Recirculation of the Canary Current in fall 2014

Hernández‐Guerra, Alonso; Espino-Falcón, Elisabet; Vélez‐Belchí, P.; Pérez‐Hernández, M. Dolores; Martínez-Marrero, Antonio; Cana, L.

doi:10.1016/j.jmarsys.2017.04.002

Cited by 24 publications

(33 citation statements)

References 46 publications

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“…The COCA-I and COCA-II cruises were carried out in fall (10 September to 1 October 2002) and spring (21 May to 7 June 2003), respectively, aboard the BIO Hesperides as part of the research project Coastal-Ocean Carbon Exchange in the Canary Region (Hernández-León et al, 2019). The location of conductivity-temperature-depth (CTD), inorganic nutrient (IN) and dissolved organic carbon (DOC) stations in COCA-I and COCA-II defines a closed box along three transects (Fig.…”

Section: Datasetmentioning

confidence: 99%

“…3 and Table 2). Below, from 700 up to 1300 m (27.38 < γ n < 27.82 kg m −3 ), the intermediate waters AAIW and MW are the dominant water masses (Hernández-Guerra et al, 2017). MW is a relatively warm and salty water mass, while AAIW is colder and fresher (Table 2).…”

Section: Hydrography and Water Massesmentioning

confidence: 99%

“…An inverse box model is applied to the hydrographic data from the two COCA cruises to provide the absolute velocity field across the three sections (Wunsch, 1978). This method has been widely applied in different areas of the Atlantic Ocean as an efficient method to obtain absolute geostrophic flows (Martel and Wunsch, 1993;Paillet and Mercier, 1997;Ganachaud, 2003a;Machín et al, 2006;Pérez-Hernández et al, 2013;Hernández-Guerra et al, 2017;Fu et al, 2018). Assuming geostrophy and the conservation of mass and other properties in the ocean bounded by the African coast and the hydrological sections, the velocity fields are obtained, allow- ing for an adjustment of freshwater flux and Ekman transports.…”

Section: The Inverse Modelmentioning

confidence: 99%

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Mass, nutrients and dissolved organic carbon (DOC) lateral transports off northwest Africa during fall 2002 and spring 2003

et al. 2020

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Abstract. The circulation patterns and the impact of the lateral export of nutrients and organic matter off NW Africa are examined by applying an inverse model to two hydrographic datasets gathered in fall 2002 and spring 2003. These estimates show significant changes in the circulation patterns at central levels from fall to spring, particularly in the southern boundary of the domain related to zonal shifts of the Cape Verde Frontal Zone. Southward transports at the surface and central levels at 26∘ N are 5.6±1.9 Sv in fall and increase to 6.7±1.6 Sv in spring; westward transports at 26∘ W are 6.0±1.8 Sv in fall and weaken to 4.0±1.8 Sv in spring. At 21∘ N a remarkable temporal variability is obtained, with a northward mass transport of 4.4±1.5 Sv in fall and a southward transport of 5.2±1.6 Sv in spring. At intermediate levels important spatiotemporal differences are also observed, and it must be highlighted that a northward net mass transport of 2.0±1.9 Sv is obtained in fall at both the south and north transects. The variability in the circulation patterns is also reflected in lateral transports of inorganic nutrients (SiO2, NO3, PO4) and dissolved organic carbon (DOC). Hence, in fall the area acts as a sink of inorganic nutrients and a source of DOC, while in spring it reverses to a source of inorganic nutrients and a sink of DOC. A comparison between nutrient fluxes from both in situ observations and numerical modeling output is finally addressed.

