Spectral structure of mesoscale winds over the water

Publication: Research - peer-reviewJournal article – Annual report year: 2012

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Standard meteorological measurements from a number ofmasts around two Danish offshore wind farms have been used to study the spectral structure of the mesoscale winds, including the power spectrum, the co- and quadrature spectrum and the coherence. When average conditions are considered, the power spectra show universal characteristics, in agreement with the findings in literature, including the energy amplitude and the −5/3 spectral slope in the mesoscale range transitioning to a slope of −3 for synoptic and planetary scales. The integral time-scale of the local weather is found to be useful to describe the spectral slope transition as well as the limit for application of the Taylor hypothesis. The stability parameter calculated from point measurements, the bulk Richardson number, is found insufficient to represent the various atmospheric structures that have their own spectral behaviours under different stability conditions, such as open cells and gravity waves. For stationary conditions, the mesoscale turbulence is found to bear some characteristics of two-dimensional isotropy, including (1) very minor vertical variation of spectra; (2) similar spectral behaviour for the along- and across-wind components; and (3) the along- and across-wind components at one point are not correlated. Copyright © 2012 RoyalMeteorological Society
Original languageEnglish
JournalRoyal Meteorological Society. Quarterly Journal
Publication date2013
Volume139
Issue672
Pages685-700
ISSN0035-9009
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 2

Keywords

  • Power spectrum, Cospectrum, Quadrature spectrum, Coherence, Taylor hypothesis
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