A global wave parameter database for geophysical applications. Part 3: Improved forcing and spectral resolution

Alday, Matias; Accensi, Mickaël; Ardhuin, Fabrice; Dodet, Guillaume

doi:10.1016/j.ocemod.2021.101848

Cited by 47 publications

(51 citation statements)

References 92 publications

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“…Our implementation of WW3 uses a global integration time step of 600 s, spatial advection time step of 60 s, spectral advection time step of 60 s, and minimum source term time step of 10 s. The recently proposed T475 parameterization is used with the wind input source term S in in the present simulations (Alday et al, 2021). This aims to mitigate the error in the wave model when the wind speed is larger than 20 m s −1 in ERA5.…”

Section: Experimental Designmentioning

confidence: 99%

Focusing and Defocusing of Tropical Cyclone Generated Waves by Ocean Current Refraction

et al. 2022

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Waves generated by tropical cyclones can have devastating effects on coastal regions. However, the role of ocean currents in modifying wave amplitudes, wavelengths, and directions is commonly overlooked in wave forecasts, despite the fact that these interactions can lead to extreme wave conditions. Here, we use satellite observations and wave modeling to quantify the effects of ocean currents on the surface waves generated during a tropical cyclone event in the Arabian Sea. As a case study, this paper documents beams of wave heights originating from the eyewall of a tropical cyclone caused by current‐induced refraction. Alternating regions of high and low wave heights in the model simulations are consistent with observations and extend for thousands of kilometers all the way to 100 m isobath. Our results highlight the importance of accounting for wave refraction by currents in order to accurately predict the impact of tropical cyclone generated waves on coastal regions.

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Section: Experimental Designmentioning

confidence: 99%

Focusing and Defocusing of Tropical Cyclone Generated Waves by Ocean Current Refraction

et al. 2022

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“…(2010) with adjustments described in Alday et al (2021) consistent with the global model used for our boundary conditions. A constant wave energy reflection of 5% is used at the coastlines, as parameterized by .…”

Section: Source Terms and Numerical Choicesmentioning

confidence: 99%

“…Tolman, 1995b;Roland and Ardhuin, 2014). For example, in the hindcast presented in Alday et al (2021), more accurate wave height distributions were obtained at global scale by adjusting parameterizations and discretizations. When it comes to nested models, the characteristics of the boundary conditions should also be taken into account.…”

Section: Introductionmentioning

confidence: 99%

“…In the present paper the analysis is extended to intermediate and shallow water depths. To this end, we present a high resolution wave hindcast for European Atlantic waters, using boundary conditions from Alday et al (2021). Through out the study we attempt to determine which elements in the model setup have a significant effect on the characteristics of the simulated sea states and hence the accuracy of the results.…”

Section: Introductionmentioning

confidence: 99%

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Accuracy of numerical wave model results: Application to the Atlantic coasts of Europe

Alday

Ardhuin

Dodet

et al. 2022

Preprint

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Abstract. Numerical wave models are generally less accurate in the coastal ocean than offshore. It is generally suspected that a number of factors specific to coastal environments can be blamed for these larger model errors: complex shoreline and topography, relatively short fetches, combination of remote swells and local wind seas, less accurate wind fields, presence of strong currents, bottom friction, etc. These factors generally have strong local variations, making it all the more difficult to adapt a particular model setup from one area to another. Here we investigate a wide range of modelling choices including forcing fields, spectral resolution and parameterizations of physical processes in a regional model that covers most of the Atlantic and North Sea coasts. We show that the accurate propagation of waves from offshore is probably the most important factor on exposed shorelines, while other specific effects can be important locally, including winds, currents and bottom friction.

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“…SAR ocean wave acquisitions have proven to benefit the numerical wave model community to propose new modeling developments [17,21] or for assimilation in operational systems, e.g., [22]. In this context, the detailed statistical knowledge of quality assessments on the Sentinel-1A/B (S-1A/B) SAR swell height products (both Level-2 OCN and CMEMS Level-3 "fireworks") are of vital importance for these research and applications.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Ocean Swell Height Observations from Sentinel-1A/B Wave Mode against Buoy In Situ and Modeling Hindcasts

et al. 2022

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Synthetic Aperture Radar (SAR) in wave mode is a powerful tool for monitoring sea states in terms of long-period ocean swells of a specific wave directional partition. Since 2016, SARs aboard Sentinel-1A/B operating in wave mode have provided ocean swell spectra dataset as Level-2 Ocean products on a continuous and global basis over open oceans. Furthermore, Level-3 swell products are processed by Copernicus Marine Environment Monitoring Services (CMEMS) taking the benefit of the unique “fireworks” analysis. In this paper, swell wave heights from Sentinel-1A/B wave mode during the period from June 2016 to June 2020 are evaluated. The reference data include the collocated in situ measurements from directional wave buoys and WaveWatch III (WW3) hindcasts. Assessment results show systematic overestimation of approximately 0.2 m in terms of the partitioned swell heights for Sentinel-1A/B Level-2 products compared to the directional buoy observations in eastern Pacific and the western Atlantic. Based on the reliable SAR-WW3 collocations after quality-controls, empirical corrections have been proposed for Sentinel-1 Level-2 swell heights. Independent comparisons against WW3 hindcasts and buoy observations demonstrate the validity of our postprocessing correction for both Level-2 and Level-3 swell heights by eliminating the biases and reducing the root mean square errors. The consistency between CMEMS Level-3 swells and buoy in situ is also examined and discussed by case studies.

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A global wave parameter database for geophysical applications. Part 3: Improved forcing and spectral resolution

Cited by 47 publications

References 92 publications

Focusing and Defocusing of Tropical Cyclone Generated Waves by Ocean Current Refraction

Focusing and Defocusing of Tropical Cyclone Generated Waves by Ocean Current Refraction

Accuracy of numerical wave model results: Application to the Atlantic coasts of Europe

Assessment of Ocean Swell Height Observations from Sentinel-1A/B Wave Mode against Buoy In Situ and Modeling Hindcasts

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