Lagrangian characterization of the southwestern Atlantic from a dense surface drifter deployment

Saraceno, M.; Bodnariuk, N.; Ruiz-Etcheverry, L.A.; Berta, M.; Simionato, C.G.; Beron-Vera, F.J.; Olascoaga, M.J.

doi:10.1016/j.dsr.2024.104319

Cited by 3 publications

(2 citation statements)

References 56 publications

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“…The spatial organization of the drifters after deployment is largely due to mesoscale motions resolved by satellite altimetry, as shown Figure 1 (Saraceno et al, 2024). We here uncover the effects on the drifters of two long-lived mesoscale coherent Lagrangian eddies.…”

Section: Coherent Lagrangian Eddy Motions In the Altimetry Data Setmentioning

confidence: 55%

“…The custom drifters were not equipped with that capability, requiring the trajectory data to undergo a quality control process to determine drogue presence, which followed the methodology described in Lumpkin et al (2012). No trajectory segments corresponding to drifters that lost their drogues are considered in the analysis, as their motion can be expected to be influenced by wind and wave-induced slippage (Saraceno et al, 2024).…”

Section: Driftersmentioning

confidence: 99%

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Multiple Lagrangian Jet‐Core Structures in the Malvinas Current

Bodnariuk,

Saraceno,

Ruiz‐Etcheverry

et al. 2024

JGR Oceans

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The Malvinas Current (MC) in the Southwestern Atlantic is characterized as a system of multiple Lagrangian jets. This is done by applying geodesic theory of Lagrangian Coherent Structures (LCSs) on altimetry‐derived velocity. The number and spatial disposition of jet‐cores organizing the MC are found to vary in time influenced by topographic waves propagating along the current. The Lagrangian analysis reveals that permanent jet‐cores tend to approach one another upstream, yet do not merge into a single jet as the Eulerian analysis of the data suggests. Independent support for the existence of multiple jets is provided by trajectories of surface drifters from a deployment of unparalleled dimensions for the region and ocean color images. The drifters develop the characteristic boomerang‐shaped patterns into which passive tracers straddling jet‐cores deform and exhibit Lagrangian metrics that are largely consistent with those derived from altimetry data. Ocean color imagery reveals similar “chevrons” and suggest upwelling along the jets, which is consistent with a new solution of arrested topographic wave dynamics. This observation and the finding that the MC jet system is influenced by propagating waves suggests that the MC variability may have major implications in the modulation of primary productivity on synoptic timescales. Drifters flowing into the open ocean, exhibit organizing patterns that are largely shaped by mesoscale circulation and essentially differ from those observed along the MC. Evidence of this observation is provided on the basis of LCS analysis and the calculation of a quasi‐objective Lagrangian metric derived directly from drifter trajectories.

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Section: Coherent Lagrangian Eddy Motions In the Altimetry Data Setmentioning

confidence: 55%

Section: Driftersmentioning

confidence: 99%

Multiple Lagrangian Jet‐Core Structures in the Malvinas Current

Bodnariuk,

Saraceno,

Ruiz‐Etcheverry

et al. 2024

JGR Oceans

Self Cite

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Anatomy and Dynamics of the Patagonia Shelf-Break Front

Piola,

Bodnariuk,

Combes

et al. 2024

Aquatic Ecology Series

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Evaluation of the sub-annual sea level anomalies in the continental shelf of the Southwestern Atlantic and their relation to wind variability

Juhl,

Passaro,

Dettmering

et al. 2024

Ocean Dynamics

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We have analyzed the relationship between wind variability and sea level anomalies (SLA) on the Southwestern Atlantic Continental Shelf, focusing on sub-annual temporal scales. For this, we tested the capability of gridded altimetry to represent wind-driven SLA and compared results using an oceanographic model and tide gauge data. The present study used coherence analysis to analyze frequencies for which SLA and wind stress are coherent. The altimetry-SLA were found to have less energy below the three-month period compared to the model SLA. The coherence of along-shore wind stress and altimetry SLA was only significant for > 50 days (d), while the model SLA showed significant agreement in all periods considered, 20 d to annual. We further showed that geostrophic velocities on the continental shelf agreed significantly with SLA for > 50 d. As a result of an Empirical Orthogonal Function (EOF) analysis, we found that the second mode is highly coherent with the along-shore wind stress and accounts for 18.1% and 10.7% of variability in the model and altimetry sea level anomalies, respectively.

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Lagrangian characterization of the southwestern Atlantic from a dense surface drifter deployment

Cited by 3 publications

References 56 publications

Multiple Lagrangian Jet‐Core Structures in the Malvinas Current

Multiple Lagrangian Jet‐Core Structures in the Malvinas Current

Anatomy and Dynamics of the Patagonia Shelf-Break Front

Evaluation of the sub-annual sea level anomalies in the continental shelf of the Southwestern Atlantic and their relation to wind variability

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