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Ice Composition and Glacier Dynamics by Dr. Roland A. Souchez, Dr. Reginald D. Lorrain (auth.)

By Dr. Roland A. Souchez, Dr. Reginald D. Lorrain (auth.)

Ice composition has formerly been more often than not used for reconstructing the surroundings of the prior. a very good study attempt is made this day to version the weather method during which the ice conceal on the earth sur­ face performs a famous position. to acquire an accurate version of the ice sheets, due awareness needs to be paid to the actual procedures working on the interfaces, i. e. the boundary stipulations. the belief in the back of the name of this booklet is that the examine of ice composition can shed a few gentle at the a number of strategies working on the ice­ bedrock and ice-ocean interfaces and extra quite often on glacier dy­ namics. The ebook isn't meant as a treatise on a few really expert subject of glaciology. it really is generally the made from the adventure of the 2 authors won over a number of years examine at the topic. the 2 authors are either participants of an analogous collage division and private neighbors. The publication used to be ready within the following means. After a primary draft of the full e-book were written by means of the 1st writer, it used to be installed the palms of the second one. the ultimate model despatched to the publishers is for that reason the results of ex­ tended dialogue, whereas while conserving the solidarity of fashion that will were misplaced had the 2 authors written chosen chapters of the e-book separately. The booklet is prepared into distinctive parts.

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In the example given at the end of the previous section, the isotopic variation produced by evaporation pro60 %0 -80 -100 -120 -140 6 "0 -6 -8 -10 -12 -1 4 -16 - 18 -20 0/ 00 II I 0 I 10 I 20 I 30 I 40 I 50 I 60 I 70 • 69% Fig. 7. Changes in JD, J 180 values and weight loss of snow samples evaporating in a cold chamber of about -10 DC. 01 g/cm2 . (Moser imd Stichler 1975, Fig. 9) 40 Ice Composition 60 %. S. oD-o lsO relationship of the samples of Fig. 7. S Slope of the evaporation line. The dashed curve corresponds to the precipitation line.

Characteristic clusters of curved filament-like bubbles are present and also large spherical, irregular or flat horizontal air inclusions which have been precipitated from the solution. Banding can occur, depending largely on the rate of meltwater freezing and the degree of saturation of the snow. Both affect the crystal size and bubbliness of ice (Koerner 1970). Owing to the spatial migration of the different zones through time, different ice types can occur in the same vertical section. As indicated above in this chapter, these ice types undergo changes in crystal-fabric as they travel through the accumulation zone to the ablation zone.

The values are related to each other by . With an input having the same isotopic composition, results of the simulation give, for different values of AIS, superimposed lines forming a freezing slope that corresponds exactly to the one calculated from Eq. (3). 5%0 . These values are also on the meteoric water line with the deuterium excess equal to 10. No output has been considered. 0 -175. 1l " 0 'I,. Fig. 16. Computer simulation of the evolution in oD and 0 1S0 of ice during freezing if an initial reservoir is mixed with an input having a lighter isotopic composition.

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