DIRECT EVIDENCE FOR AN EKMAN BALANCE IN THE CALIFORNIA CURRENT

Authors
Citation
Tk. Chereskin, DIRECT EVIDENCE FOR AN EKMAN BALANCE IN THE CALIFORNIA CURRENT, J GEO RES-O, 100(C9), 1995, pp. 18261-18269
Citations number
15
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Oceanografhy
Journal title
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
ISSN journal
2169-9275 → ACNP
Volume
100
Issue
C9
Year of publication
1995
Pages
18261 - 18269
Database
ISI
SICI code
2169-9275(1995)100:C9<18261:DEFAEB>2.0.ZU;2-K
Abstract
Moored acoustic Doppler current profiler velocity estimates and buoy w ind observations made during a period of moderate southward winds were used to test the Ekman balance at a Site in the California Current. A s in prior studies, the wind driven flow was separated from the total flow by subtraction of a deep reference current. The wind-driven flow was shown to be in an Ekman balance on daily timescales over a period of several months. The mean observed transport was to the right of the wind and agreed to within 3% in magnitude and 4 degrees in phase with the predicted Ekman transport, although the error bar was about 20%. The mean velocity profile was a smooth spiral, qualitatively similar ( although flatter) than the theoretical Ekman spiral. From the observed mean momentum balance, profiles of the turbulent stress and eddy visc osity were inferred. Eddy viscosity estimates within the wind mixed la yer were O(100 cm(2) s(-1)).