Affiliation:
1. Frontiers Science Center for Deep Ocean Multispheres and Earth System School of Marine Technology Ocean University of China Qingdao China
2. Laboratory for Regional Oceanography and Numerical Modeling Laoshan Laboratory Qingdao China
Abstract
AbstractThe quasi‐geostrophy (QG) of oceanic eddies is scientifically challenging and observationally puzzling because of its marginally balanced yet resolvable nature. Here a quantitative analysis on the degree of eddy QG is carried out using altimetric sea surface height data from multiple missions. We propose a metric of Rossby period of deformation (Td) as an extension to the Rossby radius of deformation (Rd) and its related phase speed of the first baroclinic Rossby wave (Cd) which satisfies Td = Rd/Cd, implying that any robust eddy with a length scale of ∼Rd is supposed to survive for a period longer than the Rossby period ∼Td under an average propagation speed of ∼Cd if a quasi‐geostrophic balance can be maintained. In terms of a generalized Rossby deformation with regards to Rd, Td, and Cd, three indices are defined as baselines to characterize the spatial, temporal, and dynamic aspects of eddy QG according to their effective size, actual lifetime, and propagation speed, respectively.
Funder
National Natural Science Foundation of China
Publisher
American Geophysical Union (AGU)
Subject
Earth and Planetary Sciences (miscellaneous),Space and Planetary Science,Geochemistry and Petrology,Geophysics,Oceanography
Cited by
1 articles.
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1. Medium-range forecasting of oceanic eddy trajectory;International Journal of Digital Earth;2024-01-09