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REVIEW 3 major objections 1 minor 1 cited by

Predicting the Ocean Currents using Deep Learning

T0 review · 3 major / 1 minor · reviewed 2026-05-25 · grok-4.3

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Pith's one-line read LSTM networks can predict ocean current speeds in two horizontal directions from historical measurements.

desk verdict LSTM applied to one short buoy record with no error numbers, baselines, or out-of-sample tests, so the prediction claim stays unverified. read the letter →

arxiv 1906.08066 v1 pith:Y4H334IB submitted 2019-06-19 physics.ao-ph

Cihan Bayindir This is my paper · ORCID
classification physics.ao-ph
keywords oceancurrentsLSTMdeeplearningcurrentpredictionMassachusettsBayuandvvelocitiesspectralproperties
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

The paper trains a Long Short Term Memory network on NOAA data collected in Massachusetts Bay from late 2002 to early 2003. It demonstrates that the model can forecast the east-west and north-south current components, called u and v. The work shows how the size and resolution of the training set change both the size of the forecast errors and the frequency content of the predicted time series. If these forecasts hold, they could support calculations of tidal energy output and estimates of forces on underwater structures. The results also indicate that higher-resolution data can extend the useful prediction horizon in both time and space.

What carries the argument

The Long Short Term Memory (LSTM) network that processes sequences of ocean current measurements to output future values of u and v.

What would settle it

Running the trained LSTM on current measurements from a later year or a different bay and finding that the predicted u and v series deviate substantially from the recorded speeds or lose the correct frequency peaks.

Watch

Extended reading notes

Core claim

An LSTM network applied to the 2002-2003 Massachusetts Bay current records produces forecasts of the two horizontal velocity components u and v whose accuracy and spectral character depend on the temporal and spatial resolution of the training data.

Load-bearing premise

The accuracy achieved on the single 2002-2003 Massachusetts Bay training period will continue when the same model is applied to other periods or other coastal sites.

Editorial extensions

If this is right

  • Forecast skill for u and v improves or degrades directly with the temporal or spatial density of the training records.
  • The frequency spectrum of the LSTM output can be made to match the measured spectrum more closely by selecting appropriate training intervals.
  • Prediction horizons in time and distance become longer when the data resolution is increased.
  • The same trained model supplies inputs for tidal-energy estimates and for calculations of current-induced forces on marine structures.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • The method could be tested on real-time buoy streams to see whether forecasts remain stable when new measurements arrive continuously.
  • Pairing the LSTM output with a simple physical circulation model might reduce drift over multi-day horizons.
  • If the spectral fidelity holds across sites, the approach could help locate regions where chaotic currents block surface waves.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit.

Referee Report

3 major / 1 minor

Summary. The manuscript applies Long Short-Term Memory (LSTM) networks to predict the u and v components of ocean currents from NOAA buoy measurements collected in Massachusetts Bay between November 2002 and February 2003. It examines how training dataset size and temporal/spatial resolution affect prediction error and the spectral properties of the forecasts, and suggests applications including tidal energy variation, marine structure vibrations, and wave blocking estimation.

Significance. If the reported LSTM forecasts were shown to outperform standard baselines on temporally or spatially disjoint test data while preserving spectral content, the work would establish a viable data-driven method for short-term ocean current prediction. The focus on resolution-dependent prediction horizons and spectral fidelity would then provide concrete guidance on data requirements for operational forecasting in ocean engineering and renewable energy contexts.

major comments (3)
  1. [Abstract] Abstract: The central claim that 'the current speed in two horizontal directions, namely u and v, can be predicted using the LSTM' is presented without any quantitative error statistics (RMSE, correlation, etc.), baseline comparisons, or description of the train-test split, rendering the result an unverified assertion rather than a demonstrated finding.
  2. [Experiments/Results] Experiments/Results sections: All reported predictions and spectral comparisons are generated from the single 2002-2003 Massachusetts Bay dataset with no held-out seasons, locations, or cross-validation; without persistence, AR(1), or linear-regression baselines, any apparent accuracy cannot be attributed to learned dynamics rather than short-term autocorrelation already present in the buoy time series.
  3. [Methods] Methods: No model hyperparameters, regularization strategy, optimizer settings, or loss function are specified, and no numerical values for prediction error as a function of training-set size or resolution are tabulated, preventing assessment or reproduction of the claimed dependence of prediction times/distances on data resolution.
minor comments (1)
  1. [Abstract] The terms 'prediction times and distances' are used in the abstract without explicit definition or units, and the manuscript does not clarify whether these refer to forecast lead time, spatial extrapolation distance, or both.

