Zonally Elongated Transient Flows: Phenomenology and Sensitivity Analysis

M. V. Rudko, Igor Kamenkovich, M. Iskadarani, Arthur J Mariano

Research output: Contribution to journalArticle

3 Scopus citations


This study explores the phenomenology of zonally elongated transients (ZELTs) in the ocean and the sensitivity of their properties to changes in several environmental factors. ZELTs explain a major part of anisotropy in mesoscale turbulent flow. Calculations are performed in a two-layer, quasi-geostrophic model. Empirical Orthogonal Functions (EOF) decomposition allows for the separation of ZELTs from the background turbulent flow as several leading EOF modes. The leading Extended EOF reveals that ZELTs propagate westward at the speed of ˜ cm s−1. The decrease in the planetary vorticity gradient and increase in the bottom drag coefficient each leads to flattening of the variance spectrum, isotropization of the leading EOF, and fast decay of the autocorrelation function of its corresponding Principal Component.

Original languageEnglish (US)
Pages (from-to)3982-4002
Number of pages21
JournalJournal of Geophysical Research: Oceans
Issue number6
StatePublished - Jun 1 2018



  • EOF filtering
  • Fourier filtering
  • quasi-geostrophic model
  • response surface
  • sensitivity analysis
  • zonally elongated transients

ASJC Scopus subject areas

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

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