FN Archimer Export Format PT J TI Acoustic Tomography in the Canary Basin: Meddies and Tides BT AF DUSHAW, Brian GAILLARD, Fabienne TERRE, Thierry AS 1:1;2:2;3:2; FF 1:;2:PDG-ODE-LOPS-OH;3:PDG-ODE-LOPS; C1 Nansen Environm & Remote Sensing Ctr, Bergen, Norway. Univ Brest, CNRS, Lab Oceanog Phys & Spatiale, IFREMER,IRD,IUEM, Plouzane, France. C2 NERSC, NORWAY IFREMER, FRANCE SI BREST SE PDG-ODE-LOPS-OH PDG-ODE-LOPS UM LOPS IN WOS Ifremer jusqu'en 2018 copubli-europe IF 2.711 TC 6 UR https://archimer.ifremer.fr/doc/00404/51519/52112.pdf LA English DT Article CR CAMBIOS DE ;Meddy;acoustic tomography;Canary Basin;Mediterranean water;internal tides AB An acoustic propagation experiment over 308-km range conducted in the Canary Basin in 1997–1998 was used to assess the ability of ocean acoustic tomography to measure the flux of Mediterranean water and Meddies. Instruments on a mooring adjacent to the acoustic path measured the southwestward passage of a strong Meddy in temperature, salinity, and current. Over nine months of transmissions, the acoustic arrival pattern was an initial broad stochastic pulse varying in duration by 250 to 500 ms, followed eight stable, identified ray arrivals. Small-scale sound speed fluctuations from Mediterranean water parcels littered around the sound channel axis caused acoustic scattering. Internal waves contributed more modest acoustic scattering. Based on simulations, the main effect of a Meddy passing across the acoustic path is the formation of many early-arriving, near-axis rays, but these rays are thoroughly scattered by the small-scale Mediterranean water fluctuations. A Meddy decreases the deep-turning ray travel times by 10–30 ms. The dominant acoustic signature of a Meddy is therefore the expansion of the width of the initial stochastic pulse. While this signature appears inseparable from the other effects of Mediterranean water in this region, the acoustic time series indicates the steady passage of Mediterranean water across the acoustic path. Tidal variations caused by the mode-1 internal tides were measured by the acoustic travel times. The observed internal tides were partly predicted using a recent global model for such tides derived from satellite altimetry. PY 2017 PD NOV SO Journal Of Geophysical Research-oceans SN 2169-9275 PU Amer Geophysical Union VL 122 IS 11 UT 000418089400036 BP 8983 EP 9003 DI 10.1002/2017JC013356 ID 51519 ER EF