The Lofoten Vortex of the Nordic Seas

Raj, Roshin P.; Chafik, Léon; Nilsen, Jan Even Øie; Eldevik, Tor; Halo, Issufo

doi:10.1016/j.dsr.2014.10.011

Cited by 59 publications

(101 citation statements)

References 42 publications

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“…The performance of the hybrid eddy detection algorithm used in our study (Halo 2012;Halo et al 2014) has been tested successfully in the Lofoten Basin (Raj et al 2015). Eddy detection in the Lofoten Basin using this method has also been validated using Argo floats and surface drifters (Raj et al 2016).…”

Section: Eddy Detection Methodsmentioning

confidence: 98%

“…Köhl 2007;Rossby, Prater, and Søiland 2009). According to the current understanding, heat is transported into the Lofoten Basin from the Norwegian Atlantic Current via mesoscale eddies since there is no mean flow into the basin Raj et al 2015). This heat transport by eddies balances the large heat loss in the Lofoten Basin (Rossby, Prater, and Søiland 2009) mentioned above.…”

Section: Introductionmentioning

confidence: 99%

“…One of the most extensively studied mesoscale features in the Lofoten Basin is the Lofoten Vortex Korablev 1995a, 1995b;Köhl 2007;Rossby, Prater, and Søiland 2009;Koszalka et al 2011;Søiland and Rossby 2013;Volkov, Belonenko, and Foux 2013;Volkov, Kubryakov, and Lumpkin 2015;Raj et al 2015). This energetic, quasi-permanent anticyclonic eddy resides in the deep western part of the Lofoten Basin and is sustained mainly due to the energy transfer from eddy mergers.…”

Section: Introductionmentioning

confidence: 99%

“…Chelton et al 2007;Chelton, Schlax, and Samelson 2011). One of these automated techniques has been effectively used in the Lofoten Basin to study mesoscale eddies (Raj et al 2015). A brief discussion of available eddy detection techniques is provided in Section 3.…”

Section: Introductionmentioning

confidence: 99%

“…One of the main data sets used in the detection of Lofoten Basin eddies is the weekly data (AVISO10) provided by AVISO (Archiving, Validation and Interpretation of Satellite Oceanographic data; e.g. Volkov, Belonenko, and Foux 2013;Volkov, Kubryakov, and Lumpkin 2015;Raj et al 2015). Recently AVISO centre carried out a complete reprocessing of the SLA data set (AVISO14; Duacs/AVISO 2014) and a daily data set is provided, using which Capet et al (2014) found improvement in the detection of eddies in the tropics and subtropics.…”

Section: Introductionmentioning

confidence: 99%

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Monitoring the mesoscale eddies of the Lofoten Basin: importance, progress, and challenges

Raj¹,

Halo

2016

International Journal of Remote Sensing

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The Lofoten Basin is a 'hot spot' of intense mesoscale eddy activity in the Nordic Seas. The mesoscale eddies of the Lofoten Basin can be coupled to the heat transport, local climate, and fisheries of the region. During the past two decades, the European satellite missions European Remote Sensing (ERS) satellite and Environmental Satellite (ENVISAT) have played a major part in delivering continuous altimeter measurements over the Lofoten Basin. In recent years, automated eddy detection and tracking methods have revolutionized the long-term monitoring of eddies in the Lofoten Basin from the gridded altimeter data.

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Section: Eddy Detection Methodsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Monitoring the mesoscale eddies of the Lofoten Basin: importance, progress, and challenges

Raj¹,

Halo

2016

International Journal of Remote Sensing

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Baroclinic instability and the mesoscale eddy field around the Lofoten Basin

Isachsen

2015

JGR Oceans

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The vigorous mesoscale eddy field around the Lofoten Basin west of northern Norway is thought to be related to eddy shedding from the Norwegian Atlantic Current flowing along the Norwegian coast. Here we study baroclinic instability in the current with a particular focus on the influence of topography. The flow over the steepest part of the continental slope is found to be the most unstable. The growth characteristics cannot be understood from Eady theory alone but require the consideration of interior potential vorticity gradients. A study of the fully developed macroturbulent field shows that eddy kinetic energy is advected away from the generation regions and that nonlinear effects likely draw the eddy statistics away from the linear growth regime.

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On the flow of Atlantic water and temperature anomalies in the Nordic Seas toward the Arctic Ocean

et al. 2015

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The climatic conditions over the Arctic Ocean are strongly influenced by the inflow of warm Atlantic water conveyed by the Norwegian Atlantic Slope Current (NwASC). Based on sea surface height (SSH) data from altimetry, we develop a simple dynamical measure of the NwASC transport to diagnose its spatio‐temporal variability. This supports a dynamical division of the NwASC into two flow regimes; the Svinøy Branch (SvB) in the southern Norwegian Sea, and the Fram Strait Branch (FSB) west of Spitsbergen. The SvB transport is well correlated with the SSH and atmospheric variability within the Nordic Seas, factors that also affect the inflow to the Barents Sea. In contrast, the FSB is influenced by regional atmospheric conditions around Svalbard and northern Barents Sea. Using a composite analysis, we further relate anomalous strong SvB flow events to temperature fluctuations along the core of Atlantic water. A warm composite anomaly is found to propagate northward, with a tendency to amplify enroute, after these events. A roughly 12 months delayed temperature signal is identified in the FSB. However, also in the Lofoten Basin interior a delayed temperature signal is found, which appears to originate from the NwASC. This study suggests that hydrographic anomalies both upstream from the North Atlantic, and locally generated in the Norwegian Sea, are important for the oceanic heat and salt transport that eventually enters into the Arctic.

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The Lofoten Vortex of the Nordic Seas

Cited by 59 publications

References 42 publications

Monitoring the mesoscale eddies of the Lofoten Basin: importance, progress, and challenges

Monitoring the mesoscale eddies of the Lofoten Basin: importance, progress, and challenges

Baroclinic instability and the mesoscale eddy field around the Lofoten Basin

On the flow of Atlantic water and temperature anomalies in the Nordic Seas toward the Arctic Ocean

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