Southern ocean iron enrichment experiment: Carbon cycling in high- and low-Si waters

Publication Type  Journal Article
Year of Publication  2004
Authors  Coale, K. H.; Johnson, K. S.; Chavez, F. P.; Buesseler, K. O.; Barber, R. T.; Brzezinski, M. A.; Cochlan, W. P.; Millero, F. J.; Falkowski, P. G.; Bauer, J. E.; Wanninkhof, R. H.; Kudela, R. M.; Altabet, M. A.; Hales, B. E.; Takahashi, T.; Lance, V. P.
Journal Title  Science
Volume  304
Issue  5669
Pages  408-414
Journal Date  Apr 16
ISBN Number  0036-8075
Accession Number  ISI:000220845400039
Key Words  equatorial pacific-ocean; last glacial maximum; polar frontal zone; ross sea; phytoplankton growth; primary productivity; biological response; silica production; fertilization; bloom

The availability of iron is known to exert a controlling influence on biological productivity in surface waters over large areas of the ocean and may have been an important factor in the variation of the concentration of atmospheric carbon dioxide over glacial cycles. The effect of iron in the Southern Ocean is particularly important because of its large area and abundant nitrate, yet iron-enhanced growth of phytoplankton may be differentially expressed between waters with high silicic acid in the south and low silicic acid in the north, where diatom growth may be limited by both silicic acid and iron. Twomesoscaleexperiments, designed to investigate the effects of iron enrichment in regions with high and low concentrations of silicic acid, were performed in the Southern Ocean. These experiments demonstrate iron's pivotal role in controlling carbon uptake and regulating atmospheric partial pressure of carbon dioxide.


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