Movie:WAVEWATCH III model run Mar 2008 to May 2008
Information Page: WAVEWATCH III model run Mar 2008 to May 2008
Wavewatch III^TM wave height simulation
|Model name:||WAVEWATCH III|
Grade level: Middle (6-8), High (9-12), Under graduate (13-16)
Statement: Global Swell Visualization
Abstract: WAVEWATCH III^TM is a 2D model that evolves various atmospheric and oceanic factors creating and propagating multi spectrum wind waves through a given region. Wind waves are evolved based on the influence of surface wind, currents, water level changes, ice concentrations, air-sea surface temperature gradients and wave interactions with the sea bottom.
WAVEWATCH III^TM has been shown to be a highly accurate global wave model and has been validated globally using data from buoys and ERSI altimeter data. The error range is typically within 15% of the local mean observed height based on the altimeter and buoy data. WAVEWATCH III^TM has been shown to be particularly accurate in the tropics and in the forecast of extreme wave heights. It has been shown to have slightly poorer accuracy in selected high-latitude regions.
This animation was generated by the model WAVEWATCH III^TM and spans three calendar months. The model evolves the generation of wind waves due to the effects of surface winds. As the wind waves move out from the influence of the storm they propagate through the ocean as swell, or gravity driven waves. The model also evolves the effects of bottom interactions (including shoaling and refraction) as well as currents, water level changes and ice concentrations.
The color scale of the movies represents wave height as generated by wind activity. Areas that have high wind concentrations (storms) can be seen as they generate large swell that then propagate across oceans (shown in warmer colors). It is possible to follow the swell generated by a given storm as it propagates across the ocean and the interaction that it has with various obstructions such as islands and continents. Seasonal differences are also readily apparent in the varying size and location of the major swell generating storm events. As the seasons change, the areas where the major swell generating storms are generated change, moving north and south, following the local winter. This is represented in these movies by areas of large swell. It is also possible to see more local events such as tropical and extratropical cyclones and the effects that major currents such as the Gulf Stream have on their trajectory.
Highlighted below are some notable storm events distinguishable by their swell patters.
The swell generated from the largest tropical cyclone to strike China since 1949, typhoon Neoguri, can be seen on April 18th.
On May 3rd the increase in swell due to Cyclone Nargis is visible as it makes landfall in Yangon, Myanmar.
WAVEWATCH III^TM is the third generation of wave models designed by NOAA and has significant improvements from previous generations of this model and other similar models. As stated by NOAA and the developers of WAVEWATCH IIITM; “WAVEWATCH III^TM solves the random phase spectral action density balance equation for wavenumber-direction spectra.” (NOAA website) This allows the model to evolve and follow swell patterns as they are generated and travel throughout the world’s oceans based on the conservative nature of energy in gravity driven ocean swell. Additionally, in the most recent version of WAVEWATCH III^TM there are options allowing for shallow water (surf zone) physics. At this stage they are fairly crude but usable.
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