The Effect of Upper Ocean Eddies on the Non-Steric Contribution to the Barotropic Mode

Details The Effect of Upper Ocean Eddies on the Non-Steric Contribution to the Barotropic Mode The Effect of Upper Ocean Eddies on the Non-Steric Contribution to the Barotropic Mode

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.2713s&link_type=abstract

Geophysical Research Letters, Volume 27, Issue 17, p. 2713-2716

Physics

1

Oceanography: General: Numerical Modeling, Oceanography: Physical: Eddies And Mesoscale Processes, Oceanography: Physical: Sea Level Variations, Oceanography: Physical: Upper Ocean Processes

Scientific paper

The non-steric contribution to sea surface height (SSH) variability hampers the use of satellite altimeter data in mapping steric-related variability. Here, two eddy-resolving 1/16° world ocean simulations are used to investigate the effects of mesoscale flow instabilities on the non-steric (or abyssal ocean) contribution to the global barotropic mode. Model results show the non-steric component accounting for >50% of the total SSH variability over 37% of the world ocean in the model, predominantly at mid and high latitudes. Most of this is either wind-driven and deterministic or eddy-driven and nondeterministic. Upper ocean flow instabilities drive deep flows and generate non-steric SSH variability maxima (5-10 cm rms or more) in many major current systems throughout the world ocean. Resulting ocean anomalies are a nondeterministic response to atmospheric forcing and an eddy-resolving data-assimilative ocean model that demonstrates the essential dynamics is needed to depict their evolution.

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