Instrument: Phase-sensitive radar (ApRES)

Research teams use phase-sensitive radars for determining ice shelf basal melt rates.  Data is used to enhance climate models.

The ApRES instruments yield time series of ice shelf thickness change at precisions of ~1 mm.  Measurements taken over a 10-day period will generate information about derived melt rate of a few cm per annum or better. The is used improve the performance of  ocean models.

ApRES phase-sensitive radar is a low-power, light-weight instrument developed in a collaboration between BAS and University College London. It is a 200-400 MHz FMCW radar, with a 1-second chirp, run by controller: housed within its characteristic yellow box the radar and a 100 AH battery is buried in a shallow hole.  The radar’s transmit aerial and receive aerial are spaced 5 meters each side of the yellow box and are also buried. Each system will record for a nominal 12 months and has the ability to process and send, via satellite link, melt-rate data.

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