Abstract
The wind stress is a measure of the intensity of air-sea momentum transfer and functions as a sea surface drag to resist the atmospheric flow. The wind stress generates the sea state but also depends on the sea state. Under the action of a tropical cyclone (TC), however, the sea state is extremely severe and highly uncertain, particularly under shallow water conditions. It can hardly be regarded as a direct consequence of the wind speed only. This study investigates the spatial variation of the wind stress under the action of a TC moving from deep to shallow waters by coupling the well-known WaveWatch III (WWIII) model with the extended atmospheric wave boundary layer model (eAWBLM), which has been well developed in recent years. An idealized TC is first introduced as the forcing wind to pursue the objective of the study. The sea state that affects the wind stress is shown to include the total wind wave energy, the high-frequency wave energy dissipation due to fluid viscosity, the energy dissipation due to wave breaking, the wave age, the mean wave steepness, and the misalignment of wind and wave directions. It is demonstrated that the wind stress reaches relatively large values in the front-left quadrant of the TC covered region in both deep and shallow waters. The time delay of the ocean surface responding to wind forcing results in younger and steeper waves in the left and rear quadrants of the TC, which leads to relatively large values of the surface drag coefficient. The surface drag coefficient decreases if the wind and the dominant wave directions are misaligned. The numerical model is also applied to the study of Hurricane Ivan (2004) generated ocean waves and satisfactory results are obtained owing to a more accurate evaluation of the wind stress by considering its dependence on the sea state.
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Data availability
The data that support the findings of this study are available from public sources. The H*wind data is available at https://www.rms.com/event-response/hwind; the ECMWF wind data is available at https://www.ecmwf.int/; the topography data is available at https://www.ngdc.noaa.gov/mgg/global/global.html; the buoy data is available at https://www.ndbc.noaa.gov/.
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Acknowledgements
This research is supported by National Natural Science Foundation of China (NSFC) under grant No. 41976196.