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