Acoustic and optical variations during rapid downward motion episodes in the deep north-western Mediterranean Sea

H. Van Haren, I. Taupier-Letage, J. A. Aguilar, A. Albert, M. Anghinolfi, G. Anton, S. Anvar, M. Ardid, A. C. Assis Jesus, T. Astraatmadja, J. J. Aubert, R. Auer, B. Baret, S. Basa, M. Bazzotti, V. Bertin, S. Biagi, C. Bigongiari, M. Bou-Cabo, M. C. BouwhuisA. Brown, J. Brunner, J. Busto, F. Camarena, A. Capone, G. Carminati, J. Carr, D. Castel, E. Castorina, V. Cavasinni, S. Cecchini, P. Charvis, T. Chiarusi, M. Circella, R. Coniglione, H. Costantini, N. Cottini, P. Coyle, C. Curtil, G. De Bonis, M. P. Decowski, I. Dekeyser, A. Deschamps, C. Distefano, C. Donzaud, D. Dornic, D. Drouhin, T. Eberl, U. Emanuele, J. P. Ernenwein, S. Escoffier, F. Fehr, V. Flaminio, K. Fratini, U. Fritsch, J. L. Fuda, G. Giacomelli, J. P. Gómez-González, K. Graf, G. Guillard, G. Halladjian, G. Hallewell, A. J. Heijboer, Y. Hello, J. J. Hernández-Rey, J. Hößl, M. de Jong, N. Kalantar-Nayestanaki, O. Kalekin, A. Kappes, U. Katz, P. Kooijman, C. Kopper, A. Kouchner, W. Kretschmer, R. Lahmann, P. Lamare, G. Lambard, G. Larosa, H. Laschinsky, D. Lefèvre, G. Lelaizant, G. Lim, D. Lo Presti, H. Loehner, S. Loucatos, F. Lucarelli, K. Lyons, S. Mangano, M. Marcelin, A. Margiotta, J. A. Martinez-Mora, G. Maurin, A. Mazure, M. Melissas, T. Montaruli, M. Morganti, L. Moscoso, Holger Martin Motz, C. Naumann, M. Neff, R. Ostasch, G. Palioselitis, G. E. Pâvâlaş, P. Payre, J. Petrovic, P. Piattelli, N. Picot-Clemente, C. Picq, R. Pillet, V. Popa, T. Pradier, E. Presani, C. Racca, A. Radu, C. Reed, G. Riccobene, C. Richardt, M. Rujoiu, G. V. Russo, F. Salesa, F. Schoeck, J. P. Schuller, R. Shanidze, F. Simeone, M. Spurio, J. J M Steijger, T. Stolarczyk, C. Tamburini, L. Tasca, S. Toscano, B. Vallage, V. Van Elewyck, M. Vecchi, P. Vernin, G. Wijnker, E. de Wolf, H. Yepes, D. Zaborov, J. D. Zornoza, J. Zúñiga

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

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 170m above the sea bed at 2475m. The ADCP measured downward vertical currents of magnitudes up to 0.03ms-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 0.35ms-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'.

Original languageEnglish
Pages (from-to)875-884
Number of pages10
JournalDeep-Sea Research Part I: Oceanographic Research Papers
Volume58
Issue number8
DOIs
Publication statusPublished - 2011 Aug
Externally publishedYes

Fingerprint

Mediterranean Sea
acoustics
Acoustic Doppler Current Profiler
boundary current
bioluminescence
dense water
winter
deep sea
zooplankton
advection
seafloor
deep water
summer
France
water
telescopes
particle
material

Keywords

  • Acoustic ADCP observations
  • ANTARES neutrino telescope
  • Bioluminescence
  • Deep Mediteranean
  • Dense water formation
  • Episodic downward current
  • Northern boundary current
  • Optical photo-multiplier observations

