| Records |
| Author |
Anzhou Cao, Zheng Guo, Xiaoyu Qi, Peiliang Li, Hailun He |
| Title |
Seasonal and nodal variations of predominant tidal constituents in the global ocean |
Type |
Journal |
| Year |
2021 |
Publication |
Continental Shelf Research |
Abbreviated Journal |
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| Volume |
217 |
Issue |
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Pages |
104372 |
| Keywords |
Fitting Modified two-step harmonic analysis Nodal modulation Seasonal variation Tide gauge Tides |
| Abstract |
Tides are one of the basic types of ocean water motions. Previous studies have reported that the M2 constituent exhibits seasonal variations (annual cycles) in some regions. However, based on the newly proposed method of modified two-step harmonic analysis (HA) and its application at 240 global tide gauges, we find that the M2 constituent as well as the S2 and K1 do not have significant seasonal variations at these tide gauges. The seasonal variations of the M2 constituent reported in previous studies are caused by its satellites, the H1 and H2 constituents, which are not resolved in these studies due to the short time window (one month or three months) used in HA. Because the frequency of the H1 (H2) constituent is equal to that of the M2 minus (plus) the frequency of annual cycles, the superposition of the M2, H1 and H2 constituents with constant amplitudes is equivalent to the M2 constituent with seasonally varying amplitudes. Compared with the new method, some adaptations to traditional HA aiming to capture variations in amplitudes and phase lags of constituents have some limitations, because they either neglect some satellites of the major constitutes or introduce spurious fluctuations resulting from an unreasonably large number of independent points. The nodal modulations of predominant constituents are also explored in this study. On the global scale, the nodal modulations of the M2, K1 and O1 constituents agree with the theoretical predictions, except a cold spot region with reduced nodal modulation in the Gulf of Maine and a hot spot region with enhanced nodal modulation in the South China Sea for the M2. Nodal modulation is also found for the S2 constituent (in theory, the S2 has no nodal modulation), which is 0.8% averaged at 164 tide gauges where the S2 is not too weak. |
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688 |
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| ISSN |
0278-4343 |
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Approved |
yes |
| Call Number |
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Serial |
8032 |
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| Author |
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| Title |
Tide gauges |
Type |
Book |
| Year |
2019 |
Publication |
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Abbreviated Journal |
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| Volume |
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Issue |
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Pages |
31-34 |
| Keywords |
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| Abstract |
Tide gauge measurements provide data for routine tidal predictions in ports as well as for extreme events such as storm surges and tsunamis. Along with satellite altimeter measurements, tide gauges also provide measurements used for sea-level rise estimates. This is particularly important for impact assessment in low-lying coastlines of south Asia as well as islands such as the Maldives in the Indian Ocean. |
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688 |
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yes |
| Call Number |
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Serial |
8033 |
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| Author |
David Byrne, Jeff Polton, Colin Bell |
| Title |
Creation of a global tide analysis dataset: Application of NEMO and an offline objective analysis scheme |
Type |
Journal |
| Year |
2021 |
Publication |
Journal of Operational Oceanography |
Abbreviated Journal |
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| Volume |
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Issue |
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Pages |
1-14 |
| Keywords |
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| Abstract |
The accurate prediction of tides is vital for the operation of many industries, early warning of coastal flooding and scientific understanding of ocean processes. In this paper, we describe the creation method of a global dataset of tidal harmonics using NEMO (Nucleus for European Modelling of the Ocean) for the first time and an offline objective analysis scheme. Data are assimilated as part of a post-processing step, reducing the computational resources required. A reduced ensemble of tidal harmonics is generated, where each member is run for a shorter period of time than a central background state. This ensemble is used to estimate a single background covariance state, which is used for analysis. Output is validated using an ensemble of objective analyses. For each ensemble member, random selections of observations are omitted and validation is performed at these locations. Improvements in both Mean Absolute Error (MAE) and correlation coefficients (R2) are seen across all 6 of the largest diurnal and semi-diurnal constituents. MAEs in amplitude and phase are reduced by up to 78% and 89%, respectively, and correlations by as much as 0.14. In addition, the majority of locations (between 70 and 80%) see significant improvement. |
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688 |
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Edition |
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| ISSN |
1755-876X |
ISBN |
1755-876X |
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Approved |
yes |
| Call Number |
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Serial |
8338 |
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| Author |
Pengcheng Wang, Natacha B. Bernier, Keith R. Thompson, Tsubasa Kodaira |
| Title |
Evaluation of a global total water level model in the presence of radiational S2 tide |
Type |
Journal |
| Year |
2021 |
Publication |
Ocean Modelling |
Abbreviated Journal |
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| Volume |
168 |
Issue |
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Pages |
101893 |
| Keywords |
NEMO Radiational and gravitational tide Storm surge Tidal nudging Total water level |
| Abstract |
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688 |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
1463-5003 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
8356 |
| Permanent link to this record |
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| Author |
Tranchant Y.-T., M. Cancet, E. Sahuc, S. Millet, F. Lyard, L. Testut, V. Ballu, C. Chupin, G. Dibarboure, N. Picot, O. Laurain, P. Bonnefond. |
| Title |
High-resolution coastal modeling in Kerguelen Island for CAL/VAL activities |
Type |
Peer-reviewed symposium |
| Year |
2020 |
Publication |
Ocean Surface Topography Science Team Meeting (OSTST) meeting, 19-23 October 2020, Virtual |
Abbreviated Journal |
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688 |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
8371 |
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| Author |
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| Title |
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Type |
Journal |
| Year |
2021 |
Publication |
Communications Earth & Environment |
Abbreviated Journal |
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| Volume |
2 |
Issue |
1 |
Pages |
1-8 |
| Keywords |
Physical oceanography |
| Abstract |
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| Programme |
688 |
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Series Issue |
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Edition |
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| ISSN |
2662-4435 |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
8387 |
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| Author |
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| Title |
Minute Sea-Level Analysis (MISELA): a high-frequency sea-level analysis global dataset |
Type |
Journal |
| Year |
2021 |
Publication |
Earth system science data |
Abbreviated Journal |
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| Volume |
13 |
Issue |
8 |
Pages |
4121-4132 |
| Keywords |
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| Programme |
688 |
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Edition |
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| ISSN |
1866-3508 |
ISBN |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
8392 |
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| Author |
Yushiro Fujii, Kenji Satake, Shingo Watada, Tung-Cheng Ho |
| Title |
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Type |
Journal |
| Year |
2021 |
Publication |
Pure and Applied Geophysics |
Abbreviated Journal |
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| Volume |
178 |
Issue |
12 |
Pages |
4777-4796 |
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688 |
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Edition |
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| ISSN |
1420-9136 |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
8411 |
| Permanent link to this record |
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| Author |
Téchiné P., L. Testut, M. Calzas, A. Guillot, C. Drezen, C. Brachet, L. Fichen, T. Donal, V. Kérébel. |
| Title |
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Type |
Peer-reviewed symposium |
| Year |
2022 |
Publication |
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688 |
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Approved |
yes |
| Call Number |
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Serial |
8478 |
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Type |
Report |
| Year |
2018 |
Publication |
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Abbreviated Journal |
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688 |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
8490 |
| Permanent link to this record |
