English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Total dissolvable iron (TDFe) was measured in the water column above and in the surrounding of the Kergue- len 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 off- shore 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 ad- vection of water that had been in contact with the conti- nental 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◊10 6 and 8.3±11.6◊10 3 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 wa- ter. 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 phytoplank- ton in our study. Finally, when taking into account the lat- eral supply of dissolved iron, the seasonal carbon sequestra- tion efficiency was estimated at 154 000 mol C (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 dur- ing the other study of a natural iron fertilisation experiment, CROZEX.

An iron budget during the natural iron fertilisation experiment KEOPS (Kerguelen Islands, Southern Ocean)