Christmas Island (Australia) Site History
History Summary
| Station | Christmas Island |
|---|---|
| Country | Australia |
| GLOSS No | 047 |
| Contributor | 1986-1987: TOGA Sea Level Center
1990-1991: Flinders University of South Australia |
| Instrument Type | Float and stilling well gauge,
Leupold and Stevens Analog-to-Digital Recorder |
| Site of Gauge | The gauge is situated near the north arm cantilever, which is north west of bench mark CHS 2. |
| Observational periods | September 1986-March 1988, August 1990-present |
Tide Gauge Benchmark (TGBM) Description
| Benchmark | Description |
|---|---|
| CHS 1 | The circular brass plaque, numbered CHS1, is set in the bedrock between the two cantilever loaders at Flying Fish Cove. |
| CHS 2 | The circular brass plaque, numbered CHS 2, is set in a concrete pad at the root of the North Arm Cantilever jetty. |
| CHS 3 | The circular brass plaque, numbered CHS 3, is set on top of a concrete pad support for South Arm Cantilever conveyor. Rocky Point RM 3. |
Benchmark Relationships
Datum of data is tide gauge zero.
Tide Gauge Zero (TGZ) = 6.158m below CHS 1 (1986-1988).
Quality Assessment
Comment
The daily and monthly means reveal no apparent reference level changes or trends. However, comparisons with Cocos Island suggest a reference level shift of about +10 cm for July - October, 1987.
| Year | CI(%) | QI(%) | Missing Data | Replaced Gaps or Bad Data | Questionable Fluctuations |
|---|---|---|---|---|---|
| 1986 | 26 | 26 | none | none | none |
| 1987 | 55 | 55 | 72-108,161-206 | none | none |
| 1990 | 33 | 33 | 275-299 | none | none |
| 1991 | 67 | 67 | 7-35,95-144 | none | none |
