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An iron budget during the natural iron fertilisation experiment KEOPS (Kerguelen Islands, Southern Ocean)
Citation
Chever, F and Sarthou, G and Bucciarelli, E and Blain, S and Bowie, AR, An iron budget during the natural iron fertilisation experiment KEOPS (Kerguelen Islands, Southern Ocean), Biogeosciences, 7, (2) pp. 455-468. ISSN 1726-4170 (2010) [Refereed Article]
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Copyright Statement
© Author(s) 2010. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Official URL: http://www.agu.org/
DOI: doi:10.5194/bg-7-455-2010
Abstract
Total dissolvable iron (TDFe) was measured in the
water column above and in the surrounding of the Kerguelen
Plateau (Indian sector of the Southern Ocean) during the
KErguelen Ocean Plateau compared Study (KEOPS) cruise.
TDFe concentrations ranged from 0.90 to 65.6 nmol L−1
above the plateau and from 0.34 to 2.23 nmol L−1 offshore
of the plateau. Station C1 located south of the
plateau, near Heard Island, exhibited very high values (329–
770 nmol L−1). Apparent particulate iron (Feapp), calculated
as the difference between the TDFe and the dissolved iron
measured on board (DFe) represented 95±5% of the TDFe
above the plateau, suggesting that particles and refractory
colloids largely dominated the iron pool. This paper presents
a budget of DFe and Feapp above the plateau. Lateral advection
of water that had been in contact with the continental
shelf of Heard Island seems to be the predominant
source of Feapp and DFe above the plateau, with a supply of
9.7±3.6×106 and 8.3±11.6×103 mol d−1, respectively. The
residence times of 1.7 and 48 days estimated for Feapp and
DFe respectively, indicate a rapid turnover in the surface water.
A comparison between Feapp and total particulate iron
(TPFe) suggests that the total dissolved fraction is mainly
constituted of small refractory colloids. This fraction does
not seem to be a potential source of iron to the phytoplankton
in our study. Finally, when taking into account the lateral
supply of dissolved iron, the seasonal carbon sequestration
efficiency was estimated at 154 000 molC (mol Fe)−1,
which is 4-fold lower than the previously estimated value in
this area but still 18-fold higher than the one estimated during
the other study of a natural iron fertilisation experiment,
CROZEX.
Item Details
| Item Type: | Refereed Article |
|---|---|
| Research Division: | Earth Sciences |
| Research Group: | Oceanography |
| Research Field: | Chemical Oceanography |
| Objective Division: | Environment |
| Objective Group: | Physical and Chemical Conditions of Water |
| Objective Field: | Physical and Chemical Conditions of Water in Marine Environments |
| UTAS Author: | Bowie, AR (Associate Professor Andrew Bowie) |
| ID Code: | 67538 |
| Year Published: | 2010 |
| Web of Science® Times Cited: | 45 |
| Deposited By: | CRC-Antarctic Climate & Ecosystems |
| Deposited On: | 2011-03-04 |
| Last Modified: | 2011-10-06 |
| Downloads: | 313 View Download Statistics |
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