RRS James Clark Ross Cruise 163, 07 Dec-15 Dec 2006. Drake Passage Repeat Hydrography: WOCE Southern Repeat Section 1b - Burdwood Bank to Elephant Island

Abstract

This report describes the twelfth repeat hydrography section across Drake Passage, first
established during the World Ocean Circulation Experiment. For this work NOC made use
of the regular BAS supply trip to Rothera from the Falklands using the RRS James Clark
Ross. Thirty CTD/LADCP stations were carried out across the 753 km section from
Burdwood Bank to Elephant Island, plus one test station in the deep waters to the north of
Burdwood Bank. Maximum station spacing on the section was 33 km, with stations closer
together on the continental shelves. Water samples were drawn for salinity analysis, for
subsequent CTD conductivity calibration. Samples were also drawn for analysis of oxygen
isotope fraction ?18O, for later analysis back at NOC. The CTD was a SeaBird 911plus with
dual temperature and conductivity sensors. There were two LADCP instruments, but no
useful data were collected with them. Various underway measurements were also collected,
including navigation, vessel-mounted ADCP, sea surface temperature and salinity, water
depth and meteorological parameters. Water samples were also collected for subsequent
analysis for chlorophyll, particulate carbon and biogenic silica.

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