Ocean Swell Comparisons Between Sentinel‐1 and WAVEWATCH III Around Australia

Khan, Salman; Echevarria, E. R.; Hemer, Mark

doi:10.1029/2020jc016265

Cited by 16 publications

(7 citation statements)

References 45 publications

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“…Observations around the Southern Ocean indicate that very broad directional distributions are common in the region, with energy spreading across a range up to ±80 • around the mean wave direction (Young et al, 2020;Derkani et al, 2021). On occasions, this is the signature of chaotic sea states, where multiple (independent) wave systems, such as wind seas plus swells coexist (Aouf et al, 2020;Khan et al, 2021;Derkani et al, 2021;Alberello et al, 2022). Theory, numerical simulations and experiments have demonstrated that these multi-system seas accelerate development of nonlinear dynamics, further contributing to the occurrence of large amplitude waves (Onorato et al, 2006;Toffoli et al, 2011).…”

Section: Surface Wavesmentioning

confidence: 99%

Closing the loops on Southern Ocean dynamics: From the circumpolar current to ice shelves and from bottom mixing to surface waves

Bennetts,

Shakespeare,

Vreugdenhil

et al. 2024

Preprint

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A holistic review is given of the Southern Ocean dynamic system, in the context of the crucial role it plays in the global climate and the profound changes it is experiencing. The review focuses on connections between different components of the Southern Ocean dynamic system, drawing together contemporary perspectives from different research communities, with the objective of “closing loops” in our understanding of the complex network of feedbacks in the overall system. The review is targeted at researchers in Southern Ocean physical science with the ambition of broadening their knowledge beyond their specific field and facilitating better-informed interdisciplinary collaborations. For the purposes of this review, the Southern Ocean dynamic system is divided into four main components: large-scale circulation; cryosphere; turbulence; and gravity waves. Overviews are given of the key dynamical phenomena for each component, before describing the linkages between the components. The reviews are complemented by an overview of observed Southern Ocean trends and future climate projections. Priority research areas are identified to close remaining loops in our understanding of the Southern Ocean system.

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Section: Surface Wavesmentioning

confidence: 99%

Closing the loops on Southern Ocean dynamics: From the circumpolar current to ice shelves and from bottom mixing to surface waves

Bennetts,

Shakespeare,

Vreugdenhil

et al. 2024

Preprint

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“…Our results also compare well with those produced by studies comparing Sentinel-1 data with WW3. Kahn et al [61] reported mean significant wave height errors of 0.15-0.32 m (RMSE 0.64-0.76 m) and Wang et al [62] had mean wave height errors of 0.21-0.32 m (RMSE 0.5-0.64). The sources of error in significant wave height are likely to be the result of incorrectly classified surface points affecting the standard deviation of the elevation calculation.…”

Section: Basic Wave Metricsmentioning

confidence: 99%

“…Because of the broad spatial coverage provided by radar and imaging satellite sensors like Sentinel-1, directionality is more straightforward. Khan et al [61] were able to calculate wave direction with mean errors of ~3• (RMSE ~30 • ).…”

Section: Directionalitymentioning

confidence: 99%

Monitoring Coastal Waves with ICESat-2

Dietrich,

Magruder,

Holwill

2023

JMSE

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The coastal zone faces an ever-growing risk associated with climate-driven change, including sea level rise and increased frequency of extreme natural hazards. Often the location and dynamism of coastal regions makes them a formidable environment to adequately study with in-situ methods. In this study we use Ice, Cloud, and land Elevation Satellite-2 (ICESat-2) to make measurements of basic wave parameters and wave directionality in the coastal zones of the Hawaiian Islands and North Carolina, USA. Our goal was to leverage as much of the full resolution data available in the ATL03 data product to generate wave metrics out from shore up to ~25 km. Using a combination of statistical and signal processing methods, including cross-correlation and wavelets, we can use ICESat-2 to generate basic wave metrics, including significant wave heights with an accuracy of ±0.5 m. In some profiles we can identify wave shoaling, which could be useful to infer bathymetry and coastal dynamics. In areas with complex wave dynamics, the nature of how ICESat-2 measures elevations (parallel laser altimetry beams) can make extracting some wave parameters, especially wavelength and directionality, more challenging. These wave metrics can provide important data in support of validating wave and tidal models and may also prove useful in extended ICESat-2 applications like bathymetric corrections and satellite-derived bathymetry.

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“…In addition, the accuracy evaluation of Sentinel-1 wave mode data has also been implemented by some researchers. Khan [14] evaluated the wave height, average wave direction and average wave period of Sentinel-1A wave spectra from July 2015 to May 2020 and Sentinel-1B wave spectra from October 2016 to May 2020. The results show that the wave height and average wave period of Sentinel-1 are in good agreement with WW3 while the accuracy of wave direction is not good.…”

Section: Introductionmentioning

confidence: 99%

Accuracy Evaluation of Ocean Wave Spectra from Sentinel-1 SAR Based on Buoy Observations and ERA5 Data

Sun,

Yang,

Cui

2024

Remote Sensing

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Doppler mis-registrations in azimuth can lead to ocean waves shorter than a specific wavelength being undetectable by SAR. In order to evaluate the actual ocean wave observation ability, the accuracy of Sentinel-1 SAR ocean wave spectra from January 2016 to December 2021 is evaluated by comparisons to NDBC buoys, ERA5 wave height, and CMEMS buoys. The results compared with NDBC show that the spectral shape of Sentinel-1 SAR ocean wave spectra is accurate, while the spectral values need to be improved. The wave spectra of Sentinel-1 have the best observations in season autumn. The comparison results of total wave height show the RMSE and bias are 0.91 m and −0.52 m for the comparisons to NDBC buoy wave spectra data, 0.93 m and −0.68 m for the comparison to ERA5 wave height data, and 0.9 m and −0.35 m for the comparisons to CMEMS buoy data. The comparison results of wave height in different wind speeds and areas shows that the accuracy of Sentinel-1 wave mode data is relatively good in the open ocean located in middle and low latitude area under the medium wind speed, while those are relatively poor in high latitude areas or the areas with excessively high or low wind speed.

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Ocean Swell Comparisons Between Sentinel‐1 and WAVEWATCH III Around Australia

Cited by 16 publications

References 45 publications

Closing the loops on Southern Ocean dynamics: From the circumpolar current to ice shelves and from bottom mixing to surface waves

Closing the loops on Southern Ocean dynamics: From the circumpolar current to ice shelves and from bottom mixing to surface waves

Monitoring Coastal Waves with ICESat-2

Accuracy Evaluation of Ocean Wave Spectra from Sentinel-1 SAR Based on Buoy Observations and ERA5 Data

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