| Summary: | Progress Code: onGoing Statement: See the data download for more details. Each tide gauge typically encountered some problems throughout its life, resulting in data gaps, or poorer quality data. There are substantial gaps in the dataset since the installation of the primary gauge. These data have been through an extensive 'clean-up' to improve their quality as much as possible (see the document in the download file). Purpose Measurement of tides and determination of sea levels. Over time there have been a number of tide gauges deployed at Macquarie Island Station. The data download files contain further information about the gauges, but some of the information has been summarised here. Note that this metadata record only describes tide gauge data from 1993 to 2007. More recent data are described elsewhere. Macquarie Island used Aquatrak and Druck tide gauges during this period. Documentation from the older metadata record: Documentation dated 2001-06-12 The Macquarie Island Tide Gauge System The Macquarie Island Tide Gauge was first commissioned in November 1993. Since then every year attempts have been made to improve the performance of the system. The next improvement involves the installation of radio modems to effect a network link to the tide gauge dataloggers. Other improvements planned are include using the wave guide temperatures to correct the water heights for variations in the velocity of sound in air due to temperature gradients in the waveguide. The system consists of two separate sensors contained in separate housings on a rock shelf on the northern side of Garden Cove. One of the sensors is an Aquatrack acoustic type and the other is a Druck pressure transducer. Both housings contain a Platypus Engineering data logger and a battery. The housings consist each of an Admiralty Bronze ring bolted down to a concrete plinth and a glass fibre reinforced cover held down by a single central bolt and nut. Primary power for both installations comes from a solar panel array mounted on the northern side ...
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