GDAC Pre-Cruise Metadata form
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E-mail: [email protected]/ [email protected]
Cruise Name: [any identifier (acronyms)
including technical name]
AGU 018 - South African National Antarctic Expedition (SANAE 55)/
Southern Ocean Seasonal Cycle experiment (SOSCEx III)
Platform Name and type: [vessel, mooring, satellite, towed vehicle]
RV SA Agulhas II
Project: [associated project or program name related to funding]
Southern Ocean Seasonal Cycle Experiment III, not funded by GEOTRACES
Lead Nation: South Africa
Chief Scientist (Lead Scientist / Principal Investigator) contact details
Name (including title):
Email:
Dr. P Monteiro
[email protected]
Phone (including country
code): +27 (0) 21 888 2414
Mailing Address:
Jan Celliers Drive
CSIR,
P.O Box 320
Stellenbosch
7599
South Africa
Co-Chief Scientist contact details: [GEOTRACES point of contact if different from Chief Scientist]
Name (including title): Prof AN Roychoudhury
Email: [email protected]
Phone (including country
code): +27 21 808 3124
Mailing Address: Department of Earth Sciences, University of Stellenbosch, Stellenbosch, 7602,
South Africa
Cruise Details
Start Port and Country:
Start date:
V&A Water front, East Pier, Cape Town
Winter cruise (22 July 2015); summer cruise (05
December 2015)
End Port and Country:
End Date:
V&A Water front, East Pier, Cape Town
Winter cruise (15 August 2015); summer cruise (11
February 2016)
Location: [general description of study area; map/ cruise track/ coordinates if possible]
GDAC Pre-Cruise Metadata form
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Figure 1: SANAE 55/SOSCEx III cruise track and stations as indicated by black dots. Process
stations (PS1: 42.7S; 08.7E), (PS2: 45.001S; 06.562E), BIO2 (45.998S; 06.562E), BIO3 (50.451S;
01.058E), BIO4 (54.00S; 00.00E/W).
Cruise Overview: [proposal abstract]
For SOSCEx III cruise proposal abstract see Swart, Chan, Fauchereau et al., Southern Ocean Seasonal Cycle
Experiment 2012: Seasonal scale climate and carbon cycle links. S Afr. J Sci. 2012;108(3/4), Art. #1089, 3 pages.
http://dx.doi.org/10.4102/sajs.v108i3/4.1089.
SOSCEx is a CSIR-led consortium (that includes Stellenbosch University, UCT, and numerous international
partners) whose overall aim is to provide more reliable predictions of the response of the Southern Ocean
carbon cycle to climate change through an improved understanding of its sensitivity to seasonal,
subseasonal and mesoscale forcing scales. SOSCEx III aims to achieve this by using a combination of ship
based process studies, autonomous platforms (gliders, bio-optics, pCO2 wave rider), models and remote
sensing analysis that focuses on the link between the physical forcing mechanisms and the biogeochemical
responses over these relevant time and space scales. This combined high-resolution approach to both
observations and modelling experiments will permit us, for the first time, to address some key questions
relating to the physical nature of the Southern Ocean and its carbon cycle.
The Southern Ocean upper water column processes, which are important to seasonal productivity and
carbon fluxes, undergo an annual re-set during the winter when net heat losses lead to deep mixing aided
GDAC Pre-Cruise Metadata form
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by elevated wind stress and sea ice formation. This winter re-set is a key initial condition to the following
summer cycle in terms of iron and nitrate supply for productivity, carbon equilibration with the atmosphere
and exchange between the upper and deep ocean. The winter part of the seasonal cycle is a big gap in our
attempts to get a seasonally unbiased understanding of annual carbon flux. Being able to measure all the
relevant parameters on the winter 2015 cruise along the GoodHope line will allow a first ever appreciation
of what the winter reset values of the system are, and more importantly a comparative summer crossing of
the same line will allow a comparison between winter time supply and summertime response.
Inter-calibration efforts: Please provide details of how each element will be calibrated to meet the requirements
of the GEOTRACES programme e.g. use of SaFe standards, collaborative sampling, cross-over stations (latitudes
and longitudes of the cross over stations, the cruise which you are crossing with and the station numbers):
The SOSCEx III cruise will have a cross-over station with the ANT XXIV3 expedition (Klunder et al., 2011) at the
ACCs, station 116, Latitude 54.00°S; Longitude 00.003°E, SMLD = 102, bottom depth = 2397.5m.
SaFe and Geotraces standards will be analyzed with the samples
Internal standard for Stellenbosch University trace-clean laboratory is also being created.
Anticipated list of parameters to be submitted to GDAC: Key parameters listed - please list any other
parameters measured and the PI’s contact information. Also include information in regards to the phase i.e. dissolved
or particulate and how the samples were collected. i.e. Fe (dissolved)- CTD –Bottle or Fe (dissolved) – insitu
pumps
Trace elements:
x Fe
Al
Zn
Mn
Cd
Cu
Other
Other
Other
Radioactive
isotopes:
230
Th
231
Pa
Other
Other
Contact for each element (PI); [full name,
organisation and email] if known at this stage
Phase
T. Mtshali, CSIR, [email protected];
A. Roychoudhury: SUN, [email protected]
-Dissolved Fe (dFe) – CTD trace clean
GoFlo bottles
GDAC Pre-Cruise Metadata form
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Other
Other
Stable isotopes:
C 15N
Other

Radiogenic
isotopes:
Nd isotopes
Pb isotopes
Other
NON TEI data set
(add as required)
X Nutrients
X CTD
P Monteiro, [email protected]
Other parameters:
Other relevant information to note at this stage:
Dissolved, trace clean GoFlo bottles