Southeastern Tropical Atlantic Changing From Subtropical to Tropical Conditions

A warming and freshening trend of the mixed layer in the upper southeastern tropical Atlantic Ocean (SETA) is observed by the Argo float array during the time period of 2006–2020. The associated ocean surface density reduction impacts upper-ocean stratification that intensified by more than 30% in t...

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Autores principales:	Marisa Roch, Peter Brandt, Sunke Schmidtko, Filomena Vaz Velho, Marek Ostrowski
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	southeastern tropical Atlantic Ocean decadal variability upper-ocean stratification increase mixed layer warming and freshening heave and spice anomalies primary productivity Science Q General. Including nature conservation, geographical distribution QH1-199.5
Acceso en línea:	https://doaj.org/article/e7ac25164c7842f485dccea290fb5170
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spelling	oai:doaj.org-article:e7ac25164c7842f485dccea290fb51702021-12-01T07:49:22ZSoutheastern Tropical Atlantic Changing From Subtropical to Tropical Conditions2296-774510.3389/fmars.2021.748383https://doaj.org/article/e7ac25164c7842f485dccea290fb51702021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/fmars.2021.748383/fullhttps://doaj.org/toc/2296-7745A warming and freshening trend of the mixed layer in the upper southeastern tropical Atlantic Ocean (SETA) is observed by the Argo float array during the time period of 2006–2020. The associated ocean surface density reduction impacts upper-ocean stratification that intensified by more than 30% in the SETA region since 2006. The initial typical subtropical stratification with a surface salinity maximum is shifting to more tropical conditions characterized by warmer and fresher surface waters and a subsurface salinity maximum. During the same period isopycnal surfaces in the upper 200 m are shoaling continuously. Observed wind stress changes reveal that open ocean wind curl-driven upwelling increased, however, partly counteracted by reduced coastal upwelling due to weakened alongshore southerly winds. Weakening southerly winds might be a reason why tropical surface waters spread more southward reaching further into the SETA region. The mixed layer warming and freshening and associated stratification changes might impact the marine ecosystem and pelagic fisheries in the Angolan and northern Namibian upwelling region.Marisa RochPeter BrandtPeter BrandtSunke SchmidtkoFilomena Vaz VelhoMarek OstrowskiFrontiers Media S.A.articlesoutheastern tropical Atlantic Oceandecadal variabilityupper-ocean stratification increasemixed layer warming and fresheningheave and spice anomaliesprimary productivityScienceQGeneral. Including nature conservation, geographical distributionQH1-199.5ENFrontiers in Marine Science, Vol 8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	southeastern tropical Atlantic Ocean decadal variability upper-ocean stratification increase mixed layer warming and freshening heave and spice anomalies primary productivity Science Q General. Including nature conservation, geographical distribution QH1-199.5
spellingShingle	southeastern tropical Atlantic Ocean decadal variability upper-ocean stratification increase mixed layer warming and freshening heave and spice anomalies primary productivity Science Q General. Including nature conservation, geographical distribution QH1-199.5 Marisa Roch Peter Brandt Peter Brandt Sunke Schmidtko Filomena Vaz Velho Marek Ostrowski Southeastern Tropical Atlantic Changing From Subtropical to Tropical Conditions
description	A warming and freshening trend of the mixed layer in the upper southeastern tropical Atlantic Ocean (SETA) is observed by the Argo float array during the time period of 2006–2020. The associated ocean surface density reduction impacts upper-ocean stratification that intensified by more than 30% in the SETA region since 2006. The initial typical subtropical stratification with a surface salinity maximum is shifting to more tropical conditions characterized by warmer and fresher surface waters and a subsurface salinity maximum. During the same period isopycnal surfaces in the upper 200 m are shoaling continuously. Observed wind stress changes reveal that open ocean wind curl-driven upwelling increased, however, partly counteracted by reduced coastal upwelling due to weakened alongshore southerly winds. Weakening southerly winds might be a reason why tropical surface waters spread more southward reaching further into the SETA region. The mixed layer warming and freshening and associated stratification changes might impact the marine ecosystem and pelagic fisheries in the Angolan and northern Namibian upwelling region.
format	article
author	Marisa Roch Peter Brandt Peter Brandt Sunke Schmidtko Filomena Vaz Velho Marek Ostrowski
author_facet	Marisa Roch Peter Brandt Peter Brandt Sunke Schmidtko Filomena Vaz Velho Marek Ostrowski
author_sort	Marisa Roch
title	Southeastern Tropical Atlantic Changing From Subtropical to Tropical Conditions
title_short	Southeastern Tropical Atlantic Changing From Subtropical to Tropical Conditions
title_full	Southeastern Tropical Atlantic Changing From Subtropical to Tropical Conditions
title_fullStr	Southeastern Tropical Atlantic Changing From Subtropical to Tropical Conditions
title_full_unstemmed	Southeastern Tropical Atlantic Changing From Subtropical to Tropical Conditions
title_sort	southeastern tropical atlantic changing from subtropical to tropical conditions
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/e7ac25164c7842f485dccea290fb5170
work_keys_str_mv	AT marisaroch southeasterntropicalatlanticchangingfromsubtropicaltotropicalconditions AT peterbrandt southeasterntropicalatlanticchangingfromsubtropicaltotropicalconditions AT peterbrandt southeasterntropicalatlanticchangingfromsubtropicaltotropicalconditions AT sunkeschmidtko southeasterntropicalatlanticchangingfromsubtropicaltotropicalconditions AT filomenavazvelho southeasterntropicalatlanticchangingfromsubtropicaltotropicalconditions AT marekostrowski southeasterntropicalatlanticchangingfromsubtropicaltotropicalconditions
_version_	1718405449249718272

Southeastern Tropical Atlantic Changing From Subtropical to Tropical Conditions

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