In:
Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 90, No. C6 ( 1985-11-20), p. 11765-11778
Abstract:
The evolution of an upwelling filament was studied over a 2‐week period by using satellite infrared images, and its thermohaline structure was mapped in situ. The surface velocity field consisted of a large meander extending offshore for at least 300 km. The northern branch was ∼40 km wide, flowing offshore at a peak velocity of 0.55 m/s; the southern branch was flowing inshore at 0.35 m/s. The offshore transport was more than 10 6 m 3 s −1 , larger than the Ekman transport. The meander was unstable to barotropic instabilities at a scale of ∼15 km. From a succession of images a surface convergence γ ≈ 8·10 −6 s −1 over 20 km was observed near the sharp front limiting the filament to the south. The ∼350 m width of the front indicates a separation of scales between the large‐scale strain field and the mixed‐layer turbulence parameterized with an eddy diffusion coefficient K H ≈ 0.25 m 2 s −1 . Thermohaline layers that originated at the convergence near the sharp front suggest a secondary circulation subducting denser waters to the south underneath the lighter northern water.
Type of Medium:
Online Resource
ISSN:
0148-0227
DOI:
10.1029/JC090iC06p11765
Language:
English
Publisher:
American Geophysical Union (AGU)
Publication Date:
1985
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