FN Archimer Export Format PT J TI Modeling the Wake of the Marquesas Archipelago BT AF RAAPOTO, H. MARTINEZ, E. PETRENKO, A. DOGLIOLI, A. M. MAES, C. AS 1:1;2:1;3:2;4:1;5:3; FF 1:;2:;3:;4:;5:; C1 IFREMER, ILM, UPF, IRD,Ecosyst Insulaires Oceaniens, Tahiti, French Polynesi, France. Univ Toulon & Var, Aix Marseille Univ, CNRS, IRD,OSU PYTHEAS,Mediterranean Inst Oceanog MIO,UM, Marseille, France. Univ Brest, IFREMER, Lab Oceanog Phys & Spatiale, CNRS,IRD,IUEM, Brest, France. C2 IRD, FRANCE UNIV TOULON, FRANCE IRD, FRANCE UM LOPS IF 3.235 TC 10 UR https://archimer.ifremer.fr/doc/00428/53986/55146.pdf https://archimer.ifremer.fr/doc/00428/53986/55147.pdf https://archimer.ifremer.fr/doc/00428/53986/55148.jpg LA English DT Article DE ;Marquesas archipelago;Island wakes;fine-scale processes;eddy kinetic energy;eddy detection;Island mass effect AB In this study, a high-resolution (∼2.5 km) numerical model was set up to investigate the fine-scale activity within the region of the Marquesas archipelago. This has never been performed before. The robustness of the model results is assessed by comparison with remote sensing and in situ observations. Our results highlight regions of warm waters leeward of the different islands with high eddy kinetic energy (EKE) on their sides. The analysis of energy conversion terms reveals contributions to EKE variability by wind, baroclinic, and barotropic instabilities. The use of a geometry-based eddy detection algorithm reveals the generation of cyclonic and anticyclonic eddies in the wake of the largest islands, with both an inshore and offshore effect. Maximum eddy activity occurs in austral winter following the seasonality of both wind stress and EKE intensity. Most eddies have a radius between 20 and 30 km and are generally cyclonic rather than anticyclonic. Significant vertical velocities are observed in the proximity of the islands, associated with topographically induced flow separation. Eddy trapping inshore waters are advected offshore in the wake of the islands. The overall influence of these fine-scale dynamics could explain the strong biological enhancement of the archipelago. PY 2018 PD FEB SO Journal Of Geophysical Research-oceans SN 2169-9275 PU Amer Geophysical Union VL 123 IS 2 UT 000427970400029 BP 1213 EP 1228 DI 10.1002/2017JC013285 ID 53986 ER EF