6533b83afe1ef96bd12a7044
RESEARCH PRODUCT
Acoustic and optical variations during rapid downward motion episodes in the deep north-western Mediterranean Sea
H. Van HarenI. Taupier LetageJ. A. AguilarA. AlbertM. AnghinolfiG. AntonS. AnvarM. ArdidA. C. AssisjesusA. C. Assis JesusJesus AcaT. AstraatmadjaJ. J. AubertR. AuerB. BaretS. BasaM. BazzottiV. BertinS. BiagiC. BigongiariM. Bou CaboM. C. BouwhuisA. BrownJ. BrunnerJ. BustoF. CamarenaAntonio CaponeG. CarminatiJ. CarrD. CastelE. CastorinaV. CavasinniS. CecchiniPh CharvisT. ChiarusiM. CircellaR. ConiglioneH. CostantiniN. CottiniP. CoyleC. CurtilGiulia De BonisM. P. DecowskiI. DekeyserA. DeschampsC. DistefanoC. DonzaudD. DornicD. DrouhinT. EberlU. EmanueleJ. P. ErnenweinS. EscoffierF. FehrV. FlaminioK. FratiniU. FritschJ. L. FudaG. GiacomelliJ. P. Gomez GonzalezK. GrafG. GuillardG. HalladjianG. HallewellA. J. HeijboerY. HelloJ. J. Hernandez ReyJ. HosslM. DejongM. De JongN. Kalantar NayestanakiO. KalekinA. KappesU. KatzP. KooijmanC. KopperA. KouchnerW. KretschmerR. LahmannP. LamareG. LambardG. LarosaH. LaschinskyD. LefevreG. LelaizantG. LimD. LoprestiD. Lo PrestiH. LoehnerS. LoucatosFabrizio LucarelliK. LyonsS. ManganoM. MarcelinA. MargiottaJ. A. Martinez MoraG. MaurinA. MazureM. MelissasT. MontaruliM. MorgantiL. MoscosoH. MotzC. NaumannM. NeffR. OstaschG. PalioselitisG. E. PavalasP. PayreJ. PetrovicP. PiattelliN. Picot ClementeC. PicqR. PilletV. PopaT. PradierE. PresaniC. RaccaA. RaduC. ReedG. RiccobeneC. RichardtM. RujoiuG. V. RussoF. SalesaF. SchoeckJ. P. SchullerR. ShanidzeFrancesco SimeoneM. SpurioJ. J. M. SteijgerTh StolarczykC. TamburiniL. TascaS. ToscanoB. VallageV. VanelewyckV. Van ElewyckManuela VecchiP. VerninG. WijnkerE. DewolfE. De WolfH. YepesD. ZaborovJ. D. ZornozaJ. Zunigasubject
Optical telescopesDense water formation010504 meteorology & atmospheric sciencesDense watersBoundary currentWave reflectionOptical photo-multiplier observationsSuspended loadWATER FORMATIONOceanography01 natural scienceslaw.inventionPhysics - GeophysicsObservational methodMediterranean sea86-02lawDeep MediteraneanSeabedPhosphorescenceDeep seaCurrent (stream)VARIABILITYOptical methodOceanographyAcoustic variables measurementNorthern boundary currentantares neutrino telescope; deep mediteranean; northern boundary current; acoustic adcp observations; episodic downward current; dense water formation; bioluminescence; optical photo-multiplier observationsFísica nuclearAcoustic Doppler Current ProfilerBioluminescenceAstrophysics - Instrumentation and Methods for AstrophysicsANTARES neutrino telescopeGeology[PHYS.ASTR.IM]Physics [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM]Acoustic ADCP observationsCIRCULATIONFOS: Physical sciencesAquatic ScienceLIGURIAN SEAZooplanktonZooplanktonTelescopeAcoustic Doppler current profilerOCEANOPTICAL PHOTO-MULTIPLIERMediterranean Sea14. Life underwaterInstrumentation and Methods for Astrophysics (astro-ph.IM)0105 earth and related environmental sciencesLight reflectionANTARESAcoustic wave010505 oceanographyAdvectionDense waterElementary particlesZOOPLANKTON BIOMASSDoppler effectMARINE RESEARCHESGeophysics (physics.geo-ph)Boundary current[SDU.ASTR.IM]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM]Boundary currentsCONVECTION13. Climate actionFISICA APLICADAAdvectionEpisodic downward currentMediterranean Sea (Northwest)SYSTEMTelescopesdescription
An Acoustic Doppler Current Profiler (ADCP) was moored at the deep-sea site of the ANTARES neutrino telescope near Toulon, France, thus providing a unique opportunity to compare high-resolution acoustic and optical observations between 70 and 170 m above the sea bed at 2475 m. The ADCP measured downward vertical currents of magnitudes up to 0.03 m s-1 in late winter and early spring 2006. In the same period, observations were made of enhanced levels of acoustic reflection, interpreted as suspended particles including zooplankton, by a factor of about 10 and of horizontal currents reaching 0.35 m s-1. These observations coincided with high light levels detected by the telescope, interpreted as increased bioluminescence. During winter 2006 deep dense-water formation occurred in the Ligurian subbasin, thus providing a possible explanation for these observations. However, the 10-20 days quasi-periodic episodes of high levels of acoustic reflection, light and large vertical currents continuing into the summer are not direct evidence of this process. It is hypothesized that the main process allowing for suspended material to be moved vertically later in the year is local advection, linked with topographic boundary current instabilities along the rim of the 'Northern Current'.
year | journal | country | edition | language |
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2011-08-01 |