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Darwin (Australia) Data Quality Assessment

Quality assessment of sea level data by TOGA Sea Level Center/National Oceanographic Data Center Joint Archive for Sea Level

Station Darwin Latitude 12°, 28.0' S
Country Australia Longitude 13°0 51.0' E
JASL # 168A Time Meridian 135° E (GMT + 9 hr)
GLOSS # 062 TOGA # I044
NODC # 31132001
Contributor: The National Tidal Facility Flinders University of South Australia GPO Box 2100 Adelaide, 5001, South Australia AUSTRALIA
Originator: Same
Original Data: Analog
Instrument Type: Leupold Stevens A71 float and stilling well gauge.
Digitized Interval: Unconfirmed
Present Data: Hourly, daily, and monthly values obtained by:
Hourly: Unconfirmed
Daily: 119-point convolution filter (Bloomfield, 1976) centred on noon applied to the hourly data with respective periods of the 95, 50, and 5% amplitude points at 124.0, 60.2, and 40.2 hours.
Monthly: Simple average of all daily values; calculated if 7 or fewer days are missing.
Span of Data: 01 January 1984 - 31 December 1990
Gaps > 1 Month: 19 September 1984 - 14 February 1985
Time Reference: GMT (hours 00-23)
Space-filler Flag: -9999
Units: Millimeters
Missing Data Flag: 99999
Reference Level: The sea level heights are referred to the zero point assigned to the tide staff. Bench mark information is available upon request from the contributors.
Comment: The residuals (observed data minus predicted tides) are very noisy, probably due to shallow water and complex coastal geometry effects that are not resolved by the harmonic analysis. The hourly data may also contain periods with timing errors which are not offset by increments of one hour; however, these periods are not identifiable due to the large fluctuations in the residuals from the unresolved harmonic analysis. Otherwise, the daily and monthly values are reasonable and do not reveal any obvious reference level shifts. The daily means agree well with the nearest station, Wyndham.
Special Note from the Data Contributors: Supply of sea level data subject to the following conditions:
  1. When any data supplied by the National Tidal Facility is used in any publication or report, the origin of such data shall be acknowledged in that publication or report in the following approved form:-- "Tidal {predictions) for {port} {are} supplied {constants} {station} {is} {material} {...} by the National Tidal Facility, The Flinders University of South Australia, Copyright reserved."
  2. All material is supplied in good faith and is believed to be correct. It is supplied on the condition that no warranty is given in relation thereto, that no responsibility or liability for errors or omissions is, or will be, accepted and that the recipient will hold the Flinders University of South Australia and the National Tidal Facility free from all such responsibility or liability and from all loss or damage incurred as a consequence of any error or omission.
  3. The acceptance of material and computations from the National Tidal Facility of the Flinders University of South Australia will be deemed to include acceptance of the conditions of supply.