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Section: Datasetmentioning

confidence: 99%

Section: Hydrography and Water Massesmentioning

confidence: 99%

Section: The Inverse Modelmentioning

confidence: 99%

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Mass, nutrients and dissolved organic carbon (DOC) lateral transports off northwest Africa during fall 2002 and spring 2003

et al. 2020

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“…An inverse box model is applied to the hydrographic data of the two COCA cruises to provide the absolute velocity field across the three sections (Wunsch, 1978). This method has been widely applied in different areas of the Atlantic Ocean as an efficient method to obtain absolute geostrophic flows (Martel and Wunsch, 1993;Paillet and Mercier, 1997;Ganachaud, 2003a;Machín et al, 2006;Pérez-Hernández et al, 2013;Hernández-Guerra et al, 2017;Fu et al, 2018). Assuming geostrophy and the conservation of mass and other properties in the ocean bounded by the African coast and the hydrological sections, the velocity fields are obtained allowing an adjustment of freshwater flux and Ekman transports.…”

Section: The Inverse Modelmentioning

confidence: 99%

“…This method provides a velocity field consistent with both mass and properties conservation within a closed volume and with the thermal wind equation (Wunsch, 1996). Several authors have already described the circulation patterns of the NASG by applying an inverse model (Ganachaud and Wunsch, 2002a;Ganachaud, 2003b, a;Hernández-Guerra et al, 2005;Machín et al, 2006;Pérez-Hernández et al, 2013;Hernández-Guerra et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Seasonal variability in mass, nutrients and DOC lateral transports off Northwest African Upwelling System

Burgoa

Machín

Marrero-Díaz

et al. 2019

Preprint

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Abstract. The Coastal-Ocean Carbon Exchange in the Canary Region Project (COCA) arises in order to analyse and get to understand the impact of lateral export of nutrients and organic matter from the highly productive Coastal Upwelling System off NW Africa in the biogeochemical cycles during two different seasons. The circulation patterns off NW African Upwelling System are examined by applying an inverse model to two hydrographic datasets gathered in fall 2002 and spring 2003. The mass transports estimated by model are consistent with the thermal wind equation and the conservation of mass in a closed volume. Besides, the Ekman transport and the freshwater flux are also considered. These estimates show a seasonal variability in the circulation patterns at central levels, particularly in the southern boundary of the domain, where the Cape Verde Frontal Zone is located. In the beginning of fall, this circulation is deeper and northward with a net transport of 6 ± 3 Sv and, in the late spring, it is shallower and southward with a similar intensity. At intermediate levels important differences are also observed between the two seasons. In fall, the Antarctic Intermediate Waters reaches higher latitudes with 2 ± 2 Sv flowing northward. During spring, there is no significant northward flow of AAIW. However, there is a moderate westward mass transport which impacts both the lateral transports of inorganic nutrients and organic matter at intermediate layers and also the shallowest lateral transports of organic matter. Seasonal variability in circulation patterns are also reflected in lateral transports of inorganic nutrients and dissolved organic carbon. Therefore, the changes in the circulation patterns between the two seasons have allowed us to assess the variability in the contributions of SiO2, NO3, PO4 and DOC from the first to the second season. In fall, the transports are mainly northward from the south with −0.80 ± 0.34, −1.11 ± 0.47 and −0.07 ± 0.03 kmol s-1 of SiO2, NO3 and PO4, respectively. In spring, however, lateral transports off-shore are favoured with 0.75 ± 0.37, 1.34 ± 0.66 and 0.08 ± 0.04 kmol s-1 of SiO2, NO3 and PO4, respectively. This westward transport stimulates in turn an intensified westward DOC transport at shallow layers, specifically 0.50 ± 0.25 x 108 mol C day-1.

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On the Seasonal variability in the eastern boundary of the North Atlantic Subtropical Gyre

Pérez‐Hernández

Hernández‐Guerra

Cana‐Cascallar

et al. 2022

Preprint

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Recirculation of the Canary Current in fall 2014

Cited by 24 publications

References 46 publications

Mass, nutrients and dissolved organic carbon (DOC) lateral transports off northwest Africa during fall 2002 and spring 2003

Mass, nutrients and dissolved organic carbon (DOC) lateral transports off northwest Africa during fall 2002 and spring 2003

Seasonal variability in mass, nutrients and DOC lateral transports off Northwest African Upwelling System

On the Seasonal variability in the eastern boundary of the North Atlantic Subtropical Gyre

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