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Immediate report of Victoria University of Wellington Antarctic Expedition 1989-90: VUWAE 34

[figures]

page 28
Figure 1 Net transmission of the ice vs wavelength in the UV and visible on the 9 November 1989.

Figure 1 Net transmission of the ice vs wavelength in the UV and visible on the 9 November 1989.

page 29
Figure 2 Time evolution of the transmission of the ice (a) at the UV wavelengths 250 nm (●), 280 nm (∆), 300 nm (O), 350 nm (▲), and 400 nm (□), and (b) at visible wavelengths of 500 nm (O), 600 nm (□), and 700 nm (∆).

Figure 2 Time evolution of the transmission of the ice (a) at the UV wavelengths 250 nm (●), 280 nm (∆), 300 nm (O), 350 nm (▲), and 400 nm (□), and (b) at visible wavelengths of 500 nm (O), 600 nm (□), and 700 nm (∆).

page 30
Figure 3 Depth dependent profiles for (a) temperature, (b) salinity, and (c) density of sea ice. Triangles and circles correspond to data of the 3 and 13 November respectively. In the case of the temperature the plot shows the highest values recorded up to the date in question which were recorded on the 3 and 9 November.

Figure 3 Depth dependent profiles for (a) temperature, (b) salinity, and (c) density of sea ice. Triangles and circles correspond to data of the 3 and 13 November respectively. In the case of the temperature the plot shows the highest values recorded up to the date in question which were recorded on the 3 and 9 November.

page 31
Figure 4 The estimated 300 nm flux at the base of the sea ice at Palmer Station during the 1988 season (upper curve), and before the appearance of the ozone hole (tower curve). The dashed lines indicate seasonal periods for which we have no direct measurements of the ice transmission. The net yearly dose is given by the areas under the curves.

Figure 4 The estimated 300 nm flux at the base of the sea ice at Palmer Station during the 1988 season (upper curve), and before the appearance of the ozone hole (tower curve). The dashed lines indicate seasonal periods for which we have no direct measurements of the ice transmission. The net yearly dose is given by the areas under the curves.

page 32
Figure 5 The heat capacity of sea ice taken from depths of 0-50 mm (●), 339-380 mm (■), and 570-620 mm (▲). The salinities were 1.32, 0.84, and 0.62% respectively. The solid lines are the predictions based on the assumption that the ice-brine mixture is at all times in thermal equilibrium.

Figure 5 The heat capacity of sea ice taken from depths of 0-50 mm (●), 339-380 mm (■), and 570-620 mm (▲). The salinities were 1.32, 0.84, and 0.62% respectively. The solid lines are the predictions based on the assumption that the ice-brine mixture is at all times in thermal equilibrium.