FN Archimer Export Format PT J TI Evidence of strong inertia-gravity wave activity during the POMME experiment BT AF BOURUET-AUBERTOT, Pascale MERCIER, Herle GAILLARD, Fabienne LHERMINIER, Pascale AS 1:3;2:1,2;3:2;4:2; FF 1:;2:;3:PDG-DOP-DCB-OPS-LPO;4:PDG-DOP-DCB-OPS-LPO; C1 CNRS, Univ Paris 06, Inst Rech Dev, UMR 7617,Inst Pierre Simon Laplace, Lab Oceanog & Climat Expt & Approches Numer, F-75252 Paris, France. Univ Bretagne Occidentale, Inst Francais Rech Exploitat Mer, CNRS,UMR 6523, Lab Phys Oceans, Plouzane, France. Univ Paris 06, Inst Rech Dev, UMR 7617,Inst Pierre Simon Laplace, Lab Oceanog & Climat Expt & Approches Numer, F-75252 Paris, France. C2 CNRS, FRANCE IFREMER, FRANCE UNIV PARIS 06, FRANCE SI BREST SE PDG-DOP-DCB-OPS-LPO IN WOS Ifremer jusqu'en 2018 copubli-france copubli-univ-france IF 2.784 TC 9 TU Centre national de la recherche scientifique Institut de recherche pour le développement Institut français de recherche pour l'exploitation de la mer Muséum national d'histoire naturelle Université Pierre et Marie Curie Université de Bretagne Occidentale UR https://archimer.ifremer.fr/doc/2005/publication-359.pdf LA English DT Article CR POMME - T0 POMME 1 LEG1 POMME 1 LEG2 POMME 2 LEG1 POMME 2 LEG2 POMME 3 - LEG 1 POMME 3 - LEG 2 POMME 3/5 BO Thalassa L'Atalante Pelagia DE ;Turbulent mixing;Tnertia gravity waves AB The purpose of this paper is to characterize inertia-gravity waves (IGW) activity and to investigate the variability of these waves in relationship to atmospheric forcing and larger-scale motions. To this aim, we analyzed Eulerian measurements of horizontal currents and temperature collected over 1 year during the Programme Océan Multidisciplinaire Méso Echelle (POMME). We focused on the main frequency components of the IGW spectrum, namely the inertial frequency f and the semidiurnal frequency M2. Time evolution of the relative energy of these two components gave evidence of isolated events of high intensity. We performed a detailed analysis of these events and identified mechanisms of generation of these waves. Localized spots of intense, near-inertial IGW were observed in winter. During the mixed layer deepening, one event was correlated with plume-like structures resulting from peaks of intense surface cooling. This suggests a local generation process driven by strong downward vertical motions. Instead, other events of strong IGW could be related to submesoscale features, characteristic of a frontal region, in particular, wave trapping within anticyclonic eddies. In contrast, a downward energy propagation down to about 500 m below the mixed layer was isolated after a stormy period. Eventually, internal tidal beams, possibly generated at a nearby seamount, intermittently crossed the mooring, though less energetically than the previous events. Last, we estimated the eddy diffusivity from the velocity vertical shear. Large variations were obtained, from 10-6 m2/s up to 10-3 m2/s, consistent with the intense events previously isolated. PY 2005 PD JUL SO Journal of Geophysical Union - Research C - Oceans SN 0148-0227 PU American Geophysical Union VL 110 IS C7 UT 000230942600001 DI 10.1029/2004JC002747 ID 359 ER EF