Mesoscale and wind-driven intra-annual variability in the East Auckland Current

Abstract Intra-annual variability in the East Auckland Current (EAuC) was studied using a year-long timeseries of in situ and remotely-sensed velocity, temperature and salinity observations. Satellite-derived velocities correlated well ( $$\hbox {r} > 0.75$$ r > 0.75 ) with in situ observation...

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Autores principales:	Rafael Santana, Sutara H. Suanda, Helen Macdonald, Joanne O’Callaghan
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/da5bd25c4fc14eaeb325e0b4f1a7ff94
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spelling	oai:doaj.org-article:da5bd25c4fc14eaeb325e0b4f1a7ff942021-12-02T15:37:58ZMesoscale and wind-driven intra-annual variability in the East Auckland Current10.1038/s41598-021-89222-32045-2322https://doaj.org/article/da5bd25c4fc14eaeb325e0b4f1a7ff942021-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-89222-3https://doaj.org/toc/2045-2322Abstract Intra-annual variability in the East Auckland Current (EAuC) was studied using a year-long timeseries of in situ and remotely-sensed velocity, temperature and salinity observations. Satellite-derived velocities correlated well ( $$\hbox {r} > 0.75$$ r > 0.75 ) with in situ observations and well-represent the long-term ( $$> 30$$ > 30 days) variability of the upper ocean circulation. Four mesoscale eddies were observed during the year (for 260 days) which generated distinct flows between the continental slope and rise. The EAuC dominated the circulation in the continental shelf break, slope and rise for 110 days and generated the most energetic events associated with wind forcing. Current variability on the continental slope was coherent with along-slope wind stress (wind stress curl) at periods between 4 and 12 days (16 and 32 days). We suggest that along-slope winds generated offshore Ekman transport, uplift on the shelf-break, and a downwind geostrophic jet on the slope. In contrast, positive wind stress curl caused convergence of water, downwelling, and increased the current speed in the region. Bottom Ekman transport, generated by the EAuC, was suggested to have caused the largest temperature anomaly ( $$-1.5 ^{\circ }\hbox {C}$$ - 1 . 5 ∘ C ) at the continental shelf-break.Rafael SantanaSutara H. SuandaHelen MacdonaldJoanne O’CallaghanNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Rafael Santana Sutara H. Suanda Helen Macdonald Joanne O’Callaghan Mesoscale and wind-driven intra-annual variability in the East Auckland Current
description	Abstract Intra-annual variability in the East Auckland Current (EAuC) was studied using a year-long timeseries of in situ and remotely-sensed velocity, temperature and salinity observations. Satellite-derived velocities correlated well ( $$\hbox {r} > 0.75$$ r > 0.75 ) with in situ observations and well-represent the long-term ( $$> 30$$ > 30 days) variability of the upper ocean circulation. Four mesoscale eddies were observed during the year (for 260 days) which generated distinct flows between the continental slope and rise. The EAuC dominated the circulation in the continental shelf break, slope and rise for 110 days and generated the most energetic events associated with wind forcing. Current variability on the continental slope was coherent with along-slope wind stress (wind stress curl) at periods between 4 and 12 days (16 and 32 days). We suggest that along-slope winds generated offshore Ekman transport, uplift on the shelf-break, and a downwind geostrophic jet on the slope. In contrast, positive wind stress curl caused convergence of water, downwelling, and increased the current speed in the region. Bottom Ekman transport, generated by the EAuC, was suggested to have caused the largest temperature anomaly ( $$-1.5 ^{\circ }\hbox {C}$$ - 1 . 5 ∘ C ) at the continental shelf-break.
format	article
author	Rafael Santana Sutara H. Suanda Helen Macdonald Joanne O’Callaghan
author_facet	Rafael Santana Sutara H. Suanda Helen Macdonald Joanne O’Callaghan
author_sort	Rafael Santana
title	Mesoscale and wind-driven intra-annual variability in the East Auckland Current
title_short	Mesoscale and wind-driven intra-annual variability in the East Auckland Current
title_full	Mesoscale and wind-driven intra-annual variability in the East Auckland Current
title_fullStr	Mesoscale and wind-driven intra-annual variability in the East Auckland Current
title_full_unstemmed	Mesoscale and wind-driven intra-annual variability in the East Auckland Current
title_sort	mesoscale and wind-driven intra-annual variability in the east auckland current
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/da5bd25c4fc14eaeb325e0b4f1a7ff94
work_keys_str_mv	AT rafaelsantana mesoscaleandwinddrivenintraannualvariabilityintheeastaucklandcurrent AT sutarahsuanda mesoscaleandwinddrivenintraannualvariabilityintheeastaucklandcurrent AT helenmacdonald mesoscaleandwinddrivenintraannualvariabilityintheeastaucklandcurrent AT joanneocallaghan mesoscaleandwinddrivenintraannualvariabilityintheeastaucklandcurrent
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Mesoscale and wind-driven intra-annual variability in the East Auckland Current

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