{"refrec":{"BRefID":58364,"RR":"<b>van Haren, H.</b> (2004). Current spectra under varying stratification conditions in the central North Sea. <i>J. Sea Res. 51(2)</i>: 77-91. <a href=\"http://dx.doi.org/10.1016/j.seares.2003.06.003\" target=\"_blank\">http://dx.doi.org/10.1016/j.seares.2003.06.003</a>","BEntID":55964,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>J. Sea Res. 51(2)</i>: 77-91. <a href=\"https://dx.doi.org/10.1016/j.seares.2003.06.003\" target=\"_blank\">https://dx.doi.org/10.1016/j.seares.2003.06.003</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"van Haren, H.","OrigTitleTranslFlag":0,"Authorstringtrunc":"van Haren, H.","Englishabstract":"Given strongly different vertical stratification and not significantly different kinetic energy, `internal wave' band spectral properties were studied using two 8-day representative sets of observations from the central North Sea in winter and summer. The observed similar spectral shape of the internal wave band was due to a combination of deterministic narrow band and intermittent signals. In addition to dominant tidal harmonics, 25% of total kinetic energy was found at inertial and non-linear inertial-tidal interaction frequencies in summer and about the same amount was found in broad-band response to atmospheric forcing in winter. The energy at the (seasonal) non-linear interaction frequencies was proportional to stratification, specifically, to near-inertial shear magnitude. In summer, motions at frequencies (σ) between f<σ< 2.5 cpd (cycles per day) appeared in low vertical mode, whilst the power P(σ) of motions at σ> 4 ±1 cpd obeyed canonical internal wave scaling P(σ) ~ C<sup>-2</sup>, provided the shear magnitude [S] was used instead of the buoyancy frequency N for the factor C. Motions at 2.5 <σ< 4 ± 1 cpd appeared as transition between the two regimes. In winter no inertial motions were observed.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Current spectra under varying stratification conditions in the central North Sea","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2025-07-02 08:33:14.980000","timezone_type":1,"timezone":"+00:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"spectra; seasonal stratification; central North Sea","OtherDescriptors":null,"Notes":null,"AnaPub":2004,"MonPub":null,"DateUpdate":"2018-05-17","DateCreate":"2004-03-11","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000220026900001","VABBcode":null,"OpenAcc":1,"DOI":"10.1016/j.seares.2003.06.003"},"refs":null,"anarec":{"AnaID":58364,"PubliDate":2004,"Pagination":"77-91","XtraPublOfAnaID":null,"ISBN":null,"Volume":"51","Issue":"2","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43261,"SerRR":"Journal of Sea Research. 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