FN Archimer Export Format
PT J
TI Seasonal and interannual variability of the pelagic ecosystem and of the organic carbon budget in the Rhodes Gyre (Eastern Mediterranean): influence of winter mixing
BT 
AF Habib, Joelle
   Ulses, Caroline
   Estournel, Claude
   Fakhri, Milad
   Marsaleix, Patrick
   Pujo-Pay, Mireille
   Conan, Pascal
   Fourrier, Marine
   Coppola, Laurent
   Mignot, Alexandre
   Mortier, Laurent
AS 1:1,2;2:1;3:1;4:2;5:1;6:3;7:3;8:4;9:4,5;10:6;11:7;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;
C1 Laboratoire d’Etudes en Géophysique et Océanographie Spatiales (LEGOS), Université de Toulouse, CNES/CNRS/IRD/UT3, Toulouse, France
   National Center for Marine Sciences, National Council for Scientific Research (CNRS-L), Jounieh, Lebanon
   Sorbonne Université, CNRS, UMR7621, Laboratoire d’Océanographie Microbienne (LOMIC), Paris, France
   Laboratoire d’Océanographie de Villefranche, CNRS, Sorbonne Université, Villefranche-sur-Mer, France
   Sorbonne Université, CNRS, OSU STAMAR, UAR2017, 4 Place Jussieu, 75252 Paris cedex 05, France
   Mercator Océan International, Toulouse, France
   Sorbonne Université, UPMC Univ Paris 06 CNRS-IRD-MNHN, Laboratoire d’Océanographie et du Climat: Expérimentations et Approches Numériques (LOCEAN), 4 place Jussieu, 75005 Paris, France
C2 UNIV TOULOUSE, FRANCE
   CNRS, LEBANON
   UNIV SORBONNE, FRANCE
   UNIV SORBONNE, FRANCE
   UNIV SORBONNE, FRANCE
   MERCATOR OCEAN, FRANCE
   UNIV SORBONNE, FRANCE
IN DOAJ
IF 4.9
TC 0
UR https://archimer.ifremer.fr/doc/00806/91825/97786.pdf
   https://archimer.ifremer.fr/doc/00806/91825/104213.pdf
   https://archimer.ifremer.fr/doc/00806/91825/104214.pdf
   https://archimer.ifremer.fr/doc/00806/91825/104215.pdf
LA English
DT Article
CR PERLE2
BO Pourquoi pas ?
AB The Rhodes Gyre is a cyclonic persistent feature of the general circulation of the Levantine Basin in the eastern Mediterranean Sea. Although it is located in the most oligotrophic basin of the Mediterranean Sea, it is a relatively high primary production area due to strong winter nutrient supply associated with the formation of Levantine Intermediate Water. In this study, a 3D coupled hydrodynamic-biogeochemical model (SYMPHONIE/Eco3M-S) was used to characterize the seasonal and interannual variability of the Rhodes Gyre’s ecosystem and to estimate an annual organic carbon budget over the 2013–2020 period. Comparisons of model outputs with satellite data and compiled in situ data from cruises and BioGeoChemical-Argo floats revealed the ability of the model to reconstruct the main seasonal and spatial biogeochemical dynamics of the Levantine Basin. The model results indicated that during the winter mixing period, phytoplankton first progressively grow sustained by nutrient supply. Then, short episodes of convection driven by heat loss and wind events, favoring nutrient injections, organic carbon export, and inducing light limitation on primary production, alternate with short episodes of phytoplankton growth. The estimate of the annual organic carbon budget indicated that the Rhodes Gyre is an autotrophic area with a positive net community production in the upper layer (0–150 m) amounting to 31.2 ± 6.9 g C m-2 year-1. Net community production in the upper layer is almost balanced over the seven-year period by physical transfers, (1) via downward export (16.8 ± 6.2 g C m-2 year-1) and (2) through lateral transport towards the surrounding regions (14.1 ± 2.1 g C m-2 year-1). The intermediate layer (150–400 m) also appears to be a source of organic carbon for the surrounding Levantine Sea (7.5 ± 2.8 g C m-2 year-1) mostly through the subduction of Levantine Intermediate Water following winter mixing. The Rhodes Gyre shows high interannual variability with enhanced primary production, net community production, and exports during years marked by intense heat losses and deep mixed layers. However, annual primary production appears to be only partially driven by winter vertical mixing. Based on our results, we can speculate that future increase of temperature and stratification could strongly impact the carbon fluxes in this region. 
PY 2023
PD AUG
SO Biogeosciences
SN 1726-4170
PU Copernicus GmbH
VL 20
IS 15
UT 001042849000001
BP 3203
EP 3228
DI 10.5194/bg-20-3203-2023
ID 91825
ER

EF