Wind-Forced Variability of the Deep Eastern North Pacific: Observations of Seafloor Pressure and Abyssal Currents.
WOODS HOLE OCEANOGRAPHIC INSTITUTION MA DEPT OF GEOLOGY AND GEOPHYSICS
Pagination or Media Count:
Data from an array of bottom pressure gauges and a string of current meters in the vicinity of 47 deg N, 139 deg W, are used to examine the deep ocean variability forced by ocean surface wind stress curl from August 1987 to June 1988. Bottom geostrophic currents are computed from the pressure gauge array, and these correspond well to the long period directly measured currents at 3000 m. The supratidal period bottom pressure variations are coherent at 95 confidence with the wind stress curl in period bands of 3-4 days and 15-60 days but removed in distances of 400 and 700 km to the northwest and the southeast, respectively. A linear, two-layer hydrodynamic model is used to examine the theoretical forcing produced by random phased surface wind fields for the conditions of the eastern north Pacific and the 15 to 60 day period observed response is reproduced credibly. To model 3 to 15 day variations, more realistic models are required.
- Physical and Dynamic Oceanography