ASJC Scopus subject areas

  • Aquatic Science
  • Oceanography

Cite this

Acoustic and optical variations during rapid downward motion episodes in the deep north-western Mediterranean Sea. / Van Haren, H.; Taupier-Letage, I.; Aguilar, J. A.; Albert, A.; Anghinolfi, M.; Anton, G.; Anvar, S.; Ardid, M.; Assis Jesus, A. C.; Astraatmadja, T.; Aubert, J. J.; Auer, R.; Baret, B.; Basa, S.; Bazzotti, M.; Bertin, V.; Biagi, S.; Bigongiari, C.; Bou-Cabo, M.; Bouwhuis, M. C.; Brown, A.; Brunner, J.; Busto, J.; Camarena, F.; Capone, A.; Carminati, G.; Carr, J.; Castel, D.; Castorina, E.; Cavasinni, V.; Cecchini, S.; Charvis, P.; Chiarusi, T.; Circella, M.; Coniglione, R.; Costantini, H.; Cottini, N.; Coyle, P.; Curtil, C.; De Bonis, G.; Decowski, M. P.; Dekeyser, I.; Deschamps, A.; Distefano, C.; Donzaud, C.; Dornic, D.; Drouhin, D.; Eberl, T.; Emanuele, U.; Ernenwein, J. P.; Escoffier, S.; Fehr, F.; Flaminio, V.; Fratini, K.; Fritsch, U.; Fuda, J. L.; Giacomelli, G.; Gómez-González, J. P.; Graf, K.; Guillard, G.; Halladjian, G.; Hallewell, G.; Heijboer, A. J.; Hello, Y.; Hernández-Rey, J. J.; Hößl, J.; de Jong, M.; Kalantar-Nayestanaki, N.; Kalekin, O.; Kappes, A.; Katz, U.; Kooijman, P.; Kopper, C.; Kouchner, A.; Kretschmer, W.; Lahmann, R.; Lamare, P.; Lambard, G.; Larosa, G.; Laschinsky, H.; Lefèvre, D.; Lelaizant, G.; Lim, G.; Lo Presti, D.; Loehner, H.; Loucatos, S.; Lucarelli, F.; Lyons, K.; Mangano, S.; Marcelin, M.; Margiotta, A.; Martinez-Mora, J. A.; Maurin, G.; Mazure, A.; Melissas, M.; Montaruli, T.; Morganti, M.; Moscoso, L.; Motz, Holger Martin; Naumann, C.; Neff, M.; Ostasch, R.; Palioselitis, G.; Pâvâlaş, G. E.; Payre, P.; Petrovic, J.; Piattelli, P.; Picot-Clemente, N.; Picq, C.; Pillet, R.; Popa, V.; Pradier, T.; Presani, E.; Racca, C.; Radu, A.; Reed, C.; Riccobene, G.; Richardt, C.; Rujoiu, M.; Russo, G. V.; Salesa, F.; Schoeck, F.; Schuller, J. P.; Shanidze, R.; Simeone, F.; Spurio, M.; Steijger, J. J M; Stolarczyk, T.; Tamburini, C.; Tasca, L.; Toscano, S.; Vallage, B.; Van Elewyck, V.; Vecchi, M.; Vernin, P.; Wijnker, G.; de Wolf, E.; Yepes, H.; Zaborov, D.; Zornoza, J. D.; Zúñiga, J.

In: Deep-Sea Research Part I: Oceanographic Research Papers, Vol. 58, No. 8, 08.2011, p. 875-884.

