Anticyclonic eddies in the Norwegian Sea; their generation, evolution and impact on primary production

Hansen, Cecilie; Kvaleberg, E.; Samuelsen, Annette

doi:10.1016/j.dsr.2010.05.013

Cited by 38 publications

(30 citation statements)

References 44 publications

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“…Kostianoy and Belkin, 1989;McGillicuddy et al, 1998), seas (e.g. Gordon et al, 2002;Hansen et al, 2010), and in EBCs (e.g. Jeró-nimo and Gómez-Valdés, 2007;Johnson and McTaggart, 2010;Chaigneau et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

“…Eddies are a recurrent mesoscale feature in EBCs (Capet et al, 2008;Paterson et al, 2008;Chaigneau et al, 2009Chaigneau et al, , 2011Sangrà et al, 2009;Johnson and McTaggart, 2010;Colas et al, 2011) and in the oceans in general (Lee and Williams, 2000;Hansen et al, 2010;Chelton et al, 2011); they can be surface or subsurface in nature. In surface eddies, the depth of the seasonal thermocline is vertically displaced compared with the surrounding waters, upwards at the center of cyclonic eddies and downwards at the center of anticyclonic eddies (McGillicuddy et al, 1998).…”

Section: Introductionmentioning

confidence: 99%

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Mesoscale variability and nutrient–phytoplankton distributions off central-southern Chile during the upwelling season: The influence of mesoscale eddies

Morales

Hormazábal

Correa-Ramírez

et al. 2012

Progress in Oceanography

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mesoscale variability and nutrient–phytoplankton distributions off central-southern Chile during the upwelling season: The influence of mesoscale eddies

Morales

Hormazábal

Correa-Ramírez

et al. 2012

Progress in Oceanography

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“…The latter condition can arise due to isopycnal rebound that accompanies the frictional decay of anticyclonic mesoscale eddies (Fukumori 1992). This mechanism injects nutrients into the waters above, and may explain the enhanced biological production often observed in anticyclonic (or downwelling) eddies (Hansen et al 2010). The process is illustrated schematically in Fig.…”

Section: General Trendsmentioning

confidence: 99%

Evolution of the phytoplankton assemblage in a long-lived mesoscale eddy in the eastern Gulf of Alaska

Peterson¹,

Crawford²,

Harrison³

2011

Mar. Ecol. Prog. Ser.

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We tracked changes in the phytoplankton species composition in an anticyclonic mesoscale eddy (Haida-2000a) in the eastern Gulf of Alaska (GOA) 4 times over a 20 mo period as it propagated westward away from the coast and into high-nitrate, low-chlorophyll waters. Phytoplankton species diversity in the eddy was higher in late summer/early autumn (September) than in spring (June) and it declined between the first and second years of evolution. Phytoplankton diversity within the eddy was greater than in the surrounding area in September (but not in June) in both the first and second years of evolution. Small cells dominated the phytoplankton assemblages throughout the study at all sites. The prevalence of coastal species in the eddy and its surroundings declined between the first and second years of eddy evolution. During the same period, the contribution of haptophytes and pelagophytes increased. Haida-2000a had a lower abundance of diatoms than its surroundings after one year of evolution, possibly due to the preferential export of silica from the eddy. Pigment and phytoplankton distributions indicated that edge sites differed from the center and outside, either due to the advective entrainment of surrounding waters into eddy circulation, or as a consequence of local upwelling at the eddy margins. The data suggest that eddies may respond differently than surrounding waters to external forcing, including storms and iron deposition events, thereby contributing to variability and large-scale patchiness of phytoplankton populations observed in the GOA.

