FN Archimer Export Format PT J TI Impact of an intrusion by the Northern Current on the biogeochemistry in the eastern Gulf of Lion, NW Mediterranean BT AF ROSS, Oliver N. FRAYSSE, Marion PINAZO, Christel PAIRAUD, Ivane AS 1:1;2:1,2;3:1;4:2; FF 1:;2:PDG-ODE-LITTORAL-LERPAC;3:;4:PDG-ODE-LITTORAL-LERPAC; C1 Aix Marseille Univ, Univ Toulon, CNRS, IRD,MIO UM 110, F-13288 Marseille, France. Inst Francais Rech Exploitat Mer, Lab Environm Ressources Prov Azur Corse, F-83507 La Seyne Sur Mer, France. C2 UNIV AIX MARSEILLE, FRANCE IFREMER, FRANCE SI TOULON SE PDG-ODE-LITTORAL-LERPAC IN WOS Ifremer jusqu'en 2018 copubli-france copubli-univ-france IF 2.176 TC 20 UR https://archimer.ifremer.fr/doc/00302/41359/40644.pdf LA English DT Article CR RHOMA_LEG2 SPECIMED 2012 - MVP1 SPECIMED 2012 - MVP2 SPECIMED 2012 - MVP3 BO Téthys II DE ;Northern Current;Gulf of Lion;Intrusion;Continental shelf;Biogeochemical modelling;Regime shift AB We present the results from the RHOMA2011-LEG2 campaign that took place in the eastern Gulf of Lion from 7 to 17 Oct 2011 and combine them with remote sensing observations and results from a 3D coupled hydrodynamic-biogeochemical model to study an intrusion event of the Northern Current (NC) onto the continental shelf in the Gulf of Lion (NW Mediterranean). Our analysis shows that during the intrusion, the previously upwelled nutrient-rich water present on the shelf is replaced by warmer and mostly oligotrophic NC water within a matter of 2–3 days. This has a marked impact on the local biogeochemistry in the Gulf with pre-intrusion Chl-a concentrations in the surface layer of over 0.5 mg m−3 dropping to near the detection limit within less than 72 h. The intrusion event leads to a dramatic albeit short-lived regime shift in the limiting nutrient for primary production: prior to the intrusion most of production on the shelf is nitrogen limited while the intrusion induces a shift to phosphorous limitation. The relatively high frequency of occurrence of these intrusions in combination with their impact on the local ecosystem make them primary targets for future study. PY 2016 PD MAR SO Estuarine Coastal And Shelf Science SN 0272-7714 PU Academic Press Ltd- Elsevier Science Ltd VL 170 UT 000372379900001 BP 1 EP 9 DI 10.1016/j.ecss.2015.12.022 ID 41359 ER EF