Three anticyclonic slope water oceanic eDDIES (SWODDIES) in the Southern Bay of Biscay in 1990

Pingree, R. D.; Cann, Bernard Le

doi:10.1016/0198-0149(92)90062-x

Cited by 250 publications

(211 citation statements)

References 23 publications

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“…4 The next is the dipolar vortex 5 which consists of two closely packed regions of opposite vorticity ͑i.e., two monopolar vortices͒. Also a tripolar vortex 6 is found to exist. It consists of an elliptically shaped core vortex with two satellites of opposite vorticity.…”

Section: Introductionmentioning

confidence: 84%

On the interaction between two oppositely signed, shielded, monopolar vortices

et al. 1998

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The formation two-dimensional dipolar vortices by the interaction between two shielded monopolar vortices with opposite vorticity, as shown in a numerical study by Couder and Basdevant, 1 is investigated in detail, both experimentally, in a nonrotating stratified fluid and numerically by direct solutions of the two-dimensional Navier-Stokes equations. A comparative study between the laboratory experiments and numerical simulations is performed. The vorticity distribution measured in the early stage of the evolution in the laboratory is used as initial data for the simulations, and an additional damping term in the Navier-Stokes equations, that accounts for the vertical diffusion in the laboratory experiments, is used. The results show that, depending on the initial separation between the vortices, the shields of the monopoles are peeled off and indeed a compact dipole with a linear ͑ , ͒-relationship is formed, or when the monopoles are further apart the shields of the monopoles are perturbed and two tripoles are formed. The characteristics of the emerged dipole are analyzed and a dye visualization of the dipole formation is performed. A second, more general numerical study yields a relationship between the formation time of the dipole and the initial separation distance between the monopoles and it shows that the deshielding process can be explained by the domination of strain over vorticity.

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Section: Introductionmentioning

confidence: 84%

On the interaction between two oppositely signed, shielded, monopolar vortices

et al. 1998

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“…18 Setting the reference level to 700 dbar over the whole domain resulted in a more 19 realistic flow structure. Although it is true that the velocity probably does not completely 20 vanish at that level, the fact that velocity values are much smaller than at upper levels makes 21 that the impact of not exactly fulfilling that assumption is smaller than when assuming no …”

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confidence: 97%

“…8b). It is 20 worth noting that the ageostrophic velocity is mostly meridional along this section, so that the 21 vectors represented in Fig. 8b practically account for the whole ageostrophic circulation.…”

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confidence: 99%

“…The value of the best fit was obtained for S=10 km; sensitivity 19 tests showed that results were not significantly influenced by the choice of this parameter 20 provided it was kept within reasonable limits (7-15 km). An additional normal-error filter 21 convolution was also applied in the way proposed by Pedder (1993), in order to filter out scales 22 which can not be resolved by the sampling. In our case, the cut-off wavelength ( c ) was set to 23 40 km (twice the separation distance between transects and four times the separation distance 24 along transects).…”

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confidence: 99%

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The secondary ageostrophic circulation in the Iberian Poleward Current along the Cantabrian Sea (Bay of Biscay)

Gil¹,

Gomis²

2008

Journal of Marine Systems

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“…Topographic forcing or frontal instabilities cause transient cold water filaments to extend up to 200 km from the upwelling zone into the deeper ocean (Haynes et al, 1993). Mesoscale eddies may form along the continental slope and influence local circulation and mixing; if they detach as a slope-water oceanic eddy (Swoddy) they can transport their physical properties over thousands of kilometres and many months (Pingree and Lecann, 1992).…”

Section: Analysis Of Iberian Peninsula Dynamicsmentioning

confidence: 99%

Composite front maps for improved visibility of dynamic sea-surface features on cloudy SeaWiFS and AVHRR data

Miller

2009

Journal of Marine Systems

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Novel techniques have been developed for increasing the value of cloud-affected sequences of Advanced Very High Resolution Radiometer (AVHRR) sea-surface temperature (SST) data and Seaviewing Wide Field-of-view Sensor (SeaWiFS) ocean colour data for visualising dynamic physical and biological oceanic processes such as fronts, eddies and blooms. The proposed composite front map approach is to combine the location, strength and persistence of all fronts observed over several days into a single map, which allows intuitive interpretation of mesoscale structures. This method achieves a synoptic view without blurring dynamic features, an inherent problem with conventional time-averaging compositing methods. Objective validation confirms a significant improvement in feature visibility on composite maps compared to individual front maps. A further novel aspect is the automated detection of ocean colour fronts, correctly locating 96% of chlorophyll fronts in a test data set. A sizeable data set of 13,000 AVHRR and 1,200 SeaWiFS scenes automatically processed using this technique is applied to the study of dynamic processes off the Iberian Peninsula such as mesoscale eddy generation, and many additional applications are identified. Front map animations provide a unique insight into the evolution of upwelling and eddies.

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Three anticyclonic slope water oceanic eDDIES (SWODDIES) in the Southern Bay of Biscay in 1990

Cited by 250 publications

References 23 publications

On the interaction between two oppositely signed, shielded, monopolar vortices

On the interaction between two oppositely signed, shielded, monopolar vortices

The secondary ageostrophic circulation in the Iberian Poleward Current along the Cantabrian Sea (Bay of Biscay)

Composite front maps for improved visibility of dynamic sea-surface features on cloudy SeaWiFS and AVHRR data

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