FN Archimer Export Format
PT J
TI Dissolved iron patterns impacted by shallow hydrothermal sources along a transect through the Tonga‐Kermadec arc
BT 
AF Tilliette, C.
   Taillandier, V.
   Bouruet‐Aubertot, P.
   Grima, Nicolas
   Maes, Christophe
   Montanes, M.
   Sarthou, Geraldine
   Vorrath, M‐E.
   Arnone, V.
   Bressac, M.
   González‐Santana, D.
   Gazeau, F.
   Guieu, C.
AS 1:1;2:1;3:2;4:3;5:7;6:1;7:4;8:5;9:6;10:1;11:4;12:1;13:1;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;12:;13:;
C1 Sorbonne Université CNRS Laboratoire d’Océanographie de Villefranche LOV 06230 Villefranche‐sur‐Mer, France
   Sorbonne Université CNRS IRD Laboratoire d'Océanographie et de Climatologie par Expérimentation et Approche Numérique (LOCEAN) Paris ,France
   Univ Brest CNRS IRD Ifremer Laboratoire d’Océanographie Physique et Spatiale (LOPS UMR 6523) IUEM Brest ,France
   Univ Brest CNRS IRD Ifremer LEMAR F‐29280 Plouzane , France
   Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research 27568 Bremerhaven, Germany
   Instituto de Oceanografía y Cambio Global IOCAG Universidad de Las Palmas de Gran Canaria ULPGC 35017 Las Palmas de Gran Canaria ,Spain
   Univ Brest CNRS IRD Ifremer LEMAR F‐29280 Plouzane , France
C2 UNIV SORBONNE, FRANCE
   UNIV SORBONNE, FRANCE
   CNRS, FRANCE
   CNRS, FRANCE
   INST A WEGENER, GERMANY
   UNIV LAS PALMAS GRAN CANARIA, SPAIN
   IRD, FRANCE
UM LOPS
   LEMAR
IN WOS Cotutelle UMR
   copubli-france
   copubli-europe
   copubli-univ-france
IF 5.2
TC 11
UR https://archimer.ifremer.fr/doc/00782/89400/94882.pdf
   https://archimer.ifremer.fr/doc/00782/89400/94883.docx
LA English
DT Article
CR TONGA 2019
BO L'Atalante
DE ;dissolved iron;eOMP;hydrothermal sources;western tropical south pacific;biogeochemical processes;iron cycle
AB 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) 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, 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. 
PY 2022
PD JUN
SO Global Biogeochemical Cycles
SN 0886-6236
PU American Geophysical Union (AGU)
VL 36
IS 7
UT 000823305800001
DI 10.1029/2022GB007363
ID 89400
ER

EF