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Variation of Ice Velocity at Lewis Glacier, Mount Kenya, Kenya: Verification Midway Into a Forecast

  • Phillip Kruss (a1) and Stefan Hastenrath (a1)

Abstract

The ice velocity slowdown occurring at Lewis Glacier, Mount Kenya, during the twentieth century has continued beyond 1978. In an earlier paper, a surface velocity decrease approaching 50% was predicted between 1978 and 1985. Measurements to January 1982, halfway through the period, reveal trends generally in line with this forecast: a velocity reduction of order 20% has taken place. The mass flux decreased by at least 25%. Intra-annual variability in velocity pattern and magnitude is apparent; comparatively rapid values occur during the January–February dry season.

Résumé

Le ralentissement de la vitesse du Lewis Glacier au Mont Kenya au cours du 20ème siècle a continué depuis 1978. Dans un précédent article une diminution de la vitesse de surface de près de 50% avait été prévue entre 1978 et 1985. Des mesures de janvier 1982 à mi-course de cette période, révèlent des tendances générales en accord avec cette prévision; une réduction de la vitesse de l’ordre de 20% a été constatée. Le flux matériel a diminué d’au moins 25%. La variabilité intra-annuelle dans le comportement des vitesses et leur ordre de grandeur est mise en évidence; les valeurs relativement rapides se situent durant la saison sèche de janvier—février.

Zusammenfassung

Die Verlangsamung der Eisfliessgeschwindigkeit am Lewis Glacier. Mount Kenya, während des 20. Jahrhunderts dauert über 1978 hinaus an. In einer früheren Veröffentlichung wurde eine Geschwindigkeitsabnahme von nahezu 50% über den Zeitraum 1978 bis 1985 vorausgesagt. Messungen bis 1982, also über den halben Vorhersagezeitraum, zeigen eine mit der Prognose übereinstimmende Entwicklung an: die Geschwindigkeit hat um etwa 20% und der Massenfluss um wenigstens 25% abgenommen. Es deutet sich ein Jahresgang der Eisbewegung an, derart dass vergleichsweise hohe Geschwindigkeiten während der Trockenmonate Januar–Februar auftreten.

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Copyright

References

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Bhatt, N., and others. [1982.] Ice thickness determination at Lewis Glacier, Mount Kenya: seismology, gravimetry, dynamics, by N. Bhatt, S. Hastenrath, and P. Kruss. Zeitschrift für Gletscherkunde und Glazialgeologie, Bd. 16, Ht. 2, 1980, p. 21328.
Hastenrath, S. Kruss, P. [1981.] Dynamics of crevasse pattern at Lewis Glacier, Mount Kenya. Zeitschrift für Gletscherkunde und Glazialgeologie, Bd. 15, Ht. 2, 1979, p. 20107.
Hastenrath, S. Kruss, P. 1982. On the secular variation of ice flow velocity at Lewis Glacier, Mount Kenya, Kenya. Journal of Glaciology, Vol. 28, No. 99, p. 33339.

Variation of Ice Velocity at Lewis Glacier, Mount Kenya, Kenya: Verification Midway Into a Forecast

  • Phillip Kruss (a1) and Stefan Hastenrath (a1)

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