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“…It has been observed that the composition of phytoplankton inside the ITEs is dominated by phytoplankton classes of large size (>20 μm), mostly diatoms, as in the ITEs of northwest Atlantic Ocean (mode-water eddy; McGillicuddy et al, 2007), the East Sea of Japan (UWE; Kim et al, 2011) and the Sea of Norway (Hansen et al, 2010). However, in the southeastern Pacific ITEs, a predominance of smaller phytoplankton: nanophytoplankton (between 20-3 μm in diameter) has been observed .…”

Section: Discussionmentioning

confidence: 96%

Intrathermocline eddies at the Juan Fernandez Archipelago, southeastern Pacific Ocean

Andrade

Hormazábal

Combes

2014

lajar

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ABSTRACT. Regional Ocean Modeling System (ROMS) results, combined with chlorophyll-a (Chl-a) and satellite altimetry information as well as information from oceanographic cruises were analyzed to identify interactions between intrathermocline eddies (ITEs) and the Juan Fernández Archipelago (JFA), and discuss their potential impact on surface Chl-a concentrations. The JFA is located off the coast of central Chile (33°S), and is composed of three main islands: Robinson Crusoe (RC), Alejandro Selkirk (AS) and Santa Clara (SC). Results indicate that the surface and subsurface anticyclonic eddies that interact with the JFA are formed primarily within the coastal transition zone between 33° and 39°S. ITEs are present within the JFA region with a semiannual frequency, mainly during the austral autumn, and have a weak surface expression in relation to the adjacent surface eddies, with a slow displacement (1.16 to 1.4 km d -1 ) in a northwest direction and a coherent structure for periods of ≥1 year. During the ITEs' interaction with RC-SC islands and an adjacent seamount, a slight (prominent) thermocline deflection of the upper limit (lower) was observed. The horizontal extent (~70-100 km) was greater than the internal Rossby deformation radius and the average vertical extent was ~400 m. The interaction between the weak surface expression of ITEs, identified with satellite altimetry, and the JFA persisted during autumn for nine weeks until reaching the winter period. Approximately one month after the beginning of the interaction between ITEs and the islands, increases in surface Chl-a associated with the eddy were observed, with values up to three times higher than adjacent oceanic waters. Keywords: intrathermocline eddies, Juan Fernández Archipelago, southeastern Pacific Ocean. Remolinos intratermoclina en el Archipiélago Juan Fernández,Océano Pacífico suroriental RESUMEN. Se analizaron los resultados de un modelo oceánico regional (ROMS), combinado con información de clorofila-a (Clo-a) y altimetría satelital, además de información proveniente de cruceros oceanográficos, para identificar la interacción entre los remolinos intratermoclina (ITEs) y el Archipiélago Juan Fernández (AJF), y discutir su potencial impacto sobre las concentraciones de Clo-a superficial. El AJF se encuentra ubicado frente a la costa central de Chile (33°S), y está conformado por las islas Robinson Crusoe, Santa Clara y Alejandro Selkirk. Los resultados indican que los remolinos anticiclónicos superficiales y subsuperficiales que interactúan con el AJF se forman principalmente en la zona de transición costera entre 33° y 39°S. Los ITEs se presentan en la región del AJF con una frecuencia semianual, principalmente durante el período de otoño austral, y poseen una débil expresión superficial respecto de los remolinos superficiales adyacentes, un lento desplazamiento (1,16-1,4 km d -1) con dirección noroeste y una estructura coherente por períodos ≥1 año. Durante la interacción de los ITEs con las islas RC-SC y el monte submarino adyacente, se ob...

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Anticyclonic eddies in the Norwegian Sea; their generation, evolution and impact on primary production

Cited by 38 publications

References 44 publications

Mesoscale variability and nutrient–phytoplankton distributions off central-southern Chile during the upwelling season: The influence of mesoscale eddies

Mesoscale variability and nutrient–phytoplankton distributions off central-southern Chile during the upwelling season: The influence of mesoscale eddies

Evolution of the phytoplankton assemblage in a long-lived mesoscale eddy in the eastern Gulf of Alaska

Intrathermocline eddies at the Juan Fernandez Archipelago, southeastern Pacific Ocean

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