Global energy spectrum of the general oceanic circulation

Storer, Benjamin A.; Buzzicotti, Michele; Khatri, Hemant; Griffies, Stephen M.; Aluie, Hussein

doi:10.1038/s41467-022-33031-3

Title: Global energy spectrum of the general oceanic circulation

Journal Article · Fri Sep 09 00:00:00 EDT 2022 · Nature Communications

DOI:https://doi.org/10.1038/s41467-022-33031-3· OSTI ID:1886422

Storer, Benjamin A.;

; Khatri, Hemant; Griffies, Stephen M.;

AbstractAdvent of satellite altimetry brought into focus the pervasiveness of mesoscale eddies $$$${{{{{{{\bf{{{{{{{{\mathcal{O}}}}}}}}}}}}}}}}({100})$$$$ O ( 100 ) km in size, which are the ocean’s analogue of weather systems and are often regarded as the spectral peak of kinetic energy (KE). Yet, understanding of the ocean’s spatial scales has been derived mostly from Fourier analysis in small "representative” regions that cannot capture the vast dynamic range at planetary scales. Here, we use a coarse-graining method to analyze scales much larger than what had been possible before. Spectra spanning over three decades of length-scales reveal the Antarctic Circumpolar Current as the spectral peak of the global extra-tropical circulation, at ≈ 104 km, and a previously unobserved power-law scaling over scales larger than 103 km. A smaller spectral peak exists at ≈ 300 km associated with mesoscales, which, due to their wider spread in wavenumber space, account for more than 50% of resolved surface KE globally. Seasonal cycles of length-scales exhibit a characteristic lag-time of ≈ 40 days per octave of length-scales such that in both hemispheres, KE at 102 km peaks in spring while KE at 103 km peaks in late summer. These results provide a new window for understanding the multiscale oceanic circulation within Earth’s climate system, including the largest planetary scales.

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Research Organization:: Univ. of Rochester, NY (United States). Lab. for Laser Energetics

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); National Aeronautics and Space Administration (NASA); National Science Foundation (NSF)

Grant/Contract Number:: SC0020229; SC0019329; SC0014318; NA0003856; NA0003914; AC02-05CH11231; 80NSSC18K0772; OCE-2123496; PHY-2020249; PHY-2206380

OSTI ID:: 1886422

Alternate ID(s):: OSTI ID: 1897088; OSTI ID: 1906962

Journal Information:: Nature Communications, Journal Name: Nature Communications Vol. 13 Journal Issue: 1; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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