High Biomass Low Export Regimes in the Southern Ocean Page: 8 of 75
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Experiment (SOFeX) in January/February 2002. Like other mesoscale iron fertilization
experiments, SOFeX involved the addition of iron to iron-limited waters with high levels of
nitrate and phosphate. Its uniqueness was to test the differential response to iron in low versus
high silicic acid waters (Coale et al. 2004). Two mesoscale iron addition experiments were
conducted in the Southern Ocean southeast of New Zealand: in the low silicic acid (<3 M), but
high nitrate (20 M) and phosphate (1.5 M) Subantarctic waters north of the Antarctic Polar
Front (APF) around 55 S, 172 W, and in the high silicic acid (~60 M), nitrate (30 M), and
phosphate (2 M) Antarctic waters south of the APF around 66 S, 172 W (Coale et al. 2004).
We sampled "control" and "iron amended" waters at both locations.
Primary productivity prior to iron fertilization was ~15 mmol C/m2/d and -32 mmol/m2/d
at 550S and 66 S, respectively (Coale et al. 2004). Opal-producing diatoms overwhelmingly
dominated primary production in the high Si region ("66 S"). The low Si region ("55OS") had
enough silicic acid to support some diatom growth, but also supported a more diverse
assemblage, including dinoflagellates and carbonate-producing coccolithophores. These
contrasting settings not only provided an interesting comparison for the biological response to
iron, but also provided an ideal setting to examine the role of ballasting for shaping vertical POC
profiles.
3.2 Sample Collection
The MULVFS collects up to 12 size-fractionated samples simultaneously between the
surface and 1000 m during the filtration of up to 12,000 L of seawater over a four hour period
(Bishop et al. 1985). MULVFS samples preserve the morphology of fragile aggregates, and the
process of filtration does not induce particle aggregation (Bishop 1988; Bishop et al. 1977).
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Lam, Phoebe J. & Bishop, James K.B. High Biomass Low Export Regimes in the Southern Ocean, article, January 27, 2006; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc880389/m1/8/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.