Tide Gauge Records, Davis, Australian Antarctic Territory
Entry ID: Davis_TG_2

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Summary
Abstract: Tides are measured using a submerged pressure type gauge secured in a heavy concrete mooring at Davis in 7 metres of seawater.
Tidal records are retrieved from the gauge using an inductive loop lowered through a hole in the ice. The gauge has been removed and replaced once since it was deployed to download data (Refer Henk Brolsma).

Documentation dated 2001-03-07
Davis Submerged Tide Gauge

The 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.
Levelling

Levelling 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 then calibrated using a known height of seawater from the bay at the same temperature as the water in the bay. The density of the seawater was accurately measured. This work, in conjunction with the tidal records from the submerged gauge have enabled a MSL for Davis to be established. Permanent Tide Gauge. No suitable sites for an Aquatrak type gauge at Davis have been identified.

Documentation dated 2008-10-17
There are two submerged tide gauges at Davis. One is soon to be removed to have its battery replaced.
These gauges record pressure and temperature values. The download software only formats these records to produce 10 minute average presure values (hPa) and unscaled temperature values.

Related URL
Link: GET DATA
Description: Chart of available tide gauge data and excel spreadsheet


Link: VIEW PROJECT HOME PAGE
Description: National Tidal Centre


Link: VIEW RELATED INFORMATION
Description: Details of conversion of raw data.


Link: VIEW RELATED INFORMATION
Description: Levelling connection GA ARGN/GPS to tide gauge


Link: VIEW RELATED INFORMATION
Description: Citation reference for this metadata record and dataset


Geographic Coverage
 N: -68.575 S: -68.585  E: 77.975  W: 77.965

Temporal Coverage
Start Date: 2002-05-23


Location Keywords
CONTINENT > ANTARCTICA
GEOGRAPHIC REGION > POLAR


Science Keywords
OCEANS >SEA SURFACE TOPOGRAPHY >SEA SURFACE HEIGHT    [Definition]
OCEANS >TIDES >TIDAL COMPONENTS    [Definition]
OCEANS >TIDES >TIDAL CURRENTS    [Definition]
OCEANS >TIDES >TIDAL HEIGHT    [Definition]
OCEANS >TIDES >TIDAL RANGE    [Definition]


ISO Topic Category
ELEVATION
OCEANS


Platform
MOORINGS    [Information]


Instrument
TIDE GAUGES    [Information]


Quality
The data set from thsi gauge is complete since the time of deployment. A chart showing what data are available (&Chart of available data& - correct as of 2005-07-20). Pressure and temperature data are retrieved from the submerged gauge when time and weather allow. The records are in hex format. Records are stored as datalogger memory images and must be processed to enerate *.tg files. Tidal records are checked for gross errors in height values and obvious timing errors. Further checks are done by NTC during processing.


Access Constraints
Records are stored in the form in which they are retrieved from the tide gauges. Futher processing is done by the National Tidal Centre. Processed data are available in graphical form from the National Tidal Centre.


Use Constraints
This data set conforms to the PICCCBY Attribution License
(http://creativecommons.org/licenses/by/3.0/).

Please follow instructions listed in the citation reference provided at the URL below when using these data.


Keywords
ANTARCTICA
SOUTHERN OCEAN
TIDE GAUGE
TIDES


Data Set Progress
IN WORK


Originating Center
AADC


Data Center
Australian Antarctic Data Centre, Australia    [Information]
Data Center URL: http://data.aad.gov.au

Data Center Personnel
Name: DATA OFFICER AADC
Phone: +61 3 6232 3244
Fax: +61 3 6232 3351
Email: metadata at aad.gov.au
Contact Address:
Australian Antarctic Division
203 Channel Highway
City: Kingston
Province or State: Tasmania
Postal Code: 7050
Country: Australia



Distribution
Distribution_Format: hex
Fees: free


Personnel
HENK BROLSMA
Role: TECHNICAL CONTACT
Role: INVESTIGATOR
Role: DIF AUTHOR
Phone: +61 3 6232 3528
Fax: +61 3 6232 3351
Email: mapping at aad.gov.au
Contact Address:
Australian Antarctic Division
203 Channel Highway
City: Kingston
Province or State: Tasmania
Postal Code: 7050
Country: Australia



Creation and Review Dates
DIF Creation Date: 1999-10-07
Last DIF Revision Date: 2014-01-10

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