An investigation of ocean tides derived from along‐track altimetry

Tierney, Craig; Parke, Michael; Born, George H.

doi:10.1029/98jc00448

Cited by 26 publications

(12 citation statements)

References 26 publications

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“…HYCOM diurnal tidal amplitudes obtained from hourly samples satisfy this theoretical constraint (Figure 8b). However, as discussed in the literature [ Tierney et al , 1998; Carrère et al , 2004; Ray and Byrne , 2010], the altimetric analysis (Figure 8a) shows features that result from the leakage of mesoscale activity into tidal frequency estimates. This leakage is visually evident across all the diurnal constituents, where internal tides do not propagate, and it can be seen in the semidiurnal constituents as well.…”

Section: Model‐data Comparisonsmentioning

confidence: 68%

An evaluation of the barotropic and internal tides in a high‐resolution global ocean circulation model

Shriver¹,

Arbic²,

Richman³

et al. 2012

J. Geophys. Res.

100

149

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[1] Global comparisons of barotropic and internal tides generated in an eddy-resolving ocean circulation model are made with tidal estimates obtained from altimetric sea surface heights and an altimetry-constrained tide model. As far as we know, our Hybrid Coordinate Ocean Model (HYCOM) simulations shown here and in an earlier paper are the only published high-resolution global simulations to contain barotropic tides, internal tides, the general circulation, and mesoscale eddies concurrently. Comparing the model barotropic tide with a global data-assimilative shallow water tide model shows that the global tidal elevation differences are approximately evenly split between discrepancies in tidal amplitude and phase. Both the model and observations show strong generation of internal tides at a limited number of "hot spot" regions with propagation of beams of energy for thousands of kilometers away from the sources. The model internal tidal amplitudes compare well with observations near these energetic tidal regions. Averaged over these regions, the model and observation internal tide amplitude estimates agree to approximately 15% for the four largest semidiurnal constituents and 23% for the four largest diurnal constituents. Away from the hot spots, the comparison between the model and altimetric amplitude is not as good due, in part, to two problems, errors in the model barotropic tides and overestimation of the altimetric tides in regions of strong mesoscale eddy activity. Examining the general energy distribution of the simulated internal tide is an important first step in the evaluation of internal tides in HYCOM.

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Section: Model‐data Comparisonsmentioning

confidence: 68%

An evaluation of the barotropic and internal tides in a high‐resolution global ocean circulation model

Shriver¹,

Arbic²,

Richman³

et al. 2012

J. Geophys. Res.

100

149

View full text Add to dashboard Cite

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“…For an about 10‐day repeat period of the current Jason‐1 (J1) and the preceding TOPEX/Poseidon (TP) altimetry missions, signals with periods shorter than 20 days are not resolved. They alias into lower frequencies and corrupt altimetry measurements [ Fukumori et al , 1998; Tierney et al , 1998; Stammer et al , 2000]. It becomes very difficult, and sometimes impossible, to tell with certainty which frequency out of a large number of possible aliases is actually contributing to the signal variability.…”

Section: Introductionmentioning

confidence: 99%

Improving the quality of satellite altimetry data over continental shelves

Volkov¹,

Larnicol²,

Dorandeu³

2007

J. Geophys. Res.

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[1] Satellite altimetry has proven to be a useful tool to study oceanic processes in the deep ocean. Over continental shelves, however, the aliasing of unresolved high-frequency signals of tidal and wind-induced origin is the source of long-wavelength errors that corrupt altimetry measurements and limit their use in shallow waters. In 2005, SSALTO/DUACS performed a complete reanalysis of altimeter data to accommodate the latest tidal model (GOT2000) and a correction for the aliased high-frequency signals using a hydrodynamic model MOG2D-G. This paper examines the quality and the performance of the newly released altimetry data over the northwest European shelf. This region is known for complex tides and for frequent storm surges. The newly corrected maps of sea level anomalies were compared with a previous altimetry product. Residual tidal aliasing was analyzed, and the impact of MOG2D-G and GOT2000 models was assessed. Altimeter records were compared with tide gauge measurements. This research showed a significant reduction in the contamination of data by high-frequency aliasing achieved through the use of the aforementioned models. However, aliased shallow-water tidal constituents pose a serious problem, and it is obvious that future tidal corrections should feature local tides. Nonaliased, physical sea level variability was also studied focusing on interannual, seasonal, and intra-annual (periods from 20 days to 1 year) modes. The magnitudes and the contributions of each mode to the total variance were estimated. It was demonstrated that the newly corrected data can successfully be used to study the variability of sea level over continental shelves.Citation: Volkov, D. L., G. Larnicol, and J. Dorandeu (2007), Improving the quality of satellite altimetry data over continental shelves,

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“…Mapping the surface manifestation of open-ocean internal tides has been an especially fruitful use of along-track data (Ray and Mitchum 1996;Zhao and Alford 2009) . Such analyses obviously require multiple years of exactly repeated tracks to e nsure sufficient data to support a tidal in version, so they began to appear only several years after the launch of TIP (Tierney et al 1998;Carrere e t al. 20(4).…”

Section: Introductionmentioning

confidence: 99%

Bottom pressure tides along a line in the southeast Atlantic Ocean and comparisons with satellite altimetry

Ray

Byrne

2010

Ocean Dynamics

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Seafloor pressure records, collected at 11 stations aligned along a single ground track of the Topex/Poseidon and Jason satellites, are analyzed for their tidal content. With very low background noise levels and approximately 27 months of high-quality records, tidal constituents can be estimated with unusually high precision. This includes many high-frequency lines up through the seventh-diurnal band. The station deployment provides a unique opportunity to compare with tides estimated from satellite altimetry, point by point along the satellite track, in a region of moderately high mesoscale variability. That variability can significantly corrupt altimeter-based tide estimates, even with 17 years of data. A method to improve the alongtrack altimeter estimates by correcting the data for nontidal variability is found to yield much better agreement with the bottom-pressure data. The technique should prove useful in certain demanding applications, such as altimetric studies of internal tides.

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An investigation of ocean tides derived from along‐track altimetry

Cited by 26 publications

References 26 publications

An evaluation of the barotropic and internal tides in a high‐resolution global ocean circulation model

An evaluation of the barotropic and internal tides in a high‐resolution global ocean circulation model

Improving the quality of satellite altimetry data over continental shelves

Bottom pressure tides along a line in the southeast Atlantic Ocean and comparisons with satellite altimetry

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