Ascension Phase 2 Site History

History Summary

Station Name Ascension Phase 2
Latitude 07° 54.0' S
Longitude 014° 23.0' W
Country U.K.
Gloss No 263
Time Reference GMT(00-23 hours)
Contributor Proudman Oceanographic Laboratory,
Joseph Proudman Building,
6 Brownlow Street,
Liverpool,
L3 5DA. U.K.
Observation Period May 1993 - April 2001
Instrument Type B gauge (Woodworth et al. 1996)
Site of Gauge English Bay

Parameters recorded

Period CI(%) Parameters Sample Interval
05 1993 - 11 1993 100 ST,BT,AP,SL,SSP,HTP 15 mins
11 1993 - 01 1995 100 ST,BT,AP,SL,SSP,HTP 15 mins
02 1995 - 10 1995 100 ST,BT,AP,SL,SSP,HTP 15 mins
10 1995 - 05 1996 87 ST,BT,AP,SL,SSP,HTP 15 mins
05 1996 - 03 1997 100 ST,BT,AP,SL,SSP,HTP 15 mins
03 1997 - 06 1998 100 ST,BT,AP,SL,SSP,HTP 15 mins
03 1999 - 09 1999 100 ST,BT,AP,SL,SSP,HTP 15 mins
04 1999 - 06 2000 100 ST,BT,AP,SL,SSP,HTP 15 mins
06 2000 - 04 2001 100 ST,BT,AP,SL,SSP,HTP 15 mins

where:

Reference Level

The sea Level data are given with respect to 'ASCENSION B-DATUM MAY 1993' until 1998, then with respect to 'ASCENSION B-DATUM MARCH 1999'. The new datum is known relative to the old datum through levelling and is 6.4 cm ABOVE the old datum.

Quality Assessment

All data have been tidally analysed and constants and residuals checked. Records have been visually inspected for spikes, timing and datum shifts.

In the series 1999-2000 and 2000-2001, the half tide sensor records values about 0.3 decibars below the sub surface (total) pressure sensor.

Period Parameters Comments
05 1993 - 11 1993 All None
11 1993 - 01 1995 All None
02 1995 - 10 1995 HTP Marked data: 49-50,52-54,126-128,156-157
10 1995 - 05 1996

All

SL

Missing data: (1996)26-40,46-59

Marked data: (1996)44

05 1996 - 03 1997 All None
03 1997 - 06 1998 All None
03 1999 - 09 1999 All None
04 1999 - 06 2000 All None
06 2000 - 04 2001

SL

BT

HTP


Marked data: (2000)346 (2001)026,073

Marked data: (2000)240

Missing data: (2001) 073
Marked data: (2000)216-217,241-247,255-259,270,272-273,287-291,299-304,315-319,329-332,347-349 (2001)008-013,037-041,053-060,066-074,080-087

Reference

Woodworth, P.L., Vassie, J.M., Spencer, R. and Smith, D.E. 1996.
Precise datum control for pressure tide gauges. Marine Geodesy, 19(1), 1-20.