ‡a(*491) -- Alaska, southcentral and southwest.‡2udc
700 1# ‡aAlley, R. B.
700 1# ‡aLawson, D. E.
700 1# ‡aLarson, G. J.
700 1# ‡aEvenson, E. B.
700 1# ‡aBaker, G. S.
773 0# ‡7nnas ‡tNature. ‡gVol. 424(6950) (2003) ‡wSPRI-1046
917 ## ‡aUnenhanced record from Muscat, imported 2019
948 3# ‡a20231002