FN Archimer Export Format PT J TI A near-inertial mode observed within a Gulf Stream warm-core ring BT AF JOYCE, Terrence M. TOOLE, John M. KLEIN, Patrice THOMAS, Leif N. AS 1:1;2:1;3:2;4:3; FF 1:;2:;3:;4:; C1 Woods Hole Oceanog Inst, Woods Hole, MA 02543 USA. IFREMER, Lab Phys Oceans, Plouzane, France. Stanford Univ, Dept Environm Earth Syst Sci, Stanford, CA 94305 USA. C2 WOODS HOLE, USA CNRS, FRANCE UNIV STANFORD, USA TC 33 UR https://archimer.ifremer.fr/doc/00148/25929/23966.pdf LA English DT Article DE ;near-inertial waves;warm-core ring;velocity fine structure AB Layering of ocean velocity fine structure has been coherently observed across the entire extent of a Gulf Stream warm-core ring using a shipboard acoustic Doppler current profiler system in September 2009 and independently sampled as the ring transited a moored array. Lines of constant velocity phase generally followed isopycnals as they deepened within the ring center. We also observed a clear separation of the vertical structure of the flows associated with the ring (of order 0.5m/s) with the shorter (200m) and less energetic (similar to 0.2m/s) flows of the velocity fine structure, which was further observed to rotate clockwise with increasing depth, consistent with downward propagating near-inertial waves (NIWs). Observations are consistent with a ring-scale NIW packet, probably wind forced, that shows enhanced NIW energy within the sloping pycnocline at depths of 300-700m. Evidence of wind-forced NIWs within anticylonic eddies in a numerical simulation shows some similar features to our observations, which we try to understand physically with basic WKB-type wave/current dynamics along the lines of previously published work and a new calculation of NIW trapping within an isolated, baroclinic vortex. PY 2013 PD APR SO Journal Of Geophysical Research-oceans SN 0148-0027 PU Amer Geophysical Union VL 118 IS 4 UT 000320324100011 BP 1797 EP 1806 DI 10.1002/jgrc.20141 ID 25929 ER EF