Physical oceanography during TANGAROA cruise SOIREE

The Southern Ocean Iron RElease Experiment (SOIREE) was the first in situ iron fertilisation 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 μg l−1) and production rates (up to 1.3 g C m−2 d−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. Instruments used: Sea-Bird SBE 911Plus CTD, and; Sea-Tech 25 beamlength 660 nm Transmissometer.
 
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Mark Gall (NIWA) - Matt Walkington (NIWA). .
 

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Date ( Creation )
2014-01-17T00:30:00
Date ( Revision )
2014-01-17T00:30:00
Purpose
The Joint Global Ocean Flux Study (JGOFS) was an international and multi-disciplinary programme with participants from more than 20 nations. JGOFS was launched in 1987 at a planning meeting in Paris under the auspices of the Scientific Committee of Oceanic Research (SCOR), a committee of the International Council for Science (ICSU). Two years later, JGOFS became one of the first core projects of the International Geosphere-Biosphere Programme (IGBP). In the fall of 1988, long-term ocean time-series projects were established at sites near Bermuda and Hawaii, and the following year, the multinational North Atlantic Bloom Experiment (NABE) set up the standard for future process studies in other oceans. 
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Gall, Mark P; Walkington, Matt (2013): Physical oceanography during TANGAROA cruise SOIREE. doi:10.1594/PANGAEA.807840 
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Completed  

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  • Oceans
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S
E
W


TimePeriod
1999-01-11T19:03:001999-01-20T23:20:00 
  • southern ocean, iron fertilisation, CTD
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Unclassified  
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English  
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cc6a0110-2f85-ee42-ebb3-564f2d915c88

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English  
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Date info ( Creation )
2014-02-21T16:12:01
Title
ISO 19115-3 
 
 

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