Water mass pathways to the North Atlantic Oxygen Minimum Zone
2nd International Ocean Research Conference, One planet one ocean, 17-21 November 2014, Barcelona, Spain Oxygen Minimum Zones (OMZ's) are considered in the classical theory of wind-driven circulation isolated from the subtropical gyres ventilation, i.e. no direct supply of water occurs from the...
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ftcsic:oai:digital.csic.es:10261/125231 2024-02-11T10:06:08+01:00 Water mass pathways to the North Atlantic Oxygen Minimum Zone Peña-Izquierdo, Jesús van Sebille, E. Pelegrí, Josep Lluís Sprintall, J. Mason, Evan Llanillo, P. J. 2014-11-18 http://hdl.handle.net/10261/125231 unknown http://www.iocunesco-oneplanetoneocean.fnob.org/ Sí 2nd International Ocean Research Conference (2014) http://hdl.handle.net/10261/125231 none comunicación de congreso http://purl.org/coar/resource_type/c_5794 2014 ftcsic 2024-01-16T10:12:02Z 2nd International Ocean Research Conference, One planet one ocean, 17-21 November 2014, Barcelona, Spain Oxygen Minimum Zones (OMZ's) are considered in the classical theory of wind-driven circulation isolated from the subtropical gyres ventilation, i.e. no direct supply of water occurs from the gyres. Hence, the ventilation of the OMZ's is traditionally explained within the circulation of the tropical system of zonal jets. However, historical observations show an abrupt thermohaline transition at 300m of depth (σ0= 26.8 kg/m3) in the North Atlantic OMZ. We show that there are 2 well-differentiated water mass strata within Central Waters (CW). The upper layer (above s26.8) is dominated by South Atlantic CW which extends throughout the whole Tropical Atlantic. The lower layer instead shows a marked increase of North Atlantic CW. Indeed, the contribution of northern gyre CW is maximal (50%) at the core of the OMZ (at s27.1). According with these observations, a Lagrangian numerical simulation shows remarkably distinct pathways for both layers. In the upper layer and in agreement with previous studies, the northward branching from the North Equatorial CounterCurrent at 9N is the main water supply of the OMZ mostly with southern origin lagrangian particles. However this pathway is notably reduced in the lower layer. Below s26.8, most of the water supply occurs north of 10N, mainly via eastward jets at 14N and 18N with an increased contribution of northern origin particles. The water mass exchange from the northern subtropical gyre emerges as an essential part in the ventilation of the North Atlantic OMZ Peer Reviewed Conference Object North Atlantic Digital.CSIC (Spanish National Research Council) |
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Digital.CSIC (Spanish National Research Council) |
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unknown |
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2nd International Ocean Research Conference, One planet one ocean, 17-21 November 2014, Barcelona, Spain Oxygen Minimum Zones (OMZ's) are considered in the classical theory of wind-driven circulation isolated from the subtropical gyres ventilation, i.e. no direct supply of water occurs from the gyres. Hence, the ventilation of the OMZ's is traditionally explained within the circulation of the tropical system of zonal jets. However, historical observations show an abrupt thermohaline transition at 300m of depth (σ0= 26.8 kg/m3) in the North Atlantic OMZ. We show that there are 2 well-differentiated water mass strata within Central Waters (CW). The upper layer (above s26.8) is dominated by South Atlantic CW which extends throughout the whole Tropical Atlantic. The lower layer instead shows a marked increase of North Atlantic CW. Indeed, the contribution of northern gyre CW is maximal (50%) at the core of the OMZ (at s27.1). According with these observations, a Lagrangian numerical simulation shows remarkably distinct pathways for both layers. In the upper layer and in agreement with previous studies, the northward branching from the North Equatorial CounterCurrent at 9N is the main water supply of the OMZ mostly with southern origin lagrangian particles. However this pathway is notably reduced in the lower layer. Below s26.8, most of the water supply occurs north of 10N, mainly via eastward jets at 14N and 18N with an increased contribution of northern origin particles. The water mass exchange from the northern subtropical gyre emerges as an essential part in the ventilation of the North Atlantic OMZ Peer Reviewed |
format |
Conference Object |
author |
Peña-Izquierdo, Jesús van Sebille, E. Pelegrí, Josep Lluís Sprintall, J. Mason, Evan Llanillo, P. J. |
spellingShingle |
Peña-Izquierdo, Jesús van Sebille, E. Pelegrí, Josep Lluís Sprintall, J. Mason, Evan Llanillo, P. J. Water mass pathways to the North Atlantic Oxygen Minimum Zone |
author_facet |
Peña-Izquierdo, Jesús van Sebille, E. Pelegrí, Josep Lluís Sprintall, J. Mason, Evan Llanillo, P. J. |
author_sort |
Peña-Izquierdo, Jesús |
title |
Water mass pathways to the North Atlantic Oxygen Minimum Zone |
title_short |
Water mass pathways to the North Atlantic Oxygen Minimum Zone |
title_full |
Water mass pathways to the North Atlantic Oxygen Minimum Zone |
title_fullStr |
Water mass pathways to the North Atlantic Oxygen Minimum Zone |
title_full_unstemmed |
Water mass pathways to the North Atlantic Oxygen Minimum Zone |
title_sort |
water mass pathways to the north atlantic oxygen minimum zone |
publishDate |
2014 |
url |
http://hdl.handle.net/10261/125231 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
http://www.iocunesco-oneplanetoneocean.fnob.org/ Sí 2nd International Ocean Research Conference (2014) http://hdl.handle.net/10261/125231 |
op_rights |
none |
_version_ |
1790603630602092544 |