Dissolved Inorganic Carbon (DIC) concentrations from CTD from R/V Tangaroa cruise 61TG_3052 in the Southern Ocean in 1999 (SOIREE project)

Website: https://www.bco-dmo.org/dataset/2840
Version: 10August2009
Version Date: 2009-08-10

» Southern Ocean Iron Release Experiment (SOIREE)

» Iron Synthesis (FeSynth)
Bakker, Dorothee C.E.University of East Anglia (UEA)Principal Investigator
Watson, Andrew J.University of East Anglia (UEA)Co-Principal Investigator
Mackie, DougUniversity of OtagoContact
Gegg, Stephen R.Woods Hole Oceanographic Institution (WHOI)BCO-DMO Data Manager

Dataset Description

Note: DIC CTD data are final, except for station 1168!!!!!

DICrun1 and DICrun2: DIC values using a running mean over the
Dickson values for the actual (3x), preceding (1x) and succeeding cell
(1x). The DIC values using the running mean for the Dickson values
have a better reproducibility for duplicate samples than, if we use the
Dickson value for each cell.

Replicate DIC samples from the CTD:
The average difference between duplicates from the CTD
With running mean of Dickson value:
mean = 2.7 umol/kg, stdev = 2.5 umol/kg, n = 18

Methods & Sampling

Data Processing Description

See SOIREE Preliminary Voyage Report

BCO-DMO Processing Notes

Generated from original spreadsheet DIC_CTD.xls
provided on the Deep-Sea Research II 48 (2001) accompanying CD-Rom


- parameter names modified to conform to BCO-DMO convention

- blank lines removed

- Station Number changed to station

- added 'T' to CTD Station number for compatibility with events in other spreadsheets

- date reformatted to YYYYMMDD

- time reformatted to HHMM

- date, time. Lat, lon added from SOIREE_CTD_at_Bottle_Trip_Data_FINAL.xls

- CTD data recs with no data in any fields deleted from file

- 'NaN' changed to 'nd'

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Data Files

(Comma Separated Values (.csv), 47.93 KB)
Primary data file for dataset ID 2840

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stationStation Id (Text String) text
datedate YYYYMMDD
lonlongitude, negative denotes West decimal degrees
latlatitude, negative denotes South decimal degrees
timetime HHMM
castCTD cast number integer
tripNiskin integer
pressCTD Pressure decibars
tempCTD Temperature (ITS-90) degrees celsius
salCTD Salinity (PSS-78) dimensionless
DICrun1DIC values Run 1 umol/kg
DICrun2DIC values Run 2 umol/kg

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R/V Tangaroa
Start Date
End Date
Cruise to the Southern Ocean as part of the Fe Sythesis project whose aim was to maintain a coherent patch of iron-enriched seawater for the duration of SOIREE and to interpret any iron-mediated effects on the patch by conducting measurements and performing experiments during this period.

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Project Information

Southern Ocean Iron Release Experiment (SOIREE)

Coverage: Southern Ocean

Project in the Southern Ocean aimed at maintaining a coherent patch of iron-enriched seawater for the duration of project and to interpret any iron-mediated effects on the patch by conducting measurements and performing experiments during this period of the project.

The Southern Ocean Iron RElease Experiment (SOIREE), was the first in situ iron fertilization experiment performed in the polar waters of the Southern Ocean. SOIREE was an interdisciplinary study involving participants from six countries, and took place in February 1999 south of the Polar Front in the Australasian-Pacific sector of the Southern Ocean.

Approximately 3800 kg of acidified FeSO4.7H2O and 165 g of the tracer sulphur hexafluoride (SF6) were added to a 65-m deep surface mixed layer over an area of ~50 km2. Initially, mean dissolved iron concentrations were ~2.7 nM, but decreased to ambient levels within days, requiring subsequent additions of 1550-1750 kg of acidified FeSO4.7H2O on days 3, 5 and 7 of the experiment.

During the 13-day site occupation, there were iron-mediated increases in phytoplankton growth rates, with marked increases in chlorophyll a (up to 2 µgl-1) and production rates (up to 1.3 gCm-2d-1). These resulted in subsequent changes in the pelagic ecosystem structure, and in the cycling of carbon, silica and sulphur, such as a 10% drawdown of surface CO2.

The SOIREE bloom persisted for >40 days following our departure from the site, as observed via SeaWiFS remotely sensed observations of Ocean Colour.

All original data and metadata provided on a CD-Rom accompanying the Deep-Sea Research II 48 (2001) volume. The CD-Rom contains the main SOIREE datasets and ancillary information including the pre-experiment 'desktop' database study for site-selection, and satellite images of the SOIREE bloom.
© 2001 Elsevier Science Ltd. All rights reserved.

Related files

SOIREE Preliminary Voyage Report
SOIREE Introduction and Summary, Deep-Sea Research II 48 (2001) 2425-2438
SOIREE Cruise Track

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Program Information

Iron Synthesis (FeSynth)

Coverage: Global

The two main objectives of the Iron Synthesis program (SCOR Working Group proposal, 2005), are:
1. Data compilation: assembling a common open-access database of the in situ iron experiments, beginning with the first period (1993-2002; Ironex-1, Ironex-2, SOIREE, EisenEx, SEEDS-1; SOFeX, SERIES) where primary articles have already been published, to be followed by the 2004 experiments where primary articles are now in progress (EIFEX, SEEDS-2; SAGE, FeeP); similarly for the natural fertilizations S.O.JGOFS (1992), CROZEX (2004/2005) and KEOPS (2005).

2. Modeling and data synthesis of specific aspects of two or more such experiments for various topics such as physical mixing, phytoplankton productivity, overall ecosystem functioning, iron chemistry, CO2 budgeting, nutrient uptake ratios, DMS(P) processes, and combinations of these variables and processes.

SCOR Working Group proposal, 2005. "The Legacy of in situ Iron Enrichments: Data Compilation and Modeling".

See also: SCOR Proceedings Vol. 42 Concepcion, Chile October 2006, pgs: 13-16 2.3.3 Working Group on The Legacy of in situ Iron Enrichments: Data Compilation and Modeling.

The first objective of the Iron Synthesis program involves a data recovery effort aimed at assembling a common, open-access database of data and metadata from a series of in-situ ocean iron fertilization experiments conducted between 1993 and 2005. Initially, funding for this effort is being provided by the Scientific Committee on Oceanic Research (SCOR) and the U.S. National Science Foundation (NSF).

Through the combined efforts of the principal investigators of the individual projects and the staff of Biological and Chemical Oceanography Data Management Office (BCO-DMO), data currently available primarily through individuals, disparate reports and data agencies, and in multiple formats, are being collected and prepared for addition to the BCO-DMO database from which they will be freely available to the community.

As data are contributed to the BCO-DMO office, they are organized into four overlapping categories:
1. Level 1, basic metadata
(e.g., description of project/study, general location, PI(s), participants);
2. Level 2, detailed metadata and basic shipboard data and routine ship's operations
(e.g., CTDs, underway measurements, sampling event logs);
3. Level 3, detailed metadata and data from specialized observations
(e.g., discrete observations, experimental results, rate measurements) and
4. Level 4, remaining datasets
(e.g., highest level of detailed data available from each study).

Collaboration with BCO-DMO staff began in March of 2008 and initial efforts have been directed toward basic project descriptions, levels 1 and 2 metadata and basic data, with detailed and more detailed data files being incorporated as they become available and are processed.

Related file

Program Documentation

The Iron Synthesis Program is funded jointly by the Scientific Committee on Oceanic Research (SCOR) and the U.S. National Science Foundation (NSF).

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