FN Archimer Export Format PT J TI Spatial Variability of Organic Matter and Phosphorus Cycling in Rhône River Prodelta Sediments (NW Mediterranean Sea, France): a Model-Data Approach BT AF Ait Ballagh, Fatima Ezzahra Rabouille, Christophe ANDRIEUX-LOYER, Francoise Soetaert, Karline Lansard, Bruno Bombled, Bruno Monvoisin, Gael Elkalay, Khalid Khalil, Karima AS 1:1,2;2:1;3:3;4:4;5:1;6:1;7:5;8:2;9:2; FF 1:;2:;3:PDG-ODE-DYNECO-PELAGOS;4:;5:;6:;7:;8:;9:; C1 ViolaineLaboratoire des Sciences du Climat et de l’Environnement, Laboratoire Mixte CEA-CNRS-UVSQ, IPSL et Université Paris-Saclay, CEA-Orme des Merisiers, 91191, Gif sur Yvette, France Laboratory of Applied Sciences for the Environment and Sustainable Development, Essaouira School of Technology, Cadi Ayyad University, Km 9, Route d’Agadir, BP. 383, Essaouira Aljadida, Morocco Ifremer ,DYNECO PELAGOS, ZI Pointe du Diable, 29280, Plouzané, France Department of Estuarine and Delta Systems, Royal Netherlands Institute for Sea Research (NIOZ) and Utrecht University, P.O. Box 140, 4400 AC, Yerseke, The Netherlands GEOPS, Université Paris-Saclay et CNRS, Campus d’Orsay, Orsay, France C2 LSCE, FRANCE UNIV CADI AYYAD, MOROCCO IFREMER, FRANCE INST SEA RESEARCH (NIOZ), NETHERLANDS UNIV PARIS SACLAY, FRANCE SI BREST SE PDG-ODE-DYNECO-PELAGOS IN WOS Ifremer UPR copubli-france copubli-europe copubli-univ-france copubli-int-hors-europe copubli-sud IF 3.032 TC 8 UR https://archimer.ifremer.fr/doc/00683/79493/82128.pdf LA English DT Article CR MISSRHODIA2 BO Téthys II DE ;Organic matter;Phosphorus;Mediterranean Sea;Rhône River prodelta;Sediment;Modelling AB The Mediterranean Sea (MS) is a large oligotrophic sea whose productivity is sensitive to riverine nutrient inputs. More specifically, phosphorus (P) river supply is crucial for the MS, with an important role of the estuarine/deltaic filter especially for the storage and recycling in sediments. A benthic dataset from the Rhône River prodelta was used to derive P budgets, by means of an early diagenetic model including the benthic P cycle. The model was fitted to pore water profiles of oxygen, nitrate, sulfate, dissolved inorganic carbon, ammonium, oxygen demand units, dissolved inorganic phosphorus (DIP) and solid data (organic carbon (OC), Fe-bound P, Ca-bound P and organic P). Results indicated that the intensity of biogeochemical processes occurring below the sediment–water interface decreased from the river mouth to the adjacent continental shelf with decreasing integrated rates of OC mineralization (160–10 mmol m−2 day−1). The organic P mineralization was intense near the river mouth and decreased offshore (1196–80 μmol m−2 day−1). Its contribution to DIP release was large (> 90%). Fe-bound P had a key role in transferring P to deeper layers. These deltaic sediments played an important role as a source of regenerated DIP. A significant part of DIP was recycled to the overlying waters (72–94%), representing 25% of the riverine DIP discharge. Simultaneously, 6–28% of DIP produced in sediments was buried as Ca-bound P. Overall, this study highlighted the importance of deltaic sediments as an additional source of DIP to the coastal sea, and a minor but permanent sink of phosphorus as solid P burial. PY 2021 PD NOV SO Estuaries And Coasts SN 1559-2723 PU Springer VL 44 IS 7 UT 000618577800001 BP 1765 EP 1789 DI 10.1007/s12237-020-00889-9 ID 79493 ER EF