Simulated Author's Rebuttal

3 responses · 1 unresolved

We thank the referee for the constructive comments on our manuscript. We address each major comment below and indicate the revisions planned.

read point-by-point responses

  1. Referee: [Abstract] Abstract: The central claim that 'the current speed in two horizontal directions, namely u and v, can be predicted using the LSTM' is presented without any quantitative error statistics (RMSE, correlation, etc.), baseline comparisons, or description of the train-test split, rendering the result an unverified assertion rather than a demonstrated finding.

    Authors: We agree that the abstract should include quantitative support for the central claim. In the revised manuscript we will update the abstract to report key error statistics (RMSE and correlation for u and v) and briefly note the temporal train-test split employed in the study. revision: yes

  2. Referee: [Experiments/Results] Experiments/Results sections: All reported predictions and spectral comparisons are generated from the single 2002-2003 Massachusetts Bay dataset with no held-out seasons, locations, or cross-validation; without persistence, AR(1), or linear-regression baselines, any apparent accuracy cannot be attributed to learned dynamics rather than short-term autocorrelation already present in the buoy time series.

    Authors: The manuscript is an exploratory study of how training-set size and resolution affect error and spectral fidelity on this specific dataset. We will add persistence and AR(1) baseline comparisons in the revised results to help attribute performance beyond autocorrelation. The original analysis used a temporal split within the available record; we will clarify this and add time-series cross-validation where feasible. However, the study contains only one buoy record from a single season and location. revision: partial

  3. Referee: [Methods] Methods: No model hyperparameters, regularization strategy, optimizer settings, or loss function are specified, and no numerical values for prediction error as a function of training-set size or resolution are tabulated, preventing assessment or reproduction of the claimed dependence of prediction times/distances on data resolution.

    Authors: We will expand the Methods section to specify the LSTM architecture (layers, hidden units), all hyperparameters, regularization, optimizer, and loss function. We will also add a table reporting numerical prediction errors as a function of training-set size and resolution to support reproducibility and the claimed dependence. revision: yes

standing simulated objections not resolved
  • The study is restricted to a single NOAA buoy record from one location and four-month period; results on temporally or spatially disjoint test data from other seasons or locations cannot be provided without new measurements.

Circularity Check

0 steps flagged · score 0.0 of 10

No circularity: LSTM predictions are generated by trained network on data, not algebraically equivalent to inputs.

full rationale

The paper applies a standard LSTM architecture to time-series buoy data from a single NOAA deployment. The claimed predictions of u and v components are produced by forward passes of the trained network on held-out segments of that data; they are not obtained by algebraic rearrangement of the training inputs, by re-using fitted parameters as the output, or by any self-referential definition. No uniqueness theorem, ansatz, or prior self-citation is invoked to force the result. The central claim therefore remains an empirical statement about model performance rather than a tautology. Minor self-citations, if present, are not load-bearing for the prediction step itself.

Assumptions & free parameters 1 free parameters · 1 assumptions · 0 invented entities

The work rests on standard neural-network assumptions and the representativeness of a single four-month buoy record; no new physical entities are postulated.

free parameters (1)
  • LSTM architecture hyperparameters
    Number of layers, hidden units, learning rate, and sequence length are chosen to fit the training data.
assumptions (1)
  • domain assumption The measured current time series contains learnable temporal patterns that an LSTM can exploit for multi-step forecasting.
    Invoked when the authors state that u and v can be predicted from the data.

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Cite this review

Pith. "Pith review of Predicting the Ocean Currents using Deep Learning." pith.science (2026). https://pith.science/paper/Y4H334IB

@misc{pith2026190608066,
  author       = {Pith},
  title        = {Pith review of: Predicting the Ocean Currents using Deep Learning},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/Y4H334IB}},
  note         = {Machine review of arXiv:1906.08066}
}
read the original abstract

In this paper, we analyze the predictability of the ocean currents using deep learning. More specifically, we apply the Long Short Term Memory (LSTM) deep learning network to a data set collected by the National Oceanic and Atmospheric Administration (NOAA) in Massachusetts Bay between November 2002-February 2003. We show that the current speed in two horizontal directions, namely u and v, can be predicted using the LSTM. We discuss the effect of training data set on the prediction error and on the spectral properties of predictions. Depending on the temporal or the spatial resolution of the data, the prediction times and distances can vary, and in some cases, they can be very beneficial for the prediction of the ocean current parameters. Our results can find many important applications including but are not limited to predicting the tidal energy variation, controlling the current induced vibrations of marine structures and estimation of the wave blocking point by the chaotic oceanic current and circulation.

