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Rapid techniques for determining annual accumulation applied at Summit, Greenland

  • Robert L. Hawley (a1) (a2), Elizabeth M. Morris (a2) and Joseph R. McConnell (a3)
Abstract

We have determined accumulation histories by identifying annual-layer horizons in records obtained by three independent methods: (1) glaciochemical analysis on a core, (2) density profiling in the borehole from which the core was taken, using the neutron-probe (NP) technique, and (3) borehole optical stratigraphy (BOS), again in the same borehole. We also used three different techniques for determining density to convert annual-layer thickness to accumulation: (1) gravimetric measurements on core samples, (2) measurement of density using NP and (3) a simple empirical model based on regional climatology. The result is nine different accumulation time series, three of which are completely independent. The chemical-analysis- and NP-derived accumulation time series are correlated, and the ∼70 year means are in agreement. The BOS-derived accumulation ∼70 year mean is slightly lower, probably due to a combination of the empirical density model’s underestimate of the density profile and the misidentification of sub-annual events in the shallow part of the borehole as annual horizons.

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Corresponding author
*Current address: Department of Earth Sciences, Dartmouth College, Hanover, New Hampshire 03755, USA.
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Journal of Glaciology
  • ISSN: 0022-1430
  • EISSN: 1727-5652
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