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Ecological and Biogeochemical Response of Antarctic Ecosystems to Iron Fertilization and Implications on Global Carbon Cycle

  • Bathmann, Ulrich (Alfred Wegener Institute for Polar and Marine Research (AWI))
  • 발행 : 2005.06.30

초록

The European Iron Fertilization Experiment EIFEX studied the growth and decline of a phytoplankton bloom stimulated by fertilising $10km^2$ in the core of a mesoscale $(80{\times}120km)$ cyclonic eddy south of the Antarctic Polar Front with about 2 times 7 tonnes of iron sulphate. The phytoplankton accumulation induced by iron fertilization did not exceed $3{\mu}g\;chl\;a\;l^{-1}$ despite a draw down of $5{\mu}M$ of nitrate that should have resulted in at least double to triple the amount of phytoplankton biomass assuming regular Redfield-ratios for draw down after phytoplankton growth in the Southern Ocean. During EIFEX the fertilized core of the mesoscale eddy evolved to a hotspot for a variety of small and medium sized mesozooplankton copepods. In contrast to copepods, the biomass of salps (Salpa thompson)) that dominated zooplankton biomass before the onset of our experiment decreased to nearly extinction. Most of the species of the rnosozooplankton community showed extremely hiか feeding rates compared to literature values from Southern Ocean summer communities. At the end of the experiment, massive phytoplankton sedimentation reached the sea floor at about 3800m water depth.

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참고문헌

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피인용 문헌

  1. Gut content analyses of three dominant Antarctic copepod species during an induced phytoplankton bloom EIFEX (European iron fertilization experiment) vol.30, pp.3, 2009, https://doi.org/10.1111/j.1439-0485.2009.00284.x
  2. The SOLAS air–sea gas exchange experiment (SAGE) 2004 vol.58, pp.6, 2011, https://doi.org/10.1016/j.dsr2.2010.10.015
  3. Kohlenstoffpumpen im Ozean steuern das Klima. Globale Erwärmung vol.40, pp.5, 2010, https://doi.org/10.1002/biuz.201010429
  4. Gefährdung der „Food Security“ durch die Auswirkungen des Klimawandels vol.6, pp.2, 2011, https://doi.org/10.1007/s00003-011-0685-4