Cited by 889Marine and coastal ecosystemsOceanographic and Atmospheric ProcessesAquatic Ecosystems and Phytoplankton Dynamics

Upper ocean ecosystem dynamics and iron cycling in a global three-dimensional model

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Moore, J. Keith, Doney, Scott C., Lindsay, Keith·2004·Global Biogeochemical Cycles

Abstract

A global three‐dimensional marine ecosystem model with several key phytoplankton functional groups, multiple limiting nutrients, explicit iron cycling, and a mineral ballast/organic matter parameterization is run within a global ocean circulation model. The coupled biogeochemistry/ecosystem/circulation (BEC) model reproduces known basin‐scale patterns of primary and export production, biogenic silica production, calcification, chlorophyll, macronutrient and dissolved iron concentrations. The model captures observed high nitrate, low chlorophyll (HNLC) conditions in the Southern Ocean, subarctic and equatorial Pacific. Spatial distributions of nitrogen fixation are in general agreement with field data, with total N‐fixation of 55 Tg N. Diazotrophs directly account for a small fraction of primary production (0.5%) but indirectly support 10% of primary production and 8% of sinking particulate organic carbon (POC) export. Diatoms disproportionately contribute to export of POC out of surface waters, but CaCO 3 from the coccolithophores is the key driver of POC flux to the deep ocean in the model. An iron source from shallow ocean sediments is found critical in preventing iron limitation in shelf regions, most notably in the Arctic Ocean, but has a relatively localized impact. In contrast, global‐scale primary production, export production, and nitrogen fixation are all sensitive to variations in atmospheric mineral dust inputs. The residence time for dissolved iron in the upper ocean is estimated to be a few years to a decade. Most of the iron utilized by phytoplankton is from subsurface sources supplied by mixing, entrainment, and ocean circulation. However, owing to the short residence time of iron in the upper ocean, this subsurface iron pool is critically dependent on continual replenishment from atmospheric dust deposition and, to a lesser extent, lateral transport from shelf regions.

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Crossref · 10.1029/2004gb002220

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Research works printed but not linked: 6

  1. de Baar H. J. W., 2001, The Biogeochemistry of Iron in Seawater, 123
  2. 10.1175/1520-0442(1998)011<1287:TNCSMG>2.0.CO;2 · DOI
  3. Jickells T., 2001, The Biogeochemistry of Iron in Seawater, 85
  4. O'Neil J. M., 1999, Grazer interactions with nitrogen‐fixing marine cyanobacteria: Adaptation for N‐acquisition?, Bull. Inst. Oceanogr., 19, 293
  5. O'Neil J. M., 2004, Nutrient dynamics and plankton community changes associated with a bloom of the pelagic cyanobacterium Trichodesmium, J. Plankton Res.
  6. 10.1029/2009JD002775 · DOI

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Authors
Moore, J. K., Doney, S. C., & Lindsay, K.
Affiliations
  • University of California, Irvine (US)
  • Woods Hole Oceanographic Institution (US)
  • NSF National Center for Atmospheric Research (US)
Venue
Global Biogeochemical Cycles
Published
2004-12
Volume
18
Issue
4
ISSN
  • 0886-6236 (ISSN-L)
  • 1944-9224
OpenAlex
W2148343249
Cited by
889
References
108
Citations by year
2026: 23 · 2025: 27 · 2024: 40 · 2023: 51 · 2022: 66 · 2021: 67 · 2020: 43 · 2019: 35 · 2018: 43 · 2017: 40 · 2016: 43 · 2015: 51 · 2014: 36 · 2013: 55 · 2012: 46
FWCI
18.32
Type
journal article
Language
en
Open access
Locations
  • Global Biogeochemical Cycles (publishedVersion)
  • Open Access Server of the Woods Hole Scientific Community (Woods Hole Scientific Community) (submittedVersion)
  • eScholarship (California Digital Library) (submittedVersion, cc-by)
Funders
  • National Science Foundation
  • National Center for Atmospheric Research
  • Woods Hole Oceanographic Institution
  • Goddard Space Flight Center
Topics
  • Physical Sciences › Earth and Planetary Sciences › Oceanography › Marine and coastal ecosystems
  • Physical Sciences › Earth and Planetary Sciences › Oceanography › Oceanographic and Atmospheric Processes
  • Physical Sciences › Environmental Science › Environmental Chemistry › Aquatic Ecosystems and Phytoplankton Dynamics
Keywords
iron cycling, phytoplankton functional groups, nitrogen fixation, nitrogen-fixing bacteria, particulate organic carbon export, biogenic silica, coccolithophores, calcification, iron limitation, continental shelf sediments, Southern Ocean, Arctic Ocean, primary production

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