The nodal dependence of long-period ocean tides in the Drake Passage
<p>Almost three decades of bottom pressure recorder (BPR) measurements at the Drake Passage, and 31 years of hourly tide gauge data from the Vernadsky Research Base on the Antarctic Peninsula, have been used to investigate the temporal and spatial variations in this region of the three main...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2018-07-01
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| Series: | Ocean Science |
| Online Access: | https://www.ocean-sci.net/14/711/2018/os-14-711-2018.pdf |
| _version_ | 1818876207145418752 |
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| author | P. L. Woodworth A. Hibbert |
| author_facet | P. L. Woodworth A. Hibbert |
| author_sort | P. L. Woodworth |
| collection | DOAJ |
| description | <p>Almost three decades of bottom pressure recorder (BPR) measurements at the
Drake Passage, and 31 years of hourly tide gauge data from the Vernadsky
Research Base on the Antarctic Peninsula, have been used to investigate the temporal and
spatial variations in this region of the three main long-period tides Mf, Mm
and Mt (in order of decreasing amplitude, with periods of a fortnight, a
month and one-third of a month, respectively). The amplitudes of Mf and Mt, and
the phase lags for all three constituents, vary over the nodal cycle (18.61 years)
in essentially the same way as in the equilibrium tide, so confirming
the validity of Doodson's <q>nodal factors</q> for these constituents. The
amplitude of Mm is found to be essentially constant, and so inconsistent at
the 3<i>σ</i> level from the ±13 % (or ∼ ±0.15 mbar)
anticipated variation over the nodal cycle, which can probably be
explained by energetic non-tidal variability in the records at monthly
timescales and longer. The north–south differences in amplitude for all three
constituents are consistent with those in a modern ocean tide model (FES2014),
as are those in phase lag for Mf and Mt, while the phase
difference for Mm is smaller than in the model. BPR measurements are shown to
be considerably superior to coastal tide gauge data in such studies, due to
the larger proportion of non-tidal variability in the latter. However,
correction of the tide gauge records for non-tidal variability results in the
uncertainties in nodal parameters being reduced by a factor of 2 (for Mf at
least) to a magnitude comparable (approximately twice) to those obtained from
the BPR data.</p> |
| first_indexed | 2024-12-19T13:38:43Z |
| format | Article |
| id | doaj.art-865916e2754c4abbb11e546d9b1821a2 |
| institution | Directory Open Access Journal |
| issn | 1812-0784 1812-0792 |
| language | English |
| last_indexed | 2024-12-19T13:38:43Z |
| publishDate | 2018-07-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Ocean Science |
| spelling | doaj.art-865916e2754c4abbb11e546d9b1821a22022-12-21T20:19:04ZengCopernicus PublicationsOcean Science1812-07841812-07922018-07-011471173010.5194/os-14-711-2018The nodal dependence of long-period ocean tides in the Drake PassageP. L. Woodworth0A. Hibbert1National Oceanography Centre, Joseph Proudman Building, 6 Brownlow Street, Liverpool, L3 5DA, UKNational Oceanography Centre, Joseph Proudman Building, 6 Brownlow Street, Liverpool, L3 5DA, UK<p>Almost three decades of bottom pressure recorder (BPR) measurements at the Drake Passage, and 31 years of hourly tide gauge data from the Vernadsky Research Base on the Antarctic Peninsula, have been used to investigate the temporal and spatial variations in this region of the three main long-period tides Mf, Mm and Mt (in order of decreasing amplitude, with periods of a fortnight, a month and one-third of a month, respectively). The amplitudes of Mf and Mt, and the phase lags for all three constituents, vary over the nodal cycle (18.61 years) in essentially the same way as in the equilibrium tide, so confirming the validity of Doodson's <q>nodal factors</q> for these constituents. The amplitude of Mm is found to be essentially constant, and so inconsistent at the 3<i>σ</i> level from the ±13 % (or ∼ ±0.15 mbar) anticipated variation over the nodal cycle, which can probably be explained by energetic non-tidal variability in the records at monthly timescales and longer. The north–south differences in amplitude for all three constituents are consistent with those in a modern ocean tide model (FES2014), as are those in phase lag for Mf and Mt, while the phase difference for Mm is smaller than in the model. BPR measurements are shown to be considerably superior to coastal tide gauge data in such studies, due to the larger proportion of non-tidal variability in the latter. However, correction of the tide gauge records for non-tidal variability results in the uncertainties in nodal parameters being reduced by a factor of 2 (for Mf at least) to a magnitude comparable (approximately twice) to those obtained from the BPR data.</p>https://www.ocean-sci.net/14/711/2018/os-14-711-2018.pdf |
| spellingShingle | P. L. Woodworth A. Hibbert The nodal dependence of long-period ocean tides in the Drake Passage Ocean Science |
| title | The nodal dependence of long-period ocean tides in the Drake Passage |
| title_full | The nodal dependence of long-period ocean tides in the Drake Passage |
| title_fullStr | The nodal dependence of long-period ocean tides in the Drake Passage |
| title_full_unstemmed | The nodal dependence of long-period ocean tides in the Drake Passage |
| title_short | The nodal dependence of long-period ocean tides in the Drake Passage |
| title_sort | nodal dependence of long period ocean tides in the drake passage |
| url | https://www.ocean-sci.net/14/711/2018/os-14-711-2018.pdf |
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