Ammassalik (Greenland) Site History

History Summary

Station NameAmmassalik, Greenland
Latitude65° 30.0' N
Longitude037° 00.0' W
CountryDenmark
GLOSS No.228
Time ReferenceGMT (00-23 hours)
Contributor1990-1999 Royal Danish Administration of Navigation & Hydrography
Instrument TypePressure gauge
Site of Gauge 
Observational Periods1973, 1990 - 1999
Reference LevelAll data are referred to LAT which is Chart Datum for Greenland.

Tide Gauge Benchmark (TGBM) Description

TGBM 5298.6cm below 'bronze' mark near Ammassalik town-cairn.

Also benchmark 4321.1cm below 'bronze' mark about 10m from church entrance.

Quality Assessment

Comments

All data are corrected for atmospheric pressure. Salinity not measured, sea level elevation calculated from pressure using a sea water density based on measured temperature and a salinity of 31.5 ppt.

All pre-1995 data have been adjusted by -119cm to refer to LAT.

The data contain significant energy of one to three day periods related to atmospheric and oceanographic events.

1996 data have been collected with a 15 minutes interval, but it slips 1 minute approximately every month.

In 1997, possible datum shift over day Nos. 215 to 225.

In 1998, from day Nos. 233-365, there are non-uniform timing errors and possible instrument problems.

Most of 1999 suffers from timing errors, perhaps due to instrument problems.

YearCompleteness
Index (%)
Questionable Fluctuations (In day Nos.)
and Missing Data (Gaps >6 hours)
199099None
Gap from 1990/12/19 at 17.00 to 1990/12/23 at 13.00
199156None
Gap from 1991/01/17 at 21.00 to 1991/02/09 at 18.00
Gap from 1991/06/29 at 04.00 to 1991/07/01 at 17.00
Gap from 1991/08/05 at 01.00 to 1991/08/09 at 14.00
Gap from 1991/08/14 at 12.00 to 1991/11/12 at 20.00
Gap from 1991/11/13 at 21.00 to 1991/11/17 at 04.00
Gap from 1991/11/22 at 10.00 to 1991/12/02 at 11.00
Gap from 1991/12/09 at 18.00 to 1991/12/17 at 18.00
199281None
Gap from 1992/02/02 at 11.00 to 1992/02/02 at 22.00
Gap from 1992/04/05 at 13.00 to 1992/04/05 at 20.00
Gap from 1992/04/22 at 13.00 to 1992/05/01 at 12.00
Gap from 1992/05/27 at 17.00 to 1992/06/05 at 19.00
Gap from 1992/06/11 at 21.00 to 1992/07/06 at 13.00
Gap from 1992/07/16 at 22.00 to 1992/07/19 at 13.00
Gap from 1992/08/08 at 15.00 to 1992/08/10 at 17.00
Gap from 1992/08/18 at 21.00 to 1992/08/30 at 14.00
Gap from 1992/09/07 at 14.00 to 1992/09/10 at 17.00
Gap from 1992/09/17 at 07.00 to 1992/09/18 at 17.00
Gap from 1992/12/19 at 22.00 to 1992/12/22 at 18.00
199369None
Gap from 1993/01/07 at 04.00 to 1993/01/07 at 18.00
Gap from 1993/01/16 at 01.00 to 1993/01/21 at 14.00
Gap from 1993/03/14 at 04.00 to 1993/03/21 at 15.00
Gap from 1993/04/09 at 16.00 to 1993/05/09 at 14.00
Gap from 1993/05/09 at 16.00 to 1993/05/25 at 14.00
Gap from 1993/05/29 at 05.00 to 1993/06/03 at 16.00
Gap from 1993/06/16 at 20.00 to 1993/06/23 at 16.00
Gap from 1993/07/04 at 13.00 to 1993/07/10 at 14.00
Gap from 1993/07/19 at 05.00 to 1993/07/25 at 15.00
Gap from 1993/08/05 at 05.00 to 1993/08/06 at 10.00
Gap from 1993/08/08 at 13.00 to 1993/09/06 at 14.00
199499None
Gap from 1994/08/16 at 15.00 to 1994/08/17 at 20.00
1995100None
1996100None
199796030 and 070
Gap from 1997/01/29 at 09.48 to 1997/01/29 at 18.48
Gap from 1997/02/02 at 01.18 to 1997/02/02 at 13.03
Gap from 1997/02/17 at 17.48 to 1997/02/19 at 18.03
Gap from 1997/04/12 at 09.48 to 1997/04/12 at 16.33
Gap from 1997/05/16 at 06.33 to 1997/05/25 at 12.33
199878155, 156, 168, 233-365
Gap from 1998/02/26 at 13.15 to 1998/05/16 at 10.15
199965001-105,147-237
Gap from 1999/08/25 at 11.24 to 1999/12/31 at 23.54