Research output: Contribution to journalArticle

Van Haren, H, Taupier-Letage, I, Aguilar, JA, Albert, A, Anghinolfi, M, Anton, G, Anvar, S, Ardid, M, Assis Jesus, AC, Astraatmadja, T, Aubert, JJ, Auer, R, Baret, B, Basa, S, Bazzotti, M, Bertin, V, Biagi, S, Bigongiari, C, Bou-Cabo, M, Bouwhuis, MC, Brown, A, Brunner, J, Busto, J, Camarena, F, Capone, A, Carminati, G, Carr, J, Castel, D, Castorina, E, Cavasinni, V, Cecchini, S, Charvis, P, Chiarusi, T, Circella, M, Coniglione, R, Costantini, H, Cottini, N, Coyle, P, Curtil, C, De Bonis, G, Decowski, MP, Dekeyser, I, Deschamps, A, Distefano, C, Donzaud, C, Dornic, D, Drouhin, D, Eberl, T, Emanuele, U, Ernenwein, JP, Escoffier, S, Fehr, F, Flaminio, V, Fratini, K, Fritsch, U, Fuda, JL, Giacomelli, G, Gómez-González, JP, Graf, K, Guillard, G, Halladjian, G, Hallewell, G, Heijboer, AJ, Hello, Y, Hernández-Rey, JJ, Hößl, J, de Jong, M, Kalantar-Nayestanaki, N, Kalekin, O, Kappes, A, Katz, U, Kooijman, P, Kopper, C, Kouchner, A, Kretschmer, W, Lahmann, R, Lamare, P, Lambard, G, Larosa, G, Laschinsky, H, Lefèvre, D, Lelaizant, G, Lim, G, Lo Presti, D, Loehner, H, Loucatos, S, Lucarelli, F, Lyons, K, Mangano, S, Marcelin, M, Margiotta, A, Martinez-Mora, JA, Maurin, G, Mazure, A, Melissas, M, Montaruli, T, Morganti, M, Moscoso, L, Motz, HM, Naumann, C, Neff, M, Ostasch, R, Palioselitis, G, Pâvâlaş, GE, Payre, P, Petrovic, J, Piattelli, P, Picot-Clemente, N, Picq, C, Pillet, R, Popa, V, Pradier, T, Presani, E, Racca, C, Radu, A, Reed, C, Riccobene, G, Richardt, C, Rujoiu, M, Russo, GV, Salesa, F, Schoeck, F, Schuller, JP, Shanidze, R, Simeone, F, Spurio, M, Steijger, JJM, Stolarczyk, T, Tamburini, C, Tasca, L, Toscano, S, Vallage, B, Van Elewyck, V, Vecchi, M, Vernin, P, Wijnker, G, de Wolf, E, Yepes, H, Zaborov, D, Zornoza, JD & Zúñiga, J 2011, 'Acoustic and optical variations during rapid downward motion episodes in the deep north-western Mediterranean Sea', Deep-Sea Research Part I: Oceanographic Research Papers, vol. 58, no. 8, pp. 875-884. https://doi.org/10.1016/j.dsr.2011.06.006
Van Haren, H. ; Taupier-Letage, I. ; Aguilar, J. A. ; Albert, A. ; Anghinolfi, M. ; Anton, G. ; Anvar, S. ; Ardid, M. ; Assis Jesus, A. C. ; Astraatmadja, T. ; Aubert, J. J. ; Auer, R. ; Baret, B. ; Basa, S. ; Bazzotti, M. ; Bertin, V. ; Biagi, S. ; Bigongiari, C. ; Bou-Cabo, M. ; Bouwhuis, M. C. ; Brown, A. ; Brunner, J. ; Busto, J. ; Camarena, F. ; Capone, A. ; Carminati, G. ; Carr, J. ; Castel, D. ; Castorina, E. ; Cavasinni, V. ; Cecchini, S. ; Charvis, P. ; Chiarusi, T. ; Circella, M. ; Coniglione, R. ; Costantini, H. ; Cottini, N. ; Coyle, P. ; Curtil, C. ; De Bonis, G. ; Decowski, M. P. ; Dekeyser, I. ; Deschamps, A. ; Distefano, C. ; Donzaud, C. ; Dornic, D. ; Drouhin, D. ; Eberl, T. ; Emanuele, U. ; Ernenwein, J. P. ; Escoffier, S. ; Fehr, F. ; Flaminio, V. ; Fratini, K. ; Fritsch, U. ; Fuda, J. L. ; Giacomelli, G. ; Gómez-González, J. P. ; Graf, K. ; Guillard, G. ; Halladjian, G. ; Hallewell, G. ; Heijboer, A. J. ; Hello, Y. ; Hernández-Rey, J. J. ; Hößl, J. ; de Jong, M. ; Kalantar-Nayestanaki, N. ; Kalekin, O. ; Kappes, A. ; Katz, U. ; Kooijman, P. ; Kopper, C. ; Kouchner, A. ; Kretschmer, W. ; Lahmann, R. ; Lamare, P. ; Lambard, G. ; Larosa, G. ; Laschinsky, H. ; Lefèvre, D. ; Lelaizant, G. ; Lim, G. ; Lo Presti, D. ; Loehner, H. ; Loucatos, S. ; Lucarelli, F. ; Lyons, K. ; Mangano, S. ; Marcelin, M. ; Margiotta, A. ; Martinez-Mora, J. A. ; Maurin, G. ; Mazure, A. ; Melissas, M. ; Montaruli, T. ; Morganti, M. ; Moscoso, L. ; Motz, Holger Martin ; Naumann, C. ; Neff, M. ; Ostasch, R. ; Palioselitis, G. ; Pâvâlaş, G. E. ; Payre, P. ; Petrovic, J. ; Piattelli, P. ; Picot-Clemente, N. ; Picq, C. ; Pillet, R. ; Popa, V. ; Pradier, T. ; Presani, E. ; Racca, C. ; Radu, A. ; Reed, C. ; Riccobene, G. ; Richardt, C. ; Rujoiu, M. ; Russo, G. V. ; Salesa, F. ; Schoeck, F. ; Schuller, J. P. ; Shanidze, R. ; Simeone, F. ; Spurio, M. ; Steijger, J. J M ; Stolarczyk, T. ; Tamburini, C. ; Tasca, L. ; Toscano, S. ; Vallage, B. ; Van Elewyck, V. ; Vecchi, M. ; Vernin, P. ; Wijnker, G. ; de Wolf, E. ; Yepes, H. ; Zaborov, D. ; Zornoza, J. D. ; Zúñiga, J. / Acoustic and optical variations during rapid downward motion episodes in the deep north-western Mediterranean Sea. In: Deep-Sea Research Part I: Oceanographic Research Papers. 2011 ; Vol. 58, No. 8. pp. 875-884.
