Darwin (Australia) Site History

History Summary

Station Name Darwin
Country Australia
Latitude 12° 28.0' S
Longitude 130° 51.0' E
GLOSS No. 062
Contributor
(1984-1989)
TOGA Sea Level Center
Contributor
(1990-1998)
National Tidal Facility (NTF)
Flinders University of South Australia
GPO Box 2100, Adelaide,
5001, South Australia
Instrument Type (1984-1990) Leupold and Stevens A71 float and stilling well gauge
(18/05/90-1998) NGWLMS (Acoustic gauge)
Site of Gauge  
Observational Period 1981 - 2001
Reference Level All data are referred to Tide Gauge Zero (TGZ) and are linked into historic fixed benchmarks.

Tide Gauge Benchmark (TGBM) Description

BM Control - BM 70/8 bronze plaque at ground level behind kerb at corner of Kitchener Drive and the boom shed road.

Auxiliary Benchmarks

Benchmark Description
BM 100 10x30mm brass block with identification tag set in concrete retaining wall at the abutment of Stokes Hill Wharf.
BM 3046 Top of south east corner holding down bolt on base plate of power pole at the abutment of Fort Hill Wharf.
BM 3047 Bolt near the tide gauge hut, Fort Hill Wharf.

Benchmark Relationships

TGZ = Local Chart Datum for both tide gauges, but with varying precision.
TGZ = 3.975m below Australian Height Datum (AHD)
TGZ = 10.335m below BM 70/8

Quality Assessment

Comments

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.

Since 1991, atmospheric pressure has been measured at the tide gauge site.

Year CI(%) QI(%) Missing Data Replaced Gaps or Bad Data Questionable Fluctuations
1984 71 71 4-6,263-366 (09)034-(23)034 see comment above
1985 88 88 1-46 none see comment above
1986 99 99 344-345 none see comment above
1987 95 95 101-119 none see comment above
1988 97 97 7-8,30-34, 257-263 (05)256-(03)257(12)278-(00)279 see comment above
1989 100 100 none none see comment above
1990 99 99 254 none see comment above
1991 99 99 123-126 none see comment above
1992 100 100 none none see comment above
1993 100 100 none none see comment above
1994 100 100 none none see comment above
1995 100 100 none none see comment above
1996 100 100 none none see comment above
1997 100 100 none none see comment above
1998 100 100 none none see comment above
1999 99 100 146-148 none see comment above
2000 99 100 293-294 none see comment above
2001 100 100 none none see comment above