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Close inspection of the thin sections involved reveals that the increase in the smaller mean crystal size values actually reflects two crystal arrangements: a real increase of the minimum crystal size (as in thin section photograph A 87b in Fig. 3) and a minor population of smaller crystals distributed in pockets and narrow bands at the boundary of larger crystals, often showing undulose extinctions (Fig. 7, A 95 and C39). 27 While the unit described above extends to the base of core 97-1 (c. 40m deep), a further change is apparent from a depth of c.
This unit crop out at the surface of the accumulation area cores, and thins downglacier, forming the uppermost 22m, 16m and 2m of cores 97-1, 97-2 and 97-3 respectively. Unit 2 (grey core shading) is characterized by an increased range of crystal sizes and a slight regular increase in the minimum crystal size. The first half of this unit shows a similar fabric to that of the directly overlying Unit 1 ice in the 1997 accumulation area cores, at least in the fine grained fraction (Fig. 3, A 59 fine).
L. TRICKETT & P. M. S. edu) Abstract: Sulphuric acid is a naturally occurring contaminant in ice. 1 ppm H^SCU reduced both the peak strength and the subsequent flow stress of ice single crystals that deform primarily by basal slip. 8 ppm sulphuric acid of various orientations again deforming primarily by basal slip. The results show that sulphuric acid dramatically decreases both the peak stress and the subsequent flow stress of ice single crystals at all strain rates. 97 and was unaffected by the dopant.