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Secular Trends of Accumulation Rates at Three Greenland Stations

  • N. Reeh (a1), H.B. Clausen (a1), W. Dansgaard (a1), N. Gundestrup (a1), C.U. Hammer (a1) and S.J. Johnsen (a1)...

Abstract

The annual layer thickness profiles along three 400 m ice cores are transferred into accumulation-rate records. A linear decrease of 3±2% per millenium is found in mid-Greenland. Intermediate-term (periods longer than 120 years) deviations from the linear trend lines are less than 5% in mid-Greenland but reach 11% at Dye 3 around A.D. 1700 and 1400. Short-term (periods between 120 and 30 years) oscillations are generally in phase at Milcent and Crête.

Résumé

Les profils d'épaisseur des niveaux annuels le long de 400 m de trois carottes de glace sont transformés en registrements de vitesse d’accumulation. On trouve une diminution linéaire de 3±2% par millénaire dans le centre du Groenland. Des variations de durée intermédiaire (périodes de durée supérieure à 120 ans) autour de cette tendance lineaire solnt de moins de 5% dans le centre du Groenland mais atteignent 11% a Dye 3 autour des annees 1700 a 1400 de notre ere. Des oscillations de durée courte(periods entre 120 et 30 ans) sont en general en phase a Milcent et á Crête.

Zusammenfassung

Die Dickenprofile der Jahresschichten längs dreier 400 m Bohrkerne werden in Akkumulationsraten umgerechnet. In Mittel–Gronland ergibt sich eine lineare Abnahme von 3±2% pro Jahrtausend. Mittelperiodische(über mehr also 120 Jahre) Abweichungen vom linearen Verlanuf sind geringer als 5% in Mittel–Grônland, erreichen aber 11% bei Dye 3 um die Jahre 1700 und 1400. Kurzperiodische (zwischen 120 und 30 jahrcn) Schwankungen in Milcent und Crete weisen im allgemeinen Gleichzeitigkeit auf.

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References

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Benson,, C.S. 1962. Stratigraphic studies in the snow and firn of the Greenland ice sheet. U.S. Snow, Ice and Permafrost Research Establishment . Research Report. 70.
Gudmandsen,, P. 1973. Radioglaciology—soundings at proposed drill sites. Lyngby, Technical University of Denmark.Laboratory of Electromagnetic Theory. (Report for GISP No. D185.)
Hammer,, C.U., and others. 1978. Dating of Greenland ice cores by flow models, isotopes, volcanic debris, and continental dust, by Hammer,, C.U.,Clausen,, H.B. Dansgaard,, W. Gundestrup,, N. Johnsen, S.J. and Reeh., N. Journal of Glaciolagy, Vol.20, No.82,p.326.
Karsten,, A., and Stober,, M. 1975. Deformationsmessungen auf dem gronlandischen Inlandeis wahrend der Intern. Glaziologischen Gronlandexpedition 1974. Polarforschung, 45. Jahrg., Nr. 1,p.4550.
Philberth,, K., and Federer,, B. 1971. On the temperature profile and the age profile in the central part of cold ice sheets. Journal of Glaciology, Vol.10, No.58, p.314.

Secular Trends of Accumulation Rates at Three Greenland Stations

  • N. Reeh (a1), H.B. Clausen (a1), W. Dansgaard (a1), N. Gundestrup (a1), C.U. Hammer (a1) and S.J. Johnsen (a1)...

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