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Antarctic Operational Meteorology



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Figure 2 Launching a radiosonde Macquarie Island 1968—note radar target for upper wind measurement (Photo S. Harris—Antarctic Division).

  Launching radiosonde Macquarie Island

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Figure 3 An example of station climatology. Some characteristics of the wind regime of Mawson (after Streten 1990). Annual variation at Mawson for indicated pressure levels expressed in hectopascals (hPa) of: (a) Mean upper wind speed (ms-1—full lines) and direction (arrow points vertically for southerly winds and horizontally to the right for a westerly wind); (b) percentage constancy of wind direction (note change of scale between 100 and 90 hPa—28 years of data 1956–1983). Annual variation at Mawson of: (c) mean windspeed based on monthly data A—mean, B and C extremes for individual months; (d) percentage frequency of wind direction; figures at the right show monthly mean percentage of calms—30 years of data 1954–1983; (e) diurnal variation (Local times—LT) at Mawson of percentage frequency of light winds <1.4ms-1 or 2.7 knots. Figures at the right show total frequency for all hours.

  Example of station climatology

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Figure 4 Meteorological conditions during a typical prolonged winter blizzard at Mawson (29 June to 6 July 1958). The lower panel shows present weather symbols and shading corresponding to visibility and cloud criteria, X indicates sky obscured by drifting snow (after Streten 1968).

  Winter blizzard at Mawson

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© Online Edition Australian Science and Technology Heritage Centre and Bureau of Meteorology 2001
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