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Article

Similarities and Contrasts in Time-Mean Striated Surface Tracers in Pacific Eastern Boundary Upwelling Systems: The Role of Ocean Currents in Their Generation

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Department of Geophysics, University of Concepcion, Concepcion 4070386, Chile
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Météo-France, Direction Interrégionale Antilles-Guyane, 97200 Fort-de-France, Martinique, France
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Millennium Institute of Oceanography (IMO), University of Concepcion, Concepcion 4070386, Chile
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University of Brest, CNRS, IRD, Ifremer, Laboratoire d’Océanographie Physique et Spatiale (LOPS), IUEM, Brest 29280, France
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International Pacific Research Center, School of Ocean and Earth Science and Technology, University of Hawaii at Manoa, Honolulu, HI 96822, USA
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School of Marine Sciences, Pontifical Catholic University of Valparaiso, Valparaiso 2340000, Chile
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Laboratoire d’Etudes en Géophysique et Océanographie Spatiale, Université de Toulouse, CNES, CNRS, IRD, UPS, 31400 Toulouse, France
*
Author to whom correspondence should be addressed.
Academic Editor: Pavel S. Berloff
Fluids 2021, 6(12), 455; https://doi.org/10.3390/fluids6120455
Received: 6 June 2021 / Revised: 7 November 2021 / Accepted: 10 November 2021 / Published: 15 December 2021
(This article belongs to the Collection Geophysical Fluid Dynamics)
Eastern boundary upwelling systems feature strong zonal gradients of physical and biological properties between cool, productive coastal oceans and warm, oligotrophic subtropical gyres. Zonal currents and jets (striations) are therefore likely to contribute to the transport of water properties between coastal and open oceanic regions. For the first time, multi-sensor satellite data are used to characterize the time-mean signatures of striations in sea surface temperature (SST), salinity (SSS), and chlorophyll-a (Chl-a) in subtropical eastern North/South Pacific (ENP/ESP) upwelling systems. In the ENP, tracers exhibit striated patterns extending up to ~2500 km offshore. Striated signals in SST and SSS are highly correlated with quasi-zonal jets, suggesting that these jets contribute to SST/SSS mesoscale patterns via zonal advection. Striated Chl-a anomalies are collocated with sea surface height (SSH) bands, a possible result of mesoscale eddy trains trapping nutrients and forming striated signals. In the ESP, the signature of striations is only found in SST and coincides with the SSH bands, consistently with quasi-zonal jets located outside major zonal tracer gradients. An interplay between large-scale SST/SSS advection by the quasi-zonal jets, mesoscale SST/SSS advection by the large-scale meridional flow, and eddy advection may explain the persistent ENP hydrographic signature of striations. These results underline the importance of quasi-zonal jets for surface tracer structuring at the mesoscale. View Full-Text
Keywords: striations; satellite data; sea surface temperature; sea surface salinity; chlorophyll-a; eastern boundaries; Pacific Ocean striations; satellite data; sea surface temperature; sea surface salinity; chlorophyll-a; eastern boundaries; Pacific Ocean
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MDPI and ACS Style

Belmadani, A.; Auger, P.-A.; Maximenko, N.; Gomez, K.; Cravatte, S. Similarities and Contrasts in Time-Mean Striated Surface Tracers in Pacific Eastern Boundary Upwelling Systems: The Role of Ocean Currents in Their Generation. Fluids 2021, 6, 455. https://doi.org/10.3390/fluids6120455

AMA Style

Belmadani A, Auger P-A, Maximenko N, Gomez K, Cravatte S. Similarities and Contrasts in Time-Mean Striated Surface Tracers in Pacific Eastern Boundary Upwelling Systems: The Role of Ocean Currents in Their Generation. Fluids. 2021; 6(12):455. https://doi.org/10.3390/fluids6120455

Chicago/Turabian Style

Belmadani, Ali, Pierre-Amaël Auger, Nikolai Maximenko, Katherine Gomez, and Sophie Cravatte. 2021. "Similarities and Contrasts in Time-Mean Striated Surface Tracers in Pacific Eastern Boundary Upwelling Systems: The Role of Ocean Currents in Their Generation" Fluids 6, no. 12: 455. https://doi.org/10.3390/fluids6120455

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