@article{260ff22cdc584f6a8611e9f615986357,
title = "Acoustic and optical variations during rapid downward motion episodes in the deep north-western Mediterranean Sea",
abstract = "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 170m above the sea bed at 2475m. The ADCP measured downward vertical currents of magnitudes up to 0.03ms-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 0.35ms-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'.",
keywords = "Acoustic ADCP observations, ANTARES neutrino telescope, Bioluminescence, Deep Mediteranean, Dense water formation, Episodic downward current, Northern boundary current, Optical photo-multiplier observations",
author = "{Van Haren}, H. and I. Taupier-Letage and Aguilar, {J. A.} and A. Albert and M. Anghinolfi and G. Anton and S. Anvar and M. Ardid and {Assis Jesus}, {A. C.} and T. Astraatmadja and Aubert, {J. J.} and R. Auer and B. Baret and S. Basa and M. Bazzotti and V. Bertin and S. Biagi and C. Bigongiari and M. Bou-Cabo and Bouwhuis, {M. C.} and A. Brown and J. Brunner and J. Busto and F. Camarena and A. Capone and G. Carminati and J. Carr and D. Castel and E. Castorina and V. Cavasinni and S. Cecchini and P. Charvis and T. Chiarusi and M. Circella and R. Coniglione and H. Costantini and N. Cottini and P. Coyle and C. Curtil and {De Bonis}, G. and Decowski, {M. P.} and I. Dekeyser and A. Deschamps and C. Distefano and C. Donzaud and D. Dornic and D. Drouhin and T. Eberl and U. Emanuele and Ernenwein, {J. P.} and S. Escoffier and F. Fehr and V. Flaminio and K. Fratini and U. Fritsch and Fuda, {J. L.} and G. Giacomelli and G{\'o}mez-Gonz{\'a}lez, {J. P.} and K. Graf and G. Guillard and G. Halladjian and G. Hallewell and Heijboer, {A. J.} and Y. Hello and Hern{\'a}ndez-Rey, {J. J.} and J. H{\"o}{\ss}l and {de Jong}, M. and N. Kalantar-Nayestanaki and O. Kalekin and A. Kappes and U. Katz and P. Kooijman and C. Kopper and A. Kouchner and W. Kretschmer and R. Lahmann and P. Lamare and G. Lambard and G. Larosa and H. Laschinsky and D. Lef{\`e}vre and G. Lelaizant and G. Lim and {Lo Presti}, D. and H. Loehner and S. Loucatos and F. Lucarelli and K. Lyons and S. Mangano and M. Marcelin and A. Margiotta and Martinez-Mora, {J. A.} and G. Maurin and A. Mazure and M. Melissas and T. Montaruli and M. Morganti and L. Moscoso and Motz, {Holger Martin} and C. Naumann and M. Neff and R. Ostasch and G. Palioselitis and P{\^a}v{\^a}laş, {G. E.} and P. Payre and J. Petrovic and P. Piattelli and N. Picot-Clemente and C. Picq and R. Pillet and V. Popa and T. Pradier and E. Presani and C. Racca and A. Radu and C. Reed and G. Riccobene and C. Richardt and M. Rujoiu and Russo, {G. V.} and F. Salesa and F. Schoeck and Schuller, {J. P.} and R. Shanidze and F. Simeone and M. Spurio and Steijger, {J. J M} and T. Stolarczyk and C. Tamburini and L. Tasca and S. Toscano and B. Vallage and {Van Elewyck}, V. and M. Vecchi and P. Vernin and G. Wijnker and {de Wolf}, E. and H. Yepes and D. Zaborov and Zornoza, {J. D.} and J. Z{\'u}{\~n}iga",
year = "2011",
month = "8",
doi = "10.1016/j.dsr.2011.06.006",
language = "English",
volume = "58",
pages = "875--884",
journal = "Deep-Sea Research Part I: Oceanographic Research Papers",
issn = "0967-0637",
publisher = "Elsevier Limited",
number = "8",

