FN Archimer Export Format
PT J
TI Characterization of the vertical size distribution, composition and chemical properties of dissolved organic matter in the (ultra)oligotrophic Pacific Ocean through a multi-detection approach
BT 
AF Fourrier, P.
   Dulaquais, Gabriel
   Guigue, C.
   Giamarchi, P.
   Sarthou, Geraldine
   Whitby, H.
   Riso, Ricardo
AS 1:1;2:1;3:2;4:3;5:1;6:4;7:1;
FF 1:;2:;3:;4:;5:;6:;7:;
C1 Laboratoire des Sciences de l'Environnement Marin CNRS UMR 6539, Institut Universitaire Européen de la Mer, Université de Bretagne Occidentale. Place Nicolas Copernic, 29280 Plouzané, France
   Aix-Marseille Univ., Université de Toulon, CNRS, IRD, MIO UM 110, Marseille, France
   Laboratoire OPTIMAG, Université de Brest, 6 Av. Victor Le Gorgeu, 29285, Brest Cedex, France
   Department of Earth, Ocean and Ecological Sciences, School of Environmental Sciences, University of Liverpool, Liverpool, UK
C2 UBO, FRANCE
   UNIV AIX MARSEILLE, FRANCE
   UBO, FRANCE
   UNIV LIVERPOOL, UK
UM LEMAR
IN WOS Cotutelle UMR
   copubli-france
   copubli-europe
   copubli-univ-france
IF 3
TC 9
UR https://archimer.ifremer.fr/doc/00741/85342/90380.pdf
LA English
DT Article
CR TONGA 2019
BO L'Atalante
DE ;Dissolved organic matter (DOM);Pacific Ocean;Humic substances (HS);Size exclusion chromatography (SEC)
AB This work presents a multi-analytical approach for the characterization of marine dissolved organic matter (DOM). The determination of marine dissolved organic carbon (DOC) was performed by size exclusion chromatography (SEC) and validated using a certified reference material (CRM) as well as through an intercomparison exercise. Multi-detection SEC, fluorescence and electrochemical methods were used in order to describe the size distribution spectra, the composition and chemical properties of marine DOM, in the (ultra)oligotrophic West Tropical South Pacific Ocean (WTSP). In this work, we defined the state of degradation of DOC in the different size fractions, operationally defined by SEC. We estimated that on average 62% of DOC was of humic nature (0.5–10 kDa), of which ~9% was able to complex trace elements, such as iron (Fe). Our results tend to support that non-refractory DOC is of high molecular weight (HMW), nitrogen (N)-rich, aliphatic, and has a weak fluorescence quantum yield and an enhanced binding capacity for Fe. The ageing of marine DOM occurring within mesopelagic waters is mainly driven by microbial respiration and alters these chemical properties. Although our results are in agreement with a paradigm describing oceanic DOM biogeochemistry known as the size-reactivity continuum, 3 μmolC L−1 of very HMW (> 10 kDa) were still observed in a water mass mainly composed of Pacific Deep Waters. This persistence could be explained by a significant content (5%) of aromatic carbon that may protect HMW DOM from long term biodegradation. 
PY 2022
PD MAR
SO Marine Chemistry
SN 0304-4203
PU Elsevier BV
VL 240
UT 000750835600003
DI 10.1016/j.marchem.2021.104068
ID 85342
ER

EF