Observations of submesoscale eddies using high-frequency radar-derived kinematic and dynamic quantities

Cited 58 time in webofscience Cited 0 time in scopus
  • Hit : 244
  • Download : 0
The spatio-temporal variability of submesoscale eddies off southern San Diego is investigated with two-year observations of subinertial surface currents [O(1) m depth] derived from shore-based high-frequency radars. The kinematic and dynamic quantities velocity potential, stream function, divergence, vorticity, and deformation rates are directly estimated from radial velocity maps using optimal interpolation. For eddy detection, the winding-angle approach based on flow geometry is applied to the calculated stream function. A cluster of nearly enclosed streamlines with persistent vorticity in time is identified as an eddy. About 700 eddies were detected for each rotation (clockwise and counter-clockwise). The two rotations show similar statistics with diameters in the range of 5-25 km and Rossby number of 0.2-2. They persist for 1-7 days with weak seasonality and migrate with a translation speed of 4-15 cm s(-1) advected by background currents. The horizontal structure of eddies exhibits nearly symmetric tangential velocity with a maximum at the defined radius of the eddy, non-zero radial velocity due to background flows, and Gaussian vorticity with the highest value at the center. In contrast divergence has no consistent spatial shape. Two episodic events are presented with other in situ data (subsurface current and temperature profiles, and local winds) as an example of frontal-scale secondary circulation associated with drifting submesoscale eddies. (C) 2010 Elsevier Ltd. All rights reserved.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2010-09
Language
English
Article Type
Article
Citation

CONTINENTAL SHELF RESEARCH, v.30, no.15, pp.1639 - 1655

ISSN
0278-4343
DOI
10.1016/j.csr.2010.06.011
URI
http://hdl.handle.net/10203/104513
Appears in Collection
ME-Journal Papers(저널논문)
Files in This Item
There are no files associated with this item.
This item is cited by other documents in WoS
⊙ Detail Information in WoSⓡ Click to see webofscience_button
⊙ Cited 58 items in WoS Click to see citing articles in records_button

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0