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  Identifying and characterizing subsurface tropical instability waves in the Atlantic Ocean in simulations and observations

Specht, M. S., Jungclaus, J. H., & Bader, J. (2021). Identifying and characterizing subsurface tropical instability waves in the Atlantic Ocean in simulations and observations. Journal of Geophysical Research: Oceans, 126: e2020JC017013. doi:10.1029/2020JC017013.

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 Urheber:
Specht, Mia Sophie1, 2, Autor           
Jungclaus, Johann H.1, Autor                 
Bader, Juergen1, Autor           
Affiliations:
1Director’s Research Group OES, The Ocean in the Earth System, MPI for Meteorology, Max Planck Society, ou_913553              
2IMPRS on Earth System Modelling, MPI for Meteorology, Max Planck Society, Bundesstraße 53, 20146 Hamburg, DE, ou_913547              

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 Zusammenfassung: Recent observations in the Pacific Ocean suggest that, apart from tropical instability waves (TIWs) at the surface, there also exist subsurface tropical instability waves (subTIWs), which can alter vertical mixing. However, the extent to which subTIWs impact mixing and heat flux is still unknown. Moreover, studies on subTIWs have been conducted exclusively in the Pacific. Here, we show the presence of subTIWs in the Atlantic for the first time, using mooring observations. Analyzing 16 years of simulations of a comprehensive, global, high-resolution ocean model, we characterize subTIWs in the Atlantic with regard to their spatial and temporal variability and investigate their influence on vertical mixing. We find subTIWs in the Atlantic between 40 and 90 m depth in both the model and observations. Furthermore, the model results reveal that unlike TIWs, subTIWs frequently also occur south of the Equator in the Atlantic Ocean. We show that subTIWs induce an oscillating multilayer shear structure, suggesting subTIWs to destabilize the mean flow and thereby induce mixing. This is strongest north of the Equator, where both TIWs and subTIWs act simultaneously. We conclude that despite similar characteristics, TIWs and subTIWs are distinct waves which both impact mixing and heat flux within the thermocline. Therefore, future studies of thermocline dynamics in the tropical oceans should not only consider TIWs but also take into account the effect of subTIWs, particularly in the subTIW dominated region south of the Equator. © 2021 The Authors

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Sprache(n): eng - English
 Datum: 2020-112020-112021-09-012021-09-142021-10
 Publikationsstatus: Erschienen
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 Ort, Verlag, Ausgabe: -
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 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1029/2020JC017013
BibTex Citekey: SpechtJungclausEtAl2021
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Titel: Journal of Geophysical Research: Oceans
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Hoboken, NJ : Wiley
Seiten: - Band / Heft: 126 Artikelnummer: e2020JC017013 Start- / Endseite: - Identifikator: ISSN: 2169-9291
CoNE: https://pure.mpg.de/cone/journals/resource/2169-9291