English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Along-track wavenumber spectral densities of sea surface height (SSH) areestimated from Jason-2 altimetry data as a function of spatial location andcalendar month, to understand the seasonality of meso- and submesoscalebalanced dynamics across the global ocean. Regions with significant mode-1 andmode-2 baroclinic tides are rejected, restricting the analysis to theextratropics. Where balanced motion dominates, the SSH spectral density isaveraged over all pass segments in a region for each calendar month, and is fitto a 4-parameter model consisting of a flat plateau at low wavenumbers, atransition at wavenumber $k_0$ to a red power law spectrum $k^{-s}$, and awhite spectrum at high wavenumbers that models the altimeter noise. The monthlytime series of the model parameters are compared to the evolution of the mixedlayer. The annual mode of the spectral slope $s$ reaches a minimum after themixed layer deepens, and the annual mode of the bandpassed kinetic energy inthe ranges $[2k_0,4 k_0]$ and $[k_0,2 k_0]$ peak $\sim$2 and $\sim$4 months,respectively, after the maximum of the annual mode of the mixed layer depth.This analysis is consistent with an energization of the submesoscale by awinter mixed layer instability followed by an inverse cascade to the mesoscale,in agreement with prior modeling studies and in situ measurements. Theseresults are compared to prior modeling, in situ, and satellite investigationsof specific regions, and are broadly consistent with them within measurementuncertainties.

Seasonality and spatial dependence of meso- and submesoscale ocean currents from along-track satellite altimetry