}

TY - JOUR

T1 - Acoustic and optical variations during rapid downward motion episodes in the deep north-western Mediterranean Sea

AU - Van Haren, H.

AU - Taupier-Letage, I.

AU - Aguilar, J. A.

AU - Albert, A.

AU - Anghinolfi, M.

AU - Anton, G.

AU - Anvar, S.

AU - Ardid, M.

AU - Assis Jesus, A. C.

AU - Astraatmadja, T.

AU - Aubert, J. J.

AU - Auer, R.

AU - Baret, B.

AU - Basa, S.

AU - Bazzotti, M.

AU - Bertin, V.

AU - Biagi, S.

AU - Bigongiari, C.

AU - Bou-Cabo, M.

AU - Bouwhuis, M. C.

AU - Brown, A.

AU - Brunner, J.

AU - Busto, J.

AU - Camarena, F.

AU - Capone, A.

AU - Carminati, G.

AU - Carr, J.

AU - Castel, D.

AU - Castorina, E.

AU - Cavasinni, V.

AU - Cecchini, S.

AU - Charvis, P.

AU - Chiarusi, T.

AU - Circella, M.

AU - Coniglione, R.

AU - Costantini, H.

AU - Cottini, N.

AU - Coyle, P.

AU - Curtil, C.

AU - De Bonis, G.

AU - Decowski, M. P.

AU - Dekeyser, I.

AU - Deschamps, A.

AU - Distefano, C.

AU - Donzaud, C.

AU - Dornic, D.

AU - Drouhin, D.

AU - Eberl, T.

AU - Emanuele, U.

