HELGEROA

Documentation added 1991-06-11

Helgeroa 040/310 RLR(1966) is 8.3m below BM F38 N29

Documentation added 1995-03-30

Tide gauge network modernised, new equipment installed in 1987

Documentation added 2009-01-28

Following the input of revised data values station made Metric awaiting datum information.

Documentation added 2009-04-06

2007/8 mean sea level values entered as METRIC only awaiting confirmation of a datum query.

Documentation added 2009-10-27

The Norwegian Mapping Authority have revised their datasets. Whole dataset is now referred to TGBM F38 N29 which is 2.312m above TGZ. As a result RLR has been re-calculated year chosen was 1984 RLR value before 6.988.Revised RLR factor is now 6.088m

Documentation added 2012-09-05

For information on sea level rise along the Norwegian coast see paper "Contributions to sea level variability along the Norwegian coast for 1960-2010" by K. Richter, J.E.O. Nilsen and H. Drange.

Documentation added 2015-11-17

The PSMSL has been notified by the Norwegian Authority that the tide gauge at Helgeroa is sinking. The rate of sinking has been confirmed as 0.22mm/year. With the supply of the 2014 sea level data a revised dataset beginning January 1988 has been supplied. Future data will be supplied with the correction applied.

Documentation added 2018-01-25

Monthly mean value for December 1987 has been updated using values supplied by the Norwegian Mapping Authority.