Role of zooplankton dynamics for Southern Ocean phytoplankton biomass and global biogeochemical cycles

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Author(s) Le Quéré, C., Buitenhuis, E.T., Moriarty, R., Alvain, S., Aumont, O., Bopp, L., Chollet, S., Enright, C., Franklin, D.J., Geider, R.J., Harrison, S.P., Hirst, A., Larsen, S., Legendre, L., Platt, T., Prentice, I.C., Rivkin, R.B., Sathyendranath, S., Stephens, N., Vogt, M., Sailley, S., Vallina, S.M.
Publication Type Journal Items, Publication Status: Published
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Title Role of zooplankton dynamics for Southern Ocean phytoplankton biomass and global biogeochemical cycles
Author(s) Le Quéré, C.
Buitenhuis, E.T.
Moriarty, R.
Alvain, S.
Aumont, O.
Bopp, L.
Chollet, S.
Enright, C.
Franklin, D.J.
Geider, R.J.
Harrison, S.P.
Hirst, A.
Larsen, S.
Legendre, L.
Platt, T.
Prentice, I.C.
Rivkin, R.B.
Sathyendranath, S.
Stephens, N.
Vogt, M.
Sailley, S.
Vallina, S.M.
Journal or Series Title Biogeosciences Discussions
Volume Number 12
Issue Number 14
Start Page 11935
End Page 11985
ISSN 1810-6277
Publisher Copernicus Publ.
Publication Place Göttingen
Publication Date 2015
Abstract Global ocean biogeochemistry models currently employed in climate change projections use highly simplified representations of pelagic food webs. These food webs do not necessarily include critical pathways by which ecosystems interact with ocean biogeochemistry and climate. Here we present a global biogeochemical model which incorporates ecosystem dynamics based on the representation of ten plankton functional types (PFTs); six types of phytoplankton, three types of zooplankton, and heterotrophic bacteria. We improved the representation of zooplankton dynamics in our model through (a) the explicit inclusion of large, slow-growing zooplankton, and (b) the introduction of trophic cascades among the three zooplankton types. We use the model to quantitatively assess the relative roles of iron vs. grazing in determining phytoplankton biomass in the Southern Ocean High Nutrient Low Chlorophyll (HNLC) region during summer. When model simulations do not represent crustacean macrozooplankton grazing, they systematically overestimate Southern Ocean chlorophyll biomass during the summer, even when there was no iron deposition from dust. When model simulations included the developments of the zooplankton component, the simulation of phytoplankton biomass improved and the high chlorophyll summer bias in the Southern Ocean HNLC region largely disappeared. Our model results suggest that the observed low phytoplankton biomass in the Southern Ocean during summer is primarily explained by the dynamics of the Southern Ocean zooplankton community rather than iron limitation. This result has implications for the representation of global biogeochemical cycles in models as zooplankton faecal pellets sink rapidly and partly control the carbon export to the intermediate and deep ocean.
DOI 10.5194/bgd-12-11935-2015
Additional Notes Published online 30 July 2015
Document Type Article
Publication Status Published
Language English
Assigned Organisational Unit(s) 03731
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NEBIS System Number 010153508
Source Database ID FORM-1450361471
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  author = "Le Qu{\'{e}}r{\'{e}}, C. and Buitenhuis, E.T. and Moriarty, R. and Alvain, S. and Aumont, O. and Bopp, L. and Chollet, S. and Enright, C. and Franklin, D.J. and Geider, R.J. and Harrison, S.P. and Hirst, A. and Larsen, S. and Legendre, L. and Platt, T. and Prentice, I.C. and Rivkin, R.B. and Sathyendranath, S. and Stephens, N. and Vogt, M. and Sailley, S. and Vallina, S.M.",
  title = "{R}ole of zooplankton dynamics for {S}outhern {O}cean phytoplankton biomass and global biogeochemical cycles",
  journal = "Biogeosciences Discussions",
  year = 2015,
  volume = "12",
  number = "14",
  pages = "11935--11985",

E-Citations record created: Thu, 17 Dec 2015, 14:11:15 CET