Christmas (Australia) Data Quality Assessment

Quality Assessment of sea level data by the TOGA Sea Level Center/National Oceanographic Data Centre Joint Archive for Sea Level.

Station Christmas Latitude 10° 25.0' S
Country Australia Longitude 105° 40.0' E
JASL # 170A Time Meridian 105E (GMT + 7 hr)
GLOSS # 047 TOGA # I049
NODC # 31100501
Contributor: CSIRO Division of Oceanography GPO Box 1538 Hobart, Tasmania 7001
Originator: Same
Original Data: Digital
Instrument Type: Leupold Stevens analog-to-digital recorder
Digitzd Interval: 6 minute
Present Data: Hourly, daily, and monthly values obtained by:
Hourly: Three-point Hanning centred on the hour
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: 28 September 1986 - 09 October 1987
Gaps > 1 Month: 13 March - 18 April 1987; 10 June - 25 July 1987
Time Reference: GMT (hours 00-23)
Space-filler Flag: -9999
Units: Millimeters
Missing Data Flag: 99999
Reference Level: All heights have been referred to the station tide staff zero which is linked to fixed bench marks.
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.