Case study of duration-limited wave spectra observed at an open ocean tower
| Autor: | L. S. Simpson, P. S. DeLeonibus |
|---|---|
| Rok vydání: | 1972 |
| Předmět: |
Physics
Atmospheric Science Ecology Fetch Momentum transfer Paleontology Soil Science Breaking wave Forestry Geophysics Aquatic Science Oceanography Swell Spectral line Computational physics Space and Planetary Science Geochemistry and Petrology Wave shoaling Earth and Planetary Sciences (miscellaneous) Atmospheric instability Shear velocity Physics::Atmospheric and Oceanic Physics Earth-Surface Processes Water Science and Technology |
| Zdroj: | Journal of Geophysical Research. 77:4555-4569 |
| ISSN: | 0148-0227 |
| DOI: | 10.1029/jc077i024p04555 |
| Popis: | A sequence of double-peaked open-ocean wave spectra was observed simultaneously with eddy correlation estimates of momentum flux and atmospheric stability over a 15-hour interval at Argus Island tower (near Bermuda) on March 22 and 23, 1967. The wave spectra were associated with a generating sea and advecting swell in the fetch of the warm sector of an advancing cyclone. The equilibrium range constant for these wave spectra was estimated at (7.8 ± 1.6) × 10−3. The Miles-Phillips exponential growth parameter was in reasonably good agreement with other field investigations, and observations support predicted amplification factors given by Phillips (1966) over the range 20 ≤ C/U* ≤ 32 where C is wave phase speed and U* is the friction velocity. Two observations of both linear and exponential growth parameters associated with spectral frequencies of 0.13 and 0.14 Hz were available to compare predicted and observed wave growth, with good results after correction for residual wave background. Observed temporal overshoot-undershoot of a particular wave component is interpreted in terms of an energy balance between wind input, wave-wave interactions, and wave breaking as a wave component evolves to its equilibrium condition. An example of spectral growth associated with advecting lower-frequency swell illustrates wave-induced fluctuations associated with momentum transfer from the sea to the atmosphere. Peaks in the horizontal and vertical wind-velocity spectra and the cospectra and quadrature spectra associated with wave spectral peaks are clearly evident when ocean swell propagates through the observation area. |
| Databáze: | OpenAIRE |
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