Examining the plankton acoustic response with a vessel mounted adcp across oceanic fronts located in the drake passage

On December 2001 and January 2006, during the LMGO1 -9 and LMG06-1 cruises to Antarctic Peninsula, at-sea oceanographic and acoustic measurements were conducted onboard the R/V L. M. Gould icebreaker along two transects located between (55.15 °S, 65 °W) and (64.65 °S, 65 °W) and between (55.15 °S, 6...

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Detalles Bibliográficos
Autores principales: Blanc, Silvia, Baqués, Michèle, Etcheverry de Milou, Marta I.
Formato: Articulo
Lenguaje:Español
Publicado: 2008
Materias:
Geofísica
ADCP
volume sound scattering
Drake Passage
Dispersión del volumen del sonido
Pasaje de Drake
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/132851
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-132851
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Español
topic Geofísica
ADCP
volume sound scattering
Drake Passage
Dispersión del volumen del sonido
Pasaje de Drake
spellingShingle Geofísica
ADCP
volume sound scattering
Drake Passage
Dispersión del volumen del sonido
Pasaje de Drake
Blanc, Silvia
Baqués, Michèle
Etcheverry de Milou, Marta I.
Examining the plankton acoustic response with a vessel mounted adcp across oceanic fronts located in the drake passage
topic_facet Geofísica
ADCP
volume sound scattering
Drake Passage
Dispersión del volumen del sonido
Pasaje de Drake
description On December 2001 and January 2006, during the LMGO1 -9 and LMG06-1 cruises to Antarctic Peninsula, at-sea oceanographic and acoustic measurements were conducted onboard the R/V L. M. Gould icebreaker along two transects located between (55.15 °S, 65 °W) and (64.65 °S, 65 °W) and between (55.15 °S, 64.91 °W) and (62.7 °S, 62.21 °W), respectively. The scientific crew consisted of researchers from two US institutes and a scientific observer from the Argentinean Naval Service of Research & Development under the frame of the US National Science Foundation Antarctic Program. The present work accomplishes an alternative application for a vessel-mounted Acoustic Doppler Current Profiler (ADCP) with an operating frequency of 153.6 kHz. Volume Acoustic Backscattering Strengths, were computed from the recorded ADCP’s voltages. The obtained values fell in a range of-92 dB to -62 dB, for the layer of the water column comprised between 26 m - 300 m on 2001 and in the range of-93 dB to -58 dB for the water column between 22 m - 300 m on 2006. Depth-averaged Sv for the upper water column (about the first 150 m) on experiment transects were computed as well as Sv values averaged in depth and latitude. Data processing revealed interesting features about the upper ocean acoustic behaviour. On December 2001 a significant non-uniform scattering response in the ensonified water column with quite high values of Sy associated with the diel vertical migration, was obtained. Additionally, a remarkable increment in the scattering response was observed at the estimated location of the Antarctic Divergence (AD). This feature was also observed on January 2006 in addition to remarkable high values of in coastal waters of the Antarctic Peninsula. Plotting and exhaustive analyses of Sv (z) profiles enabled the visualisation of three distinct types of qualitative patterns, namely, curves with: (I) two observable maxima, (II) only one maximum, (III) a depth-interval of variable width with a minimum acoustic response. Along the experiment transects the obtained results suggest an eventual correlation between the three distinct obtained behaviours of the backscattered acoustic intensity and the oceanic fronts location, leading us to consider the feasibility of using the Sy(z) profiles, as an eventual indicator of oceanic fronts and eddies’ presence.
format Articulo
Articulo
author Blanc, Silvia
Baqués, Michèle
Etcheverry de Milou, Marta I.
author_facet Blanc, Silvia
Baqués, Michèle
Etcheverry de Milou, Marta I.
author_sort Blanc, Silvia
title Examining the plankton acoustic response with a vessel mounted adcp across oceanic fronts located in the drake passage
title_short Examining the plankton acoustic response with a vessel mounted adcp across oceanic fronts located in the drake passage
title_full Examining the plankton acoustic response with a vessel mounted adcp across oceanic fronts located in the drake passage
title_fullStr Examining the plankton acoustic response with a vessel mounted adcp across oceanic fronts located in the drake passage
title_full_unstemmed Examining the plankton acoustic response with a vessel mounted adcp across oceanic fronts located in the drake passage
title_sort examining the plankton acoustic response with a vessel mounted adcp across oceanic fronts located in the drake passage
publishDate 2008
url http://sedici.unlp.edu.ar/handle/10915/132851
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AT baquesmichele examiningtheplanktonacousticresponsewithavesselmountedadcpacrossoceanicfrontslocatedinthedrakepassage
AT etcheverrydemiloumartai examiningtheplanktonacousticresponsewithavesselmountedadcpacrossoceanicfrontslocatedinthedrakepassage
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