Dis-Crediting Ocean Fertilization

  title={Dis-Crediting Ocean Fertilization},
  author={Sallie W. Chisholm and Paul G. Falkowski and John J Cullen},
  pages={309 - 310}
never exhausted in surface waters, and phytoplankton biomass is less than expected. Martin (6, 7) suggested that it is the scarcity of biologically available iron in these high-nutrient, low-chlorophyll (HNLC) regions that makes it impossible for the phytoplankton to use the excess N and P. He also recognized that atmospheric dust from land is an important source of iron for the sea and that HNLC regions receive a relatively small dust flux. Furthermore, he noted that ice core records of… 
Ironing Out Algal Issues in the Southern Ocean
  • P. Boyd
  • Environmental Science
  • 2004
In his perspective, Boyd comments on three papers that report results from recent large-scale experiments in which ocean waters have been enriched with iron, test the hypothesis that enhanced iron supply leads to enhanced export of particulate organic carbon.
Effect of natural iron fertilization on carbon sequestration in the Southern Ocean
It is found that a large phytoplankton bloom over the Kerguelen plateau in the Southern Ocean was sustained by the supply of iron and major nutrients to surface waters from iron-rich deep water below, suggesting that changes in iron supply from below may have a more significant effect on atmospheric carbon dioxide concentrations than previously thought.
The decline and fate of an iron-induced subarctic phytoplankton bloom
The depletion of silicic acid and the inefficient transfer of iron-increased POC below the permanent thermocline have major implications both for the biogeochemical interpretation of times of greater iron supply in the geological past, and also for proposed geo-engineering schemes to increase oceanic carbon sequestration.
Efficiency of small scale carbon mitigation by patch iron fertilization
Abstract. While nutrient depletion scenarios have long shown that the high-latitude High Nutrient Low Chlorophyll (HNLC) regions are the most effective for sequestering atmospheric carbon dioxide,
Effects of patchy ocean fertilization on atmospheric carbon dioxide and biological production
Increasing oceanic productivity by fertilizing nutrient‐rich regions with iron has been proposed as a mechanism to offset anthropogenic emissions of carbon dioxide. Earlier studies examined the
Iron biogeochemistry in the waters surrounding the Crozet Islands, Southern Ocean
The aim of this thesis was to improve our understanding of the natural iron fertilisation processes that can alleviate the High Nutrient Low Chlorophyll conditions normally associated with the
Role of algal aggregation in vertical carbon export during SOIREE and in other low biomass environments
Additions of iron to surface regions of the ocean have induced an increase in phytoplankton biomass, but do not necessarily trigger increases in carbon export from surface waters. Using new
Globalizing results from ocean in situ iron fertilization studies
Despite the growing number of in situ iron fertilization experiments, the efficiency of such fertilization to sequester atmospheric CO2 remains largely unknown. For the first time, a global ocean


Iron deficiency limits phytoplankton growth in the north-east Pacific subarctic
An interesting oceanographic problem concerns the excess major plant nutrients (PO4, NO3, SiO3) occurring in offshore surface waters of the Antarctic1–3 and north-east Pacific subarctic Oceans4. In a
A mesoscale phytoplankton bloom in the polar Southern Ocean stimulated by iron fertilization
It is demonstrated that iron supply controls phytoplankton growth and community composition during summer in these polar Southern Ocean waters, but the fate of algal carbon remains unknown and depends on the interplay between the processes controlling export, remineralisation and timescales of water mass subduction.
Glacial/interglacial variations in atmospheric carbon dioxide
A version of the hypothesis that the whole-ocean reservoir of algal nutrients was larger during glacial times, strengthening the biological pump at low latitudes, where these nutrients are currently limiting is presented.
Testing the iron hypothesis in ecosystems of the equatorial Pacific Ocean
Findings indicate that iron limitation can control rates of phytoplankton productivity and biomass in the ocean.
Possible biogeochemical consequences of ocean fertilization
We consider biogeochemical secondary effects that could arise from an increase in ocean productivity, such as may occur via fertilization with Fe. These processes and feedback loops are infrequently
Role of the marine biosphere in the global carbon cycle
The geochemical disequilibrium of our planet is due mainly to carbon sequestration by marine organisms over geological time. Changes in atmospheric CO, during interglacial-glacial transitions require
A massive phytoplankton bloom induced by an ecosystem-scale iron fertilization experiment in the equatorial Pacific Ocean
Observations provide unequivocal support for the hypothesis that phytoplankton growth in this oceanic region is limited by iron bioavailability.
Three‐dimensional simulations of the impact of Southern Ocean nutrient depletion on atmospheric CO2 and ocean chemistry
Surface nutrient concentrations in the Southern Ocean are an important indicator of the atmosphere-ocean chemical balance that played a key role in ice-age reduction of atmospheric pC0, and would
Atmospheric Carbon Dioxide Levels Over Phanerozoic Time
  • R. Berner
  • Environmental Science, Geography
  • 1990
The model results correspond to independently deduced Phanerozoic paleoclimates and support the notion that the atmospheric CO2 greenhouse mechanism is a major control on climate over very long time scales.
Primary Productivity and Biogeochemical Cycles in the Sea
Honorary Lecture: Towards Understanding the Roles of Phytoplankton in Biogeochemical Cycles R.W. Eppley. Factors Limiting Primary Productivity in the Sea: Light: The Nature and Measurement of Light