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Robotic Observations of Enhanced Carbon Biomass and Export at 55°S During SOFeX
James K. B. Bishop,1*Todd J. Wood,1Russ E. Davis,2Jeffrey T. Sherman2
Autonomous floats profiling in high-nitrate low-silicate watersof the Southern Ocean observed carbon biomass variability andcarbon exported to depths of 100 m during the 2002 SouthernOcean Iron Experiment (SOFeX) to detect the effects of ironfertilization of surface water there. Control and "in-patch"measurements documented a greater than fourfold enhancementof carbon biomass in the iron-amended waters. Carbon exportthrough 100 m increased two- to sixfold as the patch subductedbelow a front. The molar ratio of iron added to carbon exportedranged between 104 and 105. The biomass buildup and export weremuch higher than expected for iron-amended low-silicate waters.
1 Earth Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, MS 90-1116, Berkeley, CA 94720, USA. 2 Scripps Institution of Oceanography, La Jolla, CA 92093–0230, USA.
* To whom correspondence should be addressed. E-mail: JKBishop{at}lbl.gov
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