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RRS Charles Darwin Cruise 143, 22 Nov-20 Dec 2002. SCHEHEREZADE II: Geological and biological surveys of the Arabian Sea and the continental slope of Oman

Jacobs, C.L.. 2003 RRS Charles Darwin Cruise 143, 22 Nov-20 Dec 2002. SCHEHEREZADE II: Geological and biological surveys of the Arabian Sea and the continental slope of Oman. Southampton, UK, Southampton Oceanography Centre, 79pp. (Southampton Oceanography Centre Cruise Report 42)

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Abstract/Summary

This 28 day cruise was planned to investigate the geophysical and biological interactions in benthic environments in the Gulf of Oman and north-western Arabian Sea. The main objectives of the cruise were to produce a map of the bathymetry of the area and to investigate the geological processes that are, and have in the recent past been, active and look at the influence of the benthic community and activity on sediment acoustic properties. In fact the topography of the study area was vastly different to that indicated on the GEBCO or gravity-derived bathymetry maps, which had indicated a generally smooth continental slope running parallel to the coast. The reality was that this part of the Oman margin is highly incised by numerous submarine canyon systems, some of which are 4km in width in mid-slope and hundreds of metres deep. Thus the cruise objectives were modified slightly to incorporate an investigation of the influence of the canyons on the fauna and the Oxygen Minimum Zone (OMZ). Following successful EM12 multibeam mapping and the production of both contours and acoustic backscatter maps, over 120 stations were occupied to help us characterise the interactions between the biota and sediments, station work included intensive sampling of one transect in the north of the area and a comprehensive southern sampling transect for comparative studies. High resolution geophysics and photographic stations were also undertaken. Virtually all of the interpretive work will be carried out post-cruise.

Item Type: Publication - Report (UNSPECIFIED)
Additional Keywords: Agassiz trawl, Arabian Sea, bathymetry, benthic communities, biological surveys, Charles Darwin, cruise 143 2002, CTD observations, EM12, geological surveys, Kasten corer, megacore, mini profiler vehicle, MPV, multibeam surveys, Oman Gulf, oxygen minimum zone, piston coring, SCHEHEREZADE II, SHRIMP, sound velocity probe, SVP
Date made live: 29 Jun 2004 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/108039

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