Articles | Volume 14, issue 9
Earth Syst. Sci. Data, 14, 4387–4396, 2022
https://doi.org/10.5194/essd-14-4387-2022
Earth Syst. Sci. Data, 14, 4387–4396, 2022
https://doi.org/10.5194/essd-14-4387-2022
Data description paper
26 Sep 2022
Data description paper | 26 Sep 2022

Reanalyses of Maskelyne's tidal data at St. Helena in 1761

Philip L. Woodworth and John M. Vassie

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Cited articles

Cartwright, D. E.: Some further results of the “response method” of tidal analysis, Proceedings of the International Hydrographic Bureau Symposium on Tides held in Monaco, April 1967, UNESCO publication, 195–202, 1969. 
Cartwright, D. E.: Tides and waves in the vicinity of Saint Helena, Philos. T. R. Soc. London, A, 270, 603–649, https://doi.org/10.1098/rsta.1971.0091, 1971. 
Cartwright, D. E.: Some ocean tide measurements of the eighteenth century, and their relevance today, P. R. Soc. Edinb. B: Biological Sciences, 72, 331–339, https://doi.org/10.1017/S0080455X00001892, 1972. 
Cartwright, D. E., Spencer, R., Vassie, J. M., and Woodworth, P. L.: The tides of the Atlantic Ocean, 60N to 30S, Philos. T. R. Soc. London, A, 324, 513–563, https://doi.org/10.1098/rsta.1988.0037, 1988. 
Cartwright, D. E., Woodworth, P. L., and Ray, R. D.: Manuel Johnson's tide record at St. Helena, Hist. Geo Space. Sci., 8, 9–19, https://doi.org/10.5194/hgss-8-9-2017, 2017. 
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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.