The Home of the Blizzard: Being the Story of the Australasian Antarctic Expedition, 1911-1914Mawson, Douglas, Sir
History
The Home of the Blizzard: Being the Story of the Australasian Antarctic Expedition, 1911-1914
Mawson, Douglas, Sir
Antarctica -- Discovery and exploration; Australasian Antarctic Expedition (1911-1914)
Careful records were taken to establish a relation between magnetic
storms and aurorae, and a good deal of evidence was amassed to support
the fact that auroral exhibitions correspond with periods of great
magnetic disturbance. The displays in Adelie Land were found to be more
active than those which occur in higher latitudes in the Ross Sea.
An occupation which helped to introduce variety in our life was the
digging of ice-shafts. For the purpose of making observations upon its
structure and temperature various excavations were made in the sea-ice,
in the ice of the glacier, and in that of the freshwater lakes. The work
was always popular. Even a whole day's labour with a pick and shovel at
the bottom of an ice-hole never seemed laborious. It was all so novel.
A calm morning in June, the sky is clear and the north ablaze with the
colours of sunrise--or is it sunset? The air is delicious, and a cool
waft comes down the glacier. A deep ultramarine, shading up into a soft
purple hue, blends in a colour-scheme with the lilac plateau. Two men
crunch along in spiked boots over snow mounds and polished sastrugi to
the harbour-ice. The sea to the north is glazed with freezing spicules,
and over it sweep the petrels--our only living companions of the winter.
It is all an inspiration; while hewing out chunks of ice and shovelling
them away is the acute pleasure of movement, exercise.
The men measure out an area six feet by three feet, and take a
preliminary temperature of the surface-ice by inserting a thermometer
in a drilled hole. Then the ice begins to fly, and it is not long before
they are down one foot. Nevertheless it would surprise those acquainted
only with fresh water ice to find how tough, sticky and intractable is
sea-ice. It is always well to work on a definite plan, channelling in
various directions, and then removing the intervening lumps by a few
rough sweeps of the pick. At a depth of one foot, another temperature is
taken, and some large samples of the ice laid by for the examination of
their crystalline structure. This is repeated at two feet, and so on,
until the whole thickness is pierced to the sea-water beneath. At three
feet brine may begin to trickle into the hole, and this increases in
amount until the worker is in a puddle. The leakage takes place, if not
along cracks, through capillary channels, which are everywhere present
in sea-ice.
It is interesting to note the temperature gradually rise during the
descent. At the surface the ice is chilled to the air-temperature, say
-10 degrees F., and it rises in a steep gradient to approximately 28
degrees F.; close to the freezing-point of sea water. The sea-ice in
the boat-harbour varied in thickness during the winter between five and
seven feet.
Public-domain text, read in full here on John Shaqi.
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