Ponta Delgada (Azores) Site History

History Summary

Station Name	Ponta Delgada, Azores
Latitude	37° 44.1' N
Longitude	025° 40.3' W
Country	Portugal
GLOSS No.	245
Time Reference	GMT (00-23 hours)
Contributor	1978-1991 Portuguese Hydrographic Institute 1993-present NOAA/NOS
Instrument Type	(1978-1991) Analog to digital recorder (1993-present) Next Generation Water Level Measurement System, acoustic sensor
Site of Gauge
Observational Periods	1978-1980, 1982-present
Reference Level	All data are referred to TGZ and linked into historic fixed benchmarks.

Tide Gauge Benchmark (TGBM) Description

BM Control - NP - benchmark bolt at the root of pier

Auxiliary Benchmarks

MN 7/83 is 2.748m above Chart Datum
MC is 2.812m above Chart Datum

Benchmark Relationships

Tide gauge zero (TGZ) = Portuguese Hydrographic Institute Chart Datum
TGZ = 3.000m below NP

Quality Assessment

Comments

The daily or monthly means do not reveal any obvious reference level shifts.

Most questionable fluctuations are related to timing problems with the gauge. Time shift of -1hr applied to 02/02/94(01) - 02/04/94(00)

Year	Completeness Index (%)	Questionable Fluctuations(in day Nos.) and Missing Data (Gaps >6 hours)
1978	100	199-200
1979	91	2,218,277-280,294,353-354 Gap from 1979/02/20 at 23.00 to 1979/02/26 at 22.00 Gap from 1979/04/22 at 23.00 to 1979/04/26 at 22.00 Gap from 1979/07/22 at 23.00 to 1979/07/31 at 22.00 Gap from 1979/08/15 at 23.00 to 1979/08/20 at 22.00 Gap from 1979/08/31 at 23.00 to 1979/09/03 at 22.00 Gap from 1979/12/08 at 23.00 to 1979/12/15 at 22.00
1980	92	18,222-226,237-243 Gap from 1980/01/01 at 23.00 to 1980/01/07 at 22.00 Gap from 1980/01/18 at 23.00 to 1980/01/21 at 22.00 Gap from 1980/02/08 at 23.00 to 1980/02/11 at 22.00 Gap from 1980/02/19 at 23.00 to 1980/02/25 at 22.00 Gap from 1980/02/28 at 23.00 to 1980/03/06 at 22.00 Gap from 1980/07/19 at 23.00 to 1980/07/24 at 22.00
1982	99	213,221-222 Gap from 1982/08/23 at 23.00 to 1982/08/25 at 22.00
1983	96	121 Gap from 1983/04/10 at 23.00 to 1983/04/16 at 22.00 Gap from 1983/09/20 at 23.00 to 1983/10/01 at 22.00
1984	51	225-229 Gap from 1984/01/11 at 23.00 to 1984/04/03 at 22.00 Gap from 1984/04/24 at 23.00 to 1984/07/12 at 22.00 Gap from 1984/07/30 at 23.00 to 1984/08/07 at 22.00 Gap from 1984/09/21 at 23.00 to 1984/10/01 at 22.00
1985	78	None Gap from 1985/01/17 at 23.00 to 1985/01/25 at 22.00 Gap from 1985/02/07 at 23.00 to 1985/03/11 at 22.00 Gap from 1985/04/15 at 23.00 to 1985/04/24 at 22.00 Gap from 1985/09/06 at 23.00 to 1985/09/16 at 22.00 Gap from 1985/11/19 at 23.00 to 1985/12/02 at 22.00 Gap from 1985/12/11 at 23.00 to 1985/12/20 at 22.00
1986	73	None Gap from 1986/01/29 at 23.00 to 1986/02/12 at 22.00 Gap from 1986/03/26 at 23.00 to 1986/03/31 at 22.00 Gap from 1986/04/15 at 23.00 to 1986/04/27 at 22.00 Gap from 1986/05/11 at 23.00 to 1986/06/27 at 22.00 Gap from 1986/07/11 at 23.00 to 1986/07/15 at 22.00 Gap from 1986/08/03 at 23.00 to 1986/08/11 at 22.00 Gap from 1986/11/12 at 23.00 to 1986/11/20 at 22.00
1987	98	None Gap from 1987/01/23 at 23.00 to 1987/01/27 at 22.00 Gap from 1987/02/16 at 23.00 to 1987/02/19 at 22.00
1988	99	None Gap from 1988/11/25 at 23.00 to 1988/11/29 at 22.00
1989	98	None Gap from 1989/01/27 at 23.00 to 1989/01/31 at 22.00 Gap from 1989/02/23 at 23.00 to 1989/02/27 at 22.00
1990	87	None Gap from 1990/02/21 at 01.00 to 1990/02/25 at 00.00 Gap from 1990/04/12 at 01.00 to 1990/04/17 at 00.00 Gap from 1990/04/23 at 01.00 to 1990/05/12 at 00.00 Gap from 1990/06/09 at 01.00 to 1990/06/14 at 00.00 Gap from 1990/07/04 at 01.00 to 1990/07/11 at 00.00 Gap from 1990/08/16 at 01.00 to 1990/08/19 at 00.00
1991	45	None Gap from 1991/01/08 at 01.00 to 1991/01/18 at 00.00 Gap from 1991/02/27 at 01.00 to 1991/03/07 at 00.00
1993	44	None
1994	100	None
1995	100	None
1998	98	None Gap from 1998/01/01 at 00.00 to 1998/01/07 at 00.00 Gap from 1998/10/27 at 05.00 to 1998/10/27 at 19.00 (05)300-(19)300