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Near Real Time Sea Ice Temperatures

The 2018 station was installed by the Scott Base crew on 7 August. Below is a temperature contour plot generated from the sea ice thermistor data.

Depths are measured down from the top of the sea ice which is given a reference depth of 0 m.

"Cool" colours (blues) indicate colder temperatures and "warm" colours (reds) indicate warmer temperatures. The depths shown on the plot are the positions of the 20 thermistors.

Please note the below contour plot is automatically generated and may contain some invalid data points which will be removed when this data is post-processed to produce a scientific-quality dataset.

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Go here to find out why sea ice temperature changes with depth.

The large patch of dark red at the bottom of the graph indicates that the temperature sensors at these depths are either sticking below the sea ice cover into the underlying water or are frozen into sea ice that is only a degree or so colder than the underlying water.

Refer to the station description here for further information.

Near Real Time EM Apparent Ice Temperatures

The 2018 station Sea Ice Mass Balance Station was installed with a frequency-domain electromagnetic induction (EM) instrument called a Geonics Ltd. ® EM31. Below is a time-series of ‘Apparent Ice Thickness’ in metres generated from the EM response measured by the device. The reference level for the top of the sea ice is zero metres. Drill-hole measurements of sea ice thickness (blue dots) plus sub-ice layer (SPL) thickness (red dots) made by the Scott Base team for validation are included.

‘Apparent Ice Thickness’ is the total ice thickness of snow (if present) + sea ice. It overestimates the thickness of the sea ice when a sub-ice platelet layer (SPL) is present by a factor of about half the SPL thickness. It is derived empirically by comparing the Apparent Conductivity (mS/m) measured by the EM with drill-hole ice measurements. A strong negative exponential relationship exists between the apparent conductivity of the subsurface and drill-hole measured total ice thickness. Inversion of exponential functions describing this correlation yields transformation equations to convert apparent conductivity (mS/m) to Apparent Ice Thickness in metres.

Please note that this a preliminary analysis. Accordingly, the time-series may contain some invalid data points which will be removed when this data is post-processed to produce a scientific-quality dataset.

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Near Real Time Snow Depths

Below is a timeseries of snow depths as measured by the 2018 mass balance station's ultrasonic sensor. Please note the timeseries plot is automatically generated and may contain some invalid data points which will be removed when this data is post-processed to produce a scientific-quality dataset.

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