Long-Term In Situ Survey of Reactive Iron Concentrations at the EMSO-Azores Observatory

Type Article
Date 2016-10
Language English
Other localization http://ieeexplore.ieee.org/document/7480753/
Author(s) Laes-Huon AgatheORCID1, Cathalot CecileORCID1, Legrand Julien1, Tanguy Virginie2, Sarradin Pierre-MarieORCID1
Affiliation(s) 1 : IFREMER, Ctr Brest, Inst Carnot Edrome, Dept Ressources Phys & Ecosyst Fond Mer, F-29280 Plouzane, France.
Source Ieee Journal Of Oceanic Engineering (0364-9059) (Ieee-inst Electrical Electronics Engineers Inc), 2016-10 , Vol. 41 , N. 4 , P. 744-752
DOI 10.1109/JOE.2016.2552779
WOS© Times Cited 4
Keyword(s) Deep-sea observatory, hydrothermal vent, in situ chemical analyzer, iron, Monitoring the Mid-Atlantic Ridge (MoMAR)
Abstract A study of the temporal dynamics of iron concentrations and temperature on a faunal assemblage at the Lucky Strike vent was performed using the Tempo ecological module at the EMSO-Azores deep-sea observatory. The CHEMINI in situ analyzer was implemented on this structure to determine reactive iron concentrations in unfiltered seawater samples along with a temperature probe. Stability tests were performed on the CHEMINI analyzer before deployment (optical module, hyperbaric tests, and deep-sea calibration) for long-term in situ analysis of reactive iron (six months, 2013–2014) at the Tour Eiffel active edifice. Recorded daily, the in situ standard (25 \mu mol.L {}^{-1} ) showed excellent reproducibility (1.07%, n=522 ), confirming satisfactory analytical performance of the CHEMINI analyzer and thus validating the iron concentrations measured by the instrument. Furthermore, the analyzer proved to be reliable and robust over time. The averaged reactive iron concentration for the six-month period remained low ([Fe] =text{7.12}\pm text{2.11} \mu mol.L {}^{-1} , n=519 ), but showed some noticeable variations with temperature. Reactive iron concentrations and temperature were significantly correlated emphasizing reactive iron stabilization over the time of deployment. Period spectra indicated strong tidal influence and relevant frequencies of four to five days for both variables.
Full Text
File Pages Size Access
9 1 MB Access on demand
Author's final draft 10 447 KB Open access
Top of the page