Statistics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmos41c1242m&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #OS41C-1242
Statistics
4512 Currents, 4516 Eastern Boundary Currents, 4520 Eddies And Mesoscale Processes, 4528 Fronts And Jets
Scientific paper
Recently, prominent jet-like features of the oceanic circulation, called striations, with the meridional scale of O(300-500 km) and extending for thousands of kilometers in length have been detected in satellite and in situ observations and high-resolution numerical models. In this study, we analyze data of the Ocean General Circulation Model for the Earth Simulator (OFES) to understand the dynamics of the striations in the eastern parts of the subtropical North and South Pacific, where the striations are well pronounced both in the numerical model and observations. Remarkably, the striations are slightly tilted relative to the east-west direction in accord with the sign and strength of the meridional component of the large-scale flow. The internal dynamics of the striations are evaluated by assessing major terms of the local vorticity balance. On the spatial scale of the striations, the dominant terms in the time averaged relative vorticity equation are the local advection of relative vorticity by the large-scale flow, vortex stretching term and advection of planetary vorticity by the striations. The estimated balance agrees with the one, anticipated for the stationary Rossby wave, whose propagation against the large-scale flow is balanced by the advection by the flow. Using the satellite sea level anomaly data and a simple eddy-detection technique we also discuss the statistics of eddies in the study domains and their paths relative to the quasi-stationary striations.
Maximenko Nikolai
Melnichenko O.
Sasaki Hironobu
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