Tide Gauge Records, Davis, Australian Antarctic Territory

• Other Authors: Australian Antarctic Division (isOwnedBy)
• Format: Dataset
• Language: unknown
• Published: data.gov.au
• Subjects: AMD; ANTARCTICA; CEOS; MOORINGS; SOUTHERN OCEAN; TIDE GAUGE; TIDE GAUGES; TIDES; Antarctic; Australian Antarctic Territory; Psi; Pyramid; Pyramid The; Southern Ocean; Antarc*; Antarctica
• Online Access: https://researchdata.edu.au/tide-gauge-records-antarctic-territory/1932627; http://data.gov.au/dataset/6f25f6b8-6968-495e-80a1-49786bfe5db7

Tides are measured using a submerged pressure type gauge secured in a heavy concrete mooring at Davis in 7 metres of seawater.\nTidal records are retrieved from the gauge using an inductive loop lowered through a hole in the ice hence the gauge has been undisturbed since it was deployed.\n \nDocumentation dated 2001-03-07\nDavis Submerged Tide Gauge \n\nThe gauge used at Davis was designed in 1991/2 by Platypus Engineering, Hobart, Tasmania . It was intended to be submerged in about 7 metres of water in a purpose made concrete mooring in the shape of a truncated pyramid. The gauge measures pressure using a Paroscientific Digiquartz Pressure Transducer with a full scale pressure of 30 psi absolute. The accuracy of the transducer is 1 in 10,000 of full scale over the calibrated temperature. The overall accuracy of the system is better than +/- 3 mm for a known water density. Data is retrieved from the gauges by lowering a coil assembly on the end of a cable over a projecting knob on the top of the gauge and by use of an interface unit, a serial connection can be established to the gauge. Time setting and data retrieval can be then achieved. One of these of these gauges was deployed at Davis in early 1993 in a mooring in ???? bay. Data has been retrieved from these gauges irregularly since then. The records are complete since deployment except for a few days in late 1995. The loss was caused by a fault in the software which allows directory entries to overwrites data when the directory memory has been filled. Conversion of raw data to tidal records is done as detailed in document DATAFORMAT1.DOC . As the current gauge is expected to require a new battery soon, a new mooring has been placed close to the original. A new gauge is at Davis ready to be deployed as time permits.\nLevelling\n\nLevelling of the gauge at Davis was done by installing a temporary pressure type gauge in shallow water and recording sealevel for 10 days. The temporary gauge was precisely levelled to a permanent benchmark. The temporary gauge was ...