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On the Relation of Net Balance, Ice Flow, and Surface Lowering of Lewis Glacier, Mount Kenya, East Africa, 1982–86

  • Stefan Hastenrath (a1)

Abstract

The second 4 year phase of a long-term observation program on Lewis Glacier, Mount Kenya, was completed in March 1986. As for the 1978–82 interval, net-balance results at a stake network and repeated mapping of the ice-surface topography allowed assessment of the mass economy by both “glaciological” and “geodetic” methods.

The general findings from the 1978–82 observations are confirmed: the vertical flow component is directed downward in the upper glacier, and upward in the lower glacier; surface lowering and negative net balance increase down-glacier; ice flow mitigates surface lowering by the negative net balance in the lower glacier, but enhances it in the upper glacier. However, the major difference between the 1982–86 and 1978–82 periods is the progressive slow-down of ice flow. This entails a reduction of mass redistribution, in consequence of which the surface lowering becomes increasingly dependent on the in-situ net balance. It is expected that this circumstance will simplify any inference on future glacier behavior.

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References

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Bhatt, N. and others. 1980. Ice thickness determination at Lewis Glacier, Mount Kenya: seismology, gravimetry, dynamics, by Bhatt, N., Hastenrath, S. and Kruss, P. Zeitschrift für Gletscherkunde und Glazialgeologie, Bd. 16, Ht. 2, p. 21328.
Caukwell, R.A. and Hastenrath, S. 1982. Variations of Lewis Glacier, Mount Kenya 1978–82. Erdkunde, Bd. 36, Ht. 4, p. 299309
Hastenrath, S. 1983. Net balance, surface lowering, and ice flow pattern in the interior of Lewis Glacier, Mount kenya, kenya. Journal of Glaciology, Vol. 29, No. 103, p. 392402
Hastenrath, S. 1984. The glaciers of equatorial East Africa. Dordrecht, etc., D. Reidel Publishing Co.
Hastenrath, S. 1987. Continued decrease of ice-flow velocity at Lewis Glacier, Mount Kenya, East Africa. Journal of Glaciology Vol 33, No. 113, p. 7992
Hastenrath, S. and Caukwell, R.A 1987. Variations of Lewis Glacier mount kenya, 1982–86. Erdkunde, Bd 41 Ht 1 p 3741
Hoinkes, H. 1970. Methoden und Möglichkeiten von Massenhaushaltsstudien auf Gletschern. Ergebnisse der Messreihe Hintereisferner (Ӧtztaler Alpen) 1953–1968. Zeitschrift für Gletscherkunde und Glazialgeologie, Bd. 6, p. 3790

On the Relation of Net Balance, Ice Flow, and Surface Lowering of Lewis Glacier, Mount Kenya, East Africa, 1982–86

  • Stefan Hastenrath (a1)

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