Consiglio Nazionale delle Ricerche

Tipo di prodottoArticolo in rivista
TitoloPatterns of the loop current system and regions of sea surface height variability in the eastern Gulf of Mexico revealed by the self-organizing maps
Anno di pubblicazione2016
Autore/iLiu YG, Weisberg RH, Vignudelli S, Mitchum GT
Affiliazioni autoriCollege of Marine Science, University of South Florida, St. Petersburg, FL, United States; Consiglio Nazionale Delle Ricerche, Area Ricerca CNR, Via Moruzzi 1, Pisa, Italy
Autori CNR e affiliazioni
  • inglese
AbstractThe Self-Organizing Map (SOM), an unsupervised learning neural network, is employed to extract patterns evinced by the Loop Current (LC) system and to identify regions of sea surface height (SSH) variability in the eastern Gulf of Mexico (GoM) from 23 years (1993-2015) of altimetry data. Spatial patterns are characterized as different LC extensions and different stages in the process of LC eddy shedding. The temporal evolutions and the frequency of occurrences of these patterns are obtained, and the typical trajectories of the LC system progression on the SOM grid are investigated. For an elongated, northwest-extended, or west-positioned LC, it is common for the LC anticyclonic eddy (LCE) to separate and propagate into the western GoM, while an initially separated LCE in close proximity to the west Florida continental slope often reattaches to the LC and develops into an elongated LC, or reduces intensity locally before moving westward as a smaller eddy. Regions of differing SSH variations are also identified using the joint SOM-wavelet analysis. Along the general axis of the LC, SSH exhibits strong variability on time scales of 3 months to 2 years, also with energetic intraseasonal variations, which is consistent with the joint Empirical Orthogonal Function (EOF)-wavelet analysis. In the more peripheral regions, the SSH has a dominant seasonal variation that also projects across the coastal ocean. The SOM, when applied to both space and time domains of the same data, provides a powerful tool for diagnosing ocean processes from such different perspectives.
Lingua abstractinglese
Altro abstract-
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Pagine da2347
Pagine a2366
Pagine totali-
RivistaJournal of geophysical research. Oceans (Print)
Attiva dal 2013
Editore: Wiley Subscription Services - Hoboken
Paese di pubblicazione: Stati Uniti d'America
Lingua: inglese
ISSN: 2169-9275
Titolo chiave: Journal of geophysical research. Oceans (Print)
Titolo proprio: Journal of geophysical research. Oceans.
Titolo abbreviato: J. geophys. res. Ocean. (Print)
Numero volume della rivista121
Fascicolo della rivista4
Verificato da referee-
Stato della pubblicazionePublished version
Indicizzazione (in banche dati controllate)
  • Scopus (Codice:2-s2.0-84962920833)
  • ISI Web of Science (WOS) (Codice:000383462300015)
Parole chiaveDual Self-Organizing Map (SOM) analysis, Gulf of Mexico, joint EOF-wavelet analysis, joint SOM-wavelet analysis, Loop Current, mesoscale eddies, satellite altimetry
Link (URL, URI)
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Strutture CNR
  • IBF — Istituto di biofisica
Moduli/Attività/Sottoprogetti CNR
  • TA.P04.030.001 : Biofisica e biologia molecolare nello studio dei processi ambientali
Progetti Europei-
Patterns of the loop current system and regions of sea surface height variability in the eastern Gulf of Mexico revealed by the self-organizing maps (documento privato )
Tipo documento: application/pdf