{"refrec":{"BRefID":300159,"RR":"<b>van Haren, H.</b> (2018). Abyssal plain hills and internal wave turbulence. <i>Biogeosciences 15(14)</i>: 4387-4403. <a href=\"https://doi.org/10.5194/bg-15-4387-2018\" target=\"_blank\">https://doi.org/10.5194/bg-15-4387-2018</a>","BEntID":292380,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Biogeosciences 15(14)</i>: 4387-4403. <a href=\"https://doi.org/10.5194/bg-15-4387-2018\" target=\"_blank\">https://doi.org/10.5194/bg-15-4387-2018</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"van Haren, H.","OrigTitleTranslFlag":0,"Authorstringtrunc":"van Haren, H.","Englishabstract":"400m long array with 201 high-resolution NIOZ temperature sensors was deployed above a north-east equatorial Pacific hilly abyssal plain for 2.5 months. The sensors sampled at a rate of 1Hz. The lowest sensor was at 7m above the bottom (ma.b.). The aim was to study internal waves and turbulent overturning away from large-scale ocean topography. Topography consisted of moderately elevated hills (a few hundred metres), providing a mean bottom slope of one-third of that found at the Mid-Atlantic Ridge (on 2km horizontal scales). In contrast with observations over large-scale topography like guyots, ridges and continental slopes, the present data showed a well-defined near-homogeneous bottom boundary layer. However, its thickness varied strongly with time between  < 7 and 100ma.b. with a mean around 65ma.b. The average thickness exceeded tidal current bottom-frictional heights so that internal wave breaking dominated over bottom friction. Near-bottom fronts also varied in time (and thus space). Occasional coupling was observed between the interior internal wave breaking and the near-bottom overturning, with varying up- and down- phase propagation. In contrast with currents that were dominated by the semidiurnal tide, 200m shear was dominant at (sub-)inertial frequencies. The shear was so large that it provided a background of marginal stability for the straining high-frequency internal wave field in the interior. Daily averaged turbulence dissipation rate estimates were between 10<sup>−10</sup> and 10<sup>−9</sup>m<sup>2</sup>s<sup>−3</sup>, increasing with depth, while eddy diffusivities were of the order of 10<sup>−4</sup>m<sup>2</sup>s<sup>−1</sup>. This most intense near-bottom internal-wave-induced turbulence will affect the resuspension of sediments.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Abyssal plain hills and internal wave turbulence","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2024-12-10 01:33:01.897972","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":2018,"MonPub":null,"DateUpdate":"2018-08-22","DateCreate":"2018-08-09","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000439170800001","VABBcode":null,"OpenAcc":1,"DOI":"10.5194/bg-15-4387-2018"},"refs":null,"anarec":{"AnaID":300159,"PubliDate":2018,"Pagination":"4387-4403","XtraPublOfAnaID":null,"ISBN":null,"Volume":"15","Issue":"14","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":68092,"SerRR":"<b>Gattuso, J.P.; Kesselmeier, J. (Ed.)</b> Biogeosciences. Copernicus Publications: Göttingen.  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