Please use this identifier to cite or link to this item: http://hdl.handle.net/10553/117857
Title: Dissolved Iron Patterns Impacted by Shallow Hydrothermal Sources Along a Transect Through the Tonga-Kermadec Arc
Authors: Tilliette, C.
Taillandier, V.
Bouruet-Aubertot, P.
Grima, N.
Maes, C.
Montanes, M.
Sarthou, G.
Vorrath, M. E.
Arnone, Veronica 
Bressac, M.
González Santana, David 
Gazeau, F.
Guieu, C.
UNESCO Clasification: 251002 Oceanografía química
Keywords: Biogeochemical Processes
Dissolved Iron
Eomp
Hydrothermal Sources
Iron Cycle, et al
Issue Date: 2022
Journal: Global Biogeochemical Cycles 
Abstract: In the Western Tropical South Pacific, a hotspot of dinitrogen-fixing organisms has been identified. The survival of these species depends on the availability of dissolved iron (DFe); however, the source of this DFe is still unclear. DFe was measured along a transect from 175°E to 166°W near 19–21°S. The distribution of DFe showed high spatial variability: low concentrations (∼0.2 nmol kg−1) in the South Pacific gyre and high concentrations (up to 50 nmol kg−1) in the west of the Tonga arc, indicating that this arc is a clear boundary between iron-poor and iron-rich waters. An optimal multiparameter analysis was used to distinguish the relative importance of physical transport relative to non-conservative processes on the observed distribution. This analysis demonstrated that the shallow hydrothermal sources present along the Tonga-Kermadec arc are responsible for the high concentrations observed in the photic layer. Nevertheless, in contrast to what has been observed for deep hydrothermal plumes, our results highlighted the rapid decrease in DFe concentrations near shallow hydrothermal sources. This is likely due to a shorter residence time of surface water masses combined with several biogeochemical processes at play (precipitation, scavenging, biological uptake, and photoreduction). This study clearly highlights the role of shallow hydrothermal sources on the DFe cycle within the Tonga-Kermadec arc where a strong link to biological activity in surface waters can be assessed, despite the small but significant fraction of DFe ultimately stabilized. It also emphasizes the need to consider the impact of these sources for a better understanding of the global iron cycle.
URI: http://hdl.handle.net/10553/117857
ISSN: 0886-6236
DOI: 10.1029/2022GB007363
Source: Global Biogeochemical Cycles [ISSN 0886-6236], v. 36 (7), e2022GB007363, (Julio 2022)
Appears in Collections:Artículos
Adobe PDF (3,96 MB)
Show full item record

SCOPUSTM   
Citations

15
checked on Nov 24, 2024

WEB OF SCIENCETM
Citations

15
checked on Nov 24, 2024

Page view(s)

42
checked on Feb 17, 2024

Download(s)

23
checked on Feb 17, 2024

Google ScholarTM

Check

Altmetric


Share



Export metadata



Items in accedaCRIS are protected by copyright, with all rights reserved, unless otherwise indicated.