Preprints
https://doi.org/10.5194/essd-2022-218
https://doi.org/10.5194/essd-2022-218
 
05 Jul 2022
05 Jul 2022
Status: this preprint is currently under review for the journal ESSD.

Reanalyses of Maskelyne’s Tidal Data at St. Helena in 1761

Philip Leslie Woodworth and John McLauchlan Vassie Philip Leslie Woodworth and John McLauchlan Vassie
  • National Oceanography Centre, Joseph Proudman Building, 6 Brownlow Street, Liverpool L3 5DA, United Kingdom

Abstract. The construction of an electronic data set of the tidal measurements made at St. Helena in 1761 by Nevil Maskelyne is described. These data were first analysed by Cartwright (1971, 1972) in papers which have importance within studies of changing tides. However, Cartwright’s data files were never archived for the benefit of other researchers, demonstrating that ‘old data’ at risk can sometimes take the form of electronic rather than paper records. In the present paper, the newly digitised Maskelyne data have been reanalysed by several techniques in order to obtain an updated impression of whether the tide has changed at that location in over two and a half centuries. Our main conclusion, consistent with that of Cartwright, is that the major tidal constituent (M2) has changed little. However, the results of the various techniques demonstrate how difficult it is to obtain reliable conclusions for the smaller constituents.

Philip Leslie Woodworth and John McLauchlan Vassie

Status: open (until 30 Aug 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • EC1: 'Comment on essd-2022-218', Giuseppe M.R. Manzella, 08 Jul 2022 reply
    • AC1: 'Reply on EC1', Philip Woodworth, 11 Jul 2022 reply
  • RC1: 'Comment on essd-2022-218', Giuseppe M.R. Manzella, 09 Jul 2022 reply
    • AC2: 'Reply on RC1', Philip Woodworth, 11 Jul 2022 reply
    • RC2: 'Reply on RC1', Laurent Testut, 02 Aug 2022 reply
      • AC3: 'Reply on RC2', Philip Woodworth, 09 Aug 2022 reply

Philip Leslie Woodworth and John McLauchlan Vassie

Data sets

Maskelyne sea level observations from the Island of St. Helena in 1761 Woodworth, P. L. and Vassie, J. M. https://doi.org/10.5285/e0f2b6ea-d11d-3102-e053-6c86abc073ab

Philip Leslie Woodworth and John McLauchlan Vassie

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Short summary
An electronic data set of tidal measurements at St. Helena in 1761 by Nevil Maskelyne is described. These data were first analysed by Cartwright in papers on changing tides but his data files were never archived. The now newly digitised Maskelyne data have been reanalysed in order to obtain an updated impression of whether the tide has changed at that location in over two and a half centuries. Our main conclusion is that the major tidal constituent (M2) has changed little.