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Tabulations of ocean tide at St. Helena, 1826-1827.

These data are made available under UK Open Government Licence with NERC preamble

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Tabulations of ocean tide at St. Helena, 1826-1827.

Author(s) Cartwright D.E. (1); Woodworth P.L. (2); Ray R.D. (3)

(1) National Oceanography Centre, Southampton; (2) National Oceanography Centre, Liverpool; (3) NASA Goddard Space Flight Center

Subject elevation, oceans

This dataset contains tabulations of the heights and times of tidal high and low water at St. Helena from 1 October 1826 to 31 October 1827. The tide was recorded by an instrument designed by Manuel Johnson, a future President of the Royal Astronomical Society, while waiting for an observatory to be built. The tabulations in this dataset were obtained by inspection of photographs of Johnson's tabulation sheets that are held in the archive RGO 6/500 in the Royal Greenwich Observatory collection at Cambridge University Library. It is an important record in the history of tidal science, as the only previous measurements at St. Helena had been those made by Nevil Maskelyne in 1761, and there were to be no other systematic measurements until the late 20th century. Johnson's tide gauge, of a curious but unique design, recorded efficiently the height of every tidal high and low water for at least 13 months, in spite of requiring frequent re-setting. These heights compare very reasonably with a modern tidal synthesis based on present-day tide gauge measurements from the same site. Johnson's method of timing is unknown, but his calculations of lunar phases suggest that his tidal measurements were recorded in Local Apparent Time. Unfortunately, the recorded times are found to be seriously and variably lagged by many minutes. Johnson's data have never been fully published, but his manuscripts have been safely archived and are available for inspection at Cambridge University. His data have been converted to computer files as part of this study for the benefit of future researchers. This dataset supports the paper "Cartwright, D.E.; Woodworth, P.L.; Ray, R.D.. 2017 Manuel Johnson's tide record at St. Helena. History of Geo- and Space Sciences". Richard Ray (National Aeronautics and Space Administration) and Philip Woodworth (National Oceanography Centre) modified and added figures to David E. Cartwright's original draft paper and sections of text have been updated, but otherwise the paper is as he intended it. This work was undertaken when Philip Woodworth was an Honorary Research Fellow at the National Oceanography Centre in Liverpool in receipt of an Emeritus Fellowship from the Leverhulme Trust. Part of this work was funded by UK Natural Environment Research Council National Capability funding.

Temporal coverage 01 October 1826 - 31 October 1827
Spatial coverage South Atlantic Ocean
File format Delimited, Text or Plaintext
Language English
Discovery metadata record Link to the related European Directory of Marine Environmental Data (EDMED) record
Publisher British Oceanographic Data Centre - Natural Environment Research Council, UK
Publication date 21 March 2017
Digital Object Identifier (DOI) doi:10.5285/4b2b52d7-ffd9-2473-e053-6c86abc0103b
Short DOI doi:10/b4p4
Citation text Cartwright D.E.; Woodworth P.L.; Ray R.D.(2017). Tabulations of ocean tide at St. Helena, 1826-1827. British Oceanographic Data Centre - Natural Environment Research Council, UK. doi:10.5285/4b2b52d7-ffd9-2473-e053-6c86abc0103b