The Southern Ocean S04P repeat hydrographic line was reoccupied for the US
Global Ocean Carbon and Repeat Hydrography Program (sometimes referred to
as "CLIVAR/C02") during February-April 2011 from RVIB Nathaniel B. Palmer
via a survey consisting of CTD/rosette/LADCP stations, trace-metal
stations, and a variety of underway measurements. The ship departed
McMurdo, Antarctica, on 19 February 2011 and arrived Punta Arenas, Chile,
on 23 April 2011 (UTC dates).

A total of 140 stations were occupied with one CTD/rosette/LADCP cast
completed at each. The expedition included in addition to the S04P transect
reoccupations of segments of lines P16S and P15S, and one station
overlapping with P18S (NBP-1 102 stations 46-66, 77-96 and 118,
respectively). CTDO profiles were collected with minimal water sampling in
the vicinity of three mooring sites (stations 67-76 and 103-104). CTDO data
and water samples were collected on each CTD/rosette/LADCP cast, usually to
within 10 meters of the bottom. Water samples were measured on board for
salinity, dissolved oxygen, nutrients, DIC, pH, total alkalinity, and CFCs.
Additional water samples were collected and stored for shore analyses of
helium, tritium, 0-18, DOC/DON, 13C/14C, chromophoric dissolved organic
matter (CDOM), phytoplankton pigments, particulate absorption and image
cytoplankton, and density.

Carbon Data
CTD and other hydrographic data
Section designation: S04P
Chief Scientists: James H. Swift and Alex Orsi
Dates: 19 Feb 2011 to 23 April 2011
Ship: RVIB Nathaniel B. Palmer
Ports of call: McMurdo, Antarctica to Punta Arenas Chile
Stations: 140
Geographic boundaries 77° 20.9' S to 66° 12.6' S by 168° 4.8' E to 72° 40.76' W

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