Swell waves at Saint Helena related to distant storms
Abstract This paper discusses the relationship between a frequency‐time plot of energy density of swell, from records taken at St Helena in December 1970 and January 1971, and meteorological records of distant storms. A similar exercise in 1969 had suggested that some of the swells originated from t...
| Published in: | Quarterly Journal of the Royal Meteorological Society |
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| Main Authors: | , , , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Wiley
1977
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| Subjects: | |
| Online Access: | http://dx.doi.org/10.1002/qj.49710343810 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fqj.49710343810 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/qj.49710343810 |
| Summary: | Abstract This paper discusses the relationship between a frequency‐time plot of energy density of swell, from records taken at St Helena in December 1970 and January 1971, and meteorological records of distant storms. A similar exercise in 1969 had suggested that some of the swells originated from the southern hemisphere, even possibly from the Pacific Ocean, but wave amplitudes were all very low. Higher waves were recorded in the present exercise, but all the major events in the energy spectra were attributable to northern hemisphere storms, a few minor events only to the southern hemisphere, and none to the Pacific Ocean. It is concluded that large northwesterly storms in the area southeast of Newfoundland are probably responsible for the spectacular ‘rollers’ which are frequently reported from St Helena. |
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