=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 11-Jun-1991
Port Lyttelton      690/021 RLR(1963) is 10.1m below BM UD40
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 28-Apr-1995
1961-62 revised, 28th April 1995
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 17-Jan-2003
New data from John Hannah added 17/01/03 which supercedes old data. New data does not have any missing days information. Old data has been backed up.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 17-Jan-2003
New data from John Hannah was for Auckland II, Dunedin II, Lyttelton II and Wellington II.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 17-Oct-2005
There is a new John Hannah paper referring to New Zealand data for Wellington, Dunedin, Lyttelton and Auckland. The reference is: "An updated analysis of long-term sea level change in New Zealand." Geophysical Research Letters, V31, L03307, doi:10.1029/2003GL019166 (2004).
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 07-Oct-2008
Data received from Glen Rowe of LINZ for 1995-2007 Previous data held ends in 1964. Bench mark details were clarified. Bench mark at Port Lyttelton remains BM UD 40 - see email of 7.10.08.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 02-Sep-2014
There is currently no data for Lyttelton for 2013 while LINZ investigate possible problems with the tide gauge.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 19-Aug-2015
With the supply of the 2014 sea level data Glen Rowe from LINZ also send revised data values Port Lyttelton for 2010-2013 to ensure that the post earthquake values have been corrected to the historic zero datum.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 28-Jun-2018
The Kaikoura earthquake of 13 November 2016 at 23:02 impacted a number of stations in the central part of New Zealand. For this reason hourly values from 14th November 00:00hrs have been adjusted by LINZ. The adjustment at Lyttelton is -0.030m
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 25-Aug-2020
The adjustment due to the Kaikōura earthquake of 2016 has been removed as relative sea level series should include land movement.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 23-Aug-2021
A revised copy of the New Zealand data values for Port Lyttelton has been received from the data supplier the Land Information New Zealand (LINZ). The revised data begins from 2014. This exercise has been carried out to correct some anomalies with the high frequency data.
Adjustment has also been applied to the data to account for the Kaikoura earthquake by creating a new datum TGZ December 2016 4.371m below benchmark UD40.
Consequently the Metric data has had the effect of Kaikoura removed but the effect of the earthquake is evident in the RLR data.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 23-Oct-2024
LINZ have informed us that the station was relocated on 4 September 2020, and since then the tide gauge zero has been Chart Datum, 4.478 m below UD40. RLR data from September 2020 onward has been recomputed.