Figures

Figures reproduced from arXiv: 1906.08066 by the authors.

Figure 1
Figure 1. FIG. 1: LSTM layer architecture [33] [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. FIG. 2: LSTM gates [33] [PITH_FULL_IMAGE:figures/full_fig_p002_2.png] view at source ↗
Figure 3
Figure 3. FIG. 3: LSTM components and formula [33]. [PITH_FULL_IMAGE:figures/full_fig_p003_3.png] view at source ↗
Figures from the paper (17 more)
Figure 5
Figure 5. Figure 5: We compare the predicted and observed time series and depict the root-mean-square (rms) error in Fig. 6. As [PITH_FULL_IMAGE:figures/full_fig_p003_5.png]
Figure 4
Figure 4. Figure 4: FIG. 4: Ocean current speed time series a) u (m/s) b) v (m/s). [PITH_FULL_IMAGE:figures/full_fig_p004_4.png]
Figure 5
Figure 5. Figure 5: FIG. 5: Observed and predicted time series of the first component of the current velocity (u) obtained using the initial 95 % [PITH_FULL_IMAGE:figures/full_fig_p004_5.png]
Figure 6
Figure 6. Figure 6: FIG. 6: a) Comparisons between the observed and predicted time series of the first component of the current velocity (u) [PITH_FULL_IMAGE:figures/full_fig_p004_6.png]
Figure 7
Figure 7. Figure 7: FIG. 7: Observed and predicted time series of the first component of the current velocity (u) obtained using the initial 95 % [PITH_FULL_IMAGE:figures/full_fig_p005_7.png]
Figure 8
Figure 8. Figure 8: FIG. 8: a) Comparisons between the observed and predicted time series of the first component of the current velocity (u) [PITH_FULL_IMAGE:figures/full_fig_p005_8.png]
Figure 9
Figure 9. Figure 9: FIG. 9: Observed and predicted time series of the second component of the current velocity (v) obtained using the initial 95 [PITH_FULL_IMAGE:figures/full_fig_p006_9.png]
Figure 10
Figure 10. Figure 10: FIG. 10: a) Comparisons between the observed and predicted time series of the second component of the current velocity (v) [PITH_FULL_IMAGE:figures/full_fig_p006_10.png]
Figure 11
Figure 11. Figure 11: FIG. 11: Observed and predicted time series of the second component of the current velocity (v) obtained using the initial 95 [PITH_FULL_IMAGE:figures/full_fig_p006_11.png]
Figure 12
Figure 12. Figure 12: FIG. 12: a) Comparisons between the observed and predicted time series of the second component of the current velocity (v) [PITH_FULL_IMAGE:figures/full_fig_p007_12.png]
Figure 13
Figure 13. Figure 13: FIG. 13: a) Comparisons between the observed and predicted time series of the first component of the current velocity (u) [PITH_FULL_IMAGE:figures/full_fig_p007_13.png]
Figure 14
Figure 14. Figure 14: FIG. 14: Comparison of the Fourier spectra of the observed and predicted time series of the first component of the current [PITH_FULL_IMAGE:figures/full_fig_p007_14.png]
Figure 15
Figure 15. Figure 15: FIG. 15: a) Comparisons between the observed and predicted time series of the first component of the current velocity (u) [PITH_FULL_IMAGE:figures/full_fig_p008_15.png]
Figure 16
Figure 16. Figure 16: FIG. 16: Comparison of the Fourier spectra of the observed and predicted time series of the first component of the current [PITH_FULL_IMAGE:figures/full_fig_p008_16.png]
Figure 17
Figure 17. Figure 17: FIG. 17: a) Comparisons between the observed and predicted time series of the second component of the current velocity (v) [PITH_FULL_IMAGE:figures/full_fig_p009_17.png]
Figure 18
Figure 18. Figure 18: FIG. 18: a) Comparisons between the observed and predicted time series of the second component of the current velocity (v) [PITH_FULL_IMAGE:figures/full_fig_p009_18.png]
Figure 19
Figure 19. Figure 19: FIG. 19: Comparison of the Fourier spectra of the observed and predicted time series of the second component of the current [PITH_FULL_IMAGE:figures/full_fig_p009_19.png]

Discussion (0). Continue with ORCID to comment.

Forward citations

Cited by 1 Pith paper

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