Effects of patchy ocean fertilization on atmospheric carbon dioxide and biological production

  title={Effects of patchy ocean fertilization on atmospheric carbon dioxide and biological production},
  author={Anand Gnanadesikan and Jorge L. Sarmiento and Richard Slater},
  journal={Global Biogeochemical Cycles},
[1] 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 impact of large-scale fertilization of vast reaches of the ocean for long periods of time. We use an ocean general circulation model to consider more realistic scenarios involving fertilizing small regions (a few hundred kilometers on a side) for limited periods of time (of order 1 month). A century… Expand
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. Expand
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,Expand
Model simulations of carbon sequestration in the northwest Pacific by patch fertilization
Iron fertilization of nutrient-rich surface waters of the ocean is one possible way to help slow the rising levels of atmospheric CO2 by sequestering it in the oceans via biological carbon export.Expand
Impact of atmospheric and terrestrial CO2 feedbacks on fertilization-induced marine carbon uptake
The sensitivity of oceanic CO2 uptake to alterations in the marine biological carbon pump, such as brought about by natural or purposeful ocean fertilization, has repeatedly been investigated byExpand
Side effects and accounting aspects of hypothetical large-scale Southern Ocean iron fertilization
Abstract. Recent suggestions to slow down the increase in atmospheric carbon dioxide have included ocean fertilization by addition of the micronutrient iron to Southern Ocean surface waters, where aExpand
The impact on atmospheric CO 2 of iron fertilization induced changes in the ocean's biological pump
Abstract. Using numerical simulations, we quantify the impact of changes in the ocean's biological pump on the air-sea balance of CO2 by fertilizing a small surface patch in the high-nutrient,Expand
Climate change, ocean processes and ocean iron fertilization
Increased remineralization associated with the increased downward export of organic carbon particles would result in increased production of the third most important long-lived greenhouse gas, N2O, the magnitude of this effect is poorly known. Expand
Ocean Fertilization for Sequestration of Carbon Dioxide from the Atmosphere
The ocean is a major sink for both preindustrial and anthropogenic carbon dioxide. Both physically and biogeochemically driven pumps, termed the solubility and biological pump, respectively Fig.5.1)Expand
Controls on ocean productivity and air-sea carbon flux: An adjoint model sensitivity study
[1] We use the adjoint of a global model of coupled oceanic cycles of carbon, phosphorus and iron to comprehensively and efficiently map the sensitivity of global biological productivity and air-seaExpand
DOE Ocean Carbon Sequestration Research Workshop 2005
  • 2007
s (All abstracts included even those who did not attend) Kevin R. Arrigo Department of Geophysics, Stanford University Iron fertilization of the Southern Ocean: Regional Simulation and Analysis ofExpand


Enhanced carbon dioxide uptake by the world's oceans
Abstract The growth of phytoplankton over much of the ocean is limited by the availability of nitrogen in the upper sunlit region of the ocean. It is through photosynthesis that upper ocean carbon isExpand
Oceanic sinks for atmospheric CO2
There is approximately 50 times more inorganic carbon in the global ocean than in the atmosphere. On time scales of decades to millions of years, the interaction between these two geophysical fluidsExpand
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. Expand
Potential of marine macroalgae as a sink for CO2: Constraints from a 3-D general circulation model of the global ocean
A 3-D global ocean model used previously to determine natural oceanic uptake of anthropogenic CO2 is used here to evaluate another proposed strategy for mitigation of rising atmospheric CO2. As aExpand
A new, mechanistic model for organic carbon fluxes in the ocean based on the quantitative association of POC with ballast minerals
Abstract In simulation studies of the ocean's role in the global carbon cycle, predicting the depth-distribution for remineralization of particulate organic carbon (POC) is of particular importance.Expand
Atmospheric iron supply and enhanced vertical carbon flux in the NE subarctic Pacific: Is there a connection?
Recent studies have confirmed the relationship between iron supply and phytoplankton growth rates in all three high-nitrate low-chlorophyll (HNLC) oceanic provinces. However, there is littleExpand
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 wouldExpand
Particle transformations and export flux during an in situ iron-stimulated algal bloom in the Southern Ocean
During the first Southern Ocean Iron RElease Experiment (SOIREE), a suite of biogeochemical measurements (water column 234Th and δ13Corg inventories, particle fluxes from sediment traps,Expand
Iron-limited diatom growth and Si:N uptake ratios in a coastal upwelling regime
There is compelling evidence that phytoplankton growth is limited by iron availability in the subarctic Pacific, and equatorial Pacific and Southern oceans. A lack of iron prevents the completeExpand
Dis-Crediting Ocean Fertilization
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,Expand