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Article
Topographic Control of Asynchronous Glacial Advances: A Case Study from Annapurna, Nepal
Geophysical Research Letters
  • B. Pratt-Sitaula
  • D. W. Burbank
  • A. M. Heimsath
  • Neil Humphrey, University of Wyoming
  • M. Oskin
  • J. Putkonen
Document Type
Article
Publication Date
12-30-2011
Disciplines
Abstract
Differences in the timing of glacial advances, which are commonly attributed to climatic changes, can be due to variations in valley topography. Cosmogenic Be-10 dates from 24 glacial moraine boulders in 5 valleys define two age populations, late-glacial and early Holocene. Moraine ages correlate with paleoglacier valley hypsometries. Moraines in valleys with lower maximum altitudes date to the late-glacial, whereas those in valleys with higher maximum altitudes are early Holocene. Two valleys with similar equilibrium-line altitudes (ELAs), but contrasting ages, are aspect, such that spatial differences in climate can be excluded. A glacial mass-balance cellular automata model of these two neighboring valleys predicts that change from a cooler-drier to warmer-wetter climate (as at the Holocene onset) would lead to the glacier in the higher altitude catchment advancing, while the lower one retreats or disappears, even though the ELA only shifted by similar to 120 m.
DOI
10.1029/2011GL049940
Comments

An edited version of this paper was published by AGU. Copyright 2011 American Geophysical Union.

Citation Information
B. Pratt-Sitaula, D. W. Burbank, A. M. Heimsath, Neil Humphrey, et al.. "Topographic Control of Asynchronous Glacial Advances: A Case Study from Annapurna, Nepal" Geophysical Research Letters Vol. 38 (2011)
Available at: http://works.bepress.com/neil_humphrey/6/