AU - Ernenwein, J. P.

AU - Escoffier, S.

AU - Fehr, F.

AU - Flaminio, V.

AU - Fratini, K.

AU - Fritsch, U.

AU - Fuda, J. L.

AU - Giacomelli, G.

AU - Gómez-González, J. P.

AU - Graf, K.

AU - Guillard, G.

AU - Halladjian, G.

AU - Hallewell, G.

AU - Heijboer, A. J.

AU - Hello, Y.

AU - Hernández-Rey, J. J.

AU - Hößl, J.

AU - de Jong, M.

AU - Kalantar-Nayestanaki, N.

AU - Kalekin, O.

AU - Kappes, A.

AU - Katz, U.

AU - Kooijman, P.

AU - Kopper, C.

AU - Kouchner, A.

AU - Kretschmer, W.

AU - Lahmann, R.

AU - Lamare, P.

AU - Lambard, G.

AU - Larosa, G.

AU - Laschinsky, H.

AU - Lefèvre, D.

AU - Lelaizant, G.

AU - Lim, G.

AU - Lo Presti, D.

AU - Loehner, H.

AU - Loucatos, S.

AU - Lucarelli, F.

AU - Lyons, K.

AU - Mangano, S.

AU - Marcelin, M.

AU - Margiotta, A.

AU - Martinez-Mora, J. A.

AU - Maurin, G.

AU - Mazure, A.

AU - Melissas, M.

AU - Montaruli, T.

AU - Morganti, M.

AU - Moscoso, L.

AU - Motz, Holger Martin

AU - Naumann, C.

AU - Neff, M.

AU - Ostasch, R.

AU - Palioselitis, G.

AU - Pâvâlaş, G. E.

AU - Payre, P.

AU - Petrovic, J.

AU - Piattelli, P.

AU - Picot-Clemente, N.

AU - Picq, C.

AU - Pillet, R.

AU - Popa, V.

AU - Pradier, T.

AU - Presani, E.

AU - Racca, C.

AU - Radu, A.

AU - Reed, C.

AU - Riccobene, G.

AU - Richardt, C.

AU - Rujoiu, M.

AU - Russo, G. V.

AU - Salesa, F.

AU - Schoeck, F.

AU - Schuller, J. P.

AU - Shanidze, R.

AU - Simeone, F.

AU - Spurio, M.

AU - Steijger, J. J M

AU - Stolarczyk, T.

AU - Tamburini, C.

AU - Tasca, L.

AU - Toscano, S.

AU - Vallage, B.

AU - Van Elewyck, V.

AU - Vecchi, M.

AU - Vernin, P.

AU - Wijnker, G.

AU - de Wolf, E.

AU - Yepes, H.

AU - Zaborov, D.

AU - Zornoza, J. D.

AU - Zúñiga, J.

PY - 2011/8

Y1 - 2011/8

N2 - 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 170m above the sea bed at 2475m. The ADCP measured downward vertical currents of magnitudes up to 0.03ms-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 0.35ms-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'.

AB - 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 170m above the sea bed at 2475m. The ADCP measured downward vertical currents of magnitudes up to 0.03ms-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 0.35ms-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'.

KW - Acoustic ADCP observations

KW - ANTARES neutrino telescope

KW - Bioluminescence

KW - Deep Mediteranean

KW - Dense water formation

KW - Episodic downward current

KW - Northern boundary current

KW - Optical photo-multiplier observations

UR - http://www.scopus.com/inward/record.url?scp=79960463750&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=79960463750&partnerID=8YFLogxK

U2 - 10.1016/j.dsr.2011.06.006

DO - 10.1016/j.dsr.2011.06.006

M3 - Article

AN - SCOPUS:79960463750

VL - 58

SP - 875

EP - 884

JO - Deep-Sea Research Part I: Oceanographic Research Papers

JF - Deep-Sea Research Part I: Oceanographic Research Papers

SN - 0967-0637

IS - 8

ER -