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Biogeochemical cycling of dissolved zinc along the GEOTRACES South Atlantic transect GA10 at 40°S

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Wyatt, N. J., Milne, A., Woodward, E. M. S., Rees, A. P., Browning, T. J., Bouman, H. A., Worsfold, P. J., Lohan, M. C.·2014·Global Biogeochemical Cycles

DOI 10.1002/2013gb004637

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Abstract

The biogeochemical cycle of zinc (Zn) in the South Atlantic, at 40°S, was investigated as part of the UK GEOTRACES program. To date there is little understanding of the supply of Zn, an essential requirement for phytoplankton growth, to this highly productive region. Vertical Zn profiles displayed nutrient‐like distributions with distinct gradients associated with the water masses present. Surface Zn concentrations are among the lowest reported for the world's oceans (< 50 pM). A strong Zn‐Si linear relationship was observed (Zn (nM) = 0.065 Si (μM), r2 = 0.97, n = 460). Our results suggest that the use of a global Zn‐Si relationship would lead to an underestimation of dissolved Zn in deeper waters of the South Atlantic. By utilizing Si* and a new tracer Zn* our data indicate that the preferential removal of Zn in the Southern Ocean prevented a direct return path for dissolved Zn to the surface waters of the South Atlantic at 40°S and potentially the thermocline waters of the South Atlantic subtropical gyre. The importance of Zn for phytoplankton growth was evaluated using the Zn‐soluble reactive phosphorus (SRP) relationship. We hypothesize that the low Zn concentrations in the South Atlantic may select for phytoplankton cells with a lower Zn requirement. In addition, a much deeper kink at ~ 500m in the Zn:SRP ratio was observed compared to other oceanic regions.

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Authors: Wyatt, N. J., Milne, A., Woodward, E. M. S., Rees, A. P., Browning, T. J., Bouman, H. A., Worsfold, P. J., & Lohan, M. C.
Affiliations: Plymouth Marine Laboratory (GB)
University of Plymouth (GB)
University of Oxford (GB)
ORCID: Wyatt, N. J.
Milne, A.
Rees, A. P.
Browning, T. J.
Bouman, H. A.
Worsfold, P. J.
Lohan, M. C.
Venue: Global Biogeochemical Cycles
Publisher: American Geophysical Union (AGU)
Published: 2014-01
Volume: 28
Issue: 1
Pages: 44-56
ISSN: 0886-6236 (ISSN-L)
1944-9224
DOI: 10.1002/2013gb004637
OpenAlex: W1790136460
Cited by: 100
References: 64
Citations by year: 2026: 1 · 2025: 6 · 2024: 8 · 2023: 6 · 2022: 7 · 2021: 10 · 2020: 11 · 2019: 6 · 2018: 12 · 2017: 7 · 2016: 7 · 2015: 8 · 2014: 11
FWCI: 7.93
Type: journal article
Language: en
Open access: green
pearl.plymouth.ac.uk
Licence: onlinelibrary.wiley.com/termsAndConditions#vor (vor, 26 d)
Locations: Global Biogeochemical Cycles (publishedVersion)
Marine Biological Association (acceptedVersion)
PEARL (University of Plymouth) (submittedVersion)
ePrints Soton (University of Southampton) (submittedVersion)
Funders: Natural Environment Research Council (NE/H004289/1, NE/H004475/1, NE/G52388X/1)
Topics: Physical Sciences › Earth and Planetary Sciences › Oceanography › Marine Plankton and Biogeochemistry
Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Micronutrient Interactions and Effects
Physical Sciences › Environmental Science › Environmental Chemistry › Aquatic Ecosystems and Phytoplankton Dynamics
Keywords: dissolved zinc, Southern Ocean, South Atlantic, thermocline, water masses, GEOTRACES

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Biogeochemical cycling of dissolved zinc along the GEOTRACES South Atlantic transect GA10 at 40°S

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