Lagrangian analysis of sea-ice dynamics in the Arctic Ocean

Szanyi, S.; Lukovich, Jennifer V.; Barber, David G.

doi:10.3402/polar.v35.30778

Cited by 7 publications

(16 citation statements)

References 36 publications

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“…Indeed, ignoring boundary effects, for a spherical particle that is completely immersed in the water τ = a 2 ρ/3µ, 19,26 while τ = a 2 ρ a /3µ a ≡ (ρ a /ργ) · (a 2 ρ/3µ) if the particle is fully (17), lim δ→∞ τ = 0. But this limit, as clarified above, is outside the domain of validity of the Maxey-Riley set (5) or its reduced form (12). It turns out that what really matters once the theory is confronted with observations is that (17) makes τ to decay at a faster rate with increasing δ than k = k a = 1, which corresponds to setting the projected length of the submerged (resp., emerged) particle piece to be equal to the submerged depth (resp., emerged height).…”

Section: Parameter Specificationmentioning

confidence: 97%

“…Examples of relevant aspects include clustering at the center of the subtropical gyres 18,19 , phenomenon supported on measurements of plastic debris concentration 7 and the analysis of undrogued drifter trajectories 18,19 , or the role of mesoscale eddies as attractors or repellers of inertial particles depending on the polarity of the eddies and the buoyancy of the particles 19,27,28 despite the Lagrangian resilience of their boundaries [48][49][50][51] , which is also backed on observations 52 . The cited phenomena, which act on quite different timescales, all require both O(1) and O(τ ) terms in (12) for their description 18,19,27,28 consistent with the slow manifold M τ in (14), rather than the critical M 0 , controlling the time-asymptotic dynamics of the τ → 0 limit of the Maxey-Riley set (5).…”

Section: Clarification Of the Maxey-riley Setmentioning

confidence: 99%

“…An important aspect that these simulations, in progress at the time of writing, will account for is the effect of the boundary on which the spherical cap rests on, which may lead to changes to the bounds on τ noted above. Table I presents our estimates for the parameters that characterize the special drifters as inertial particles evolving according to the Maxey-Riley set, in its full (5) or reduced (12) version. These are classified into primary parameters (a, K, and δ) and secondary parameters (α, R, and τ ), which derive from the primary parameters.…”

Section: Parameter Specificationmentioning

confidence: 99%

“…The assessment of motions of floating matter in the ocean is of importance for a number of key reasons. These range from improving search-and-rescue operations at sea 1,2 ; to better understanding the drift of flotsam of different nature including macroalgae such as Sargassum [3][4][5] , plastic litter 6,7 , airplane wreckage 8,9 , tsunami debris 10,11 , sea-ice pieces 12 , larvae 13,14 , and oil 15,16 ; to better interpreting "Lagrangian" observations in the ocean 17,18 . At present, largely piecemeal, ad-hoc approaches are taken to simulate the effects of ocean currents and winds on the drift of floating objects.…”

Section: Introductionmentioning

confidence: 99%

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Observation and quantification of inertial effects on the drift of floating objects at the ocean surface

et al. 2020

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We present results from an experiment designed to better understand the mechanism by which ocean currents and winds control flotsam drift. The experiment consisted in deploying in the Florida Current and subsequently satellite tracking specially designed drifting buoys of varied sizes, buoyancies, and shapes. We explain the differences in the trajectories described by the special drifters as a result of their inertia, primarily buoyancy, which constrains the ability of the drifters to adapt their velocities to instantaneous changes in the ocean current and wind that define the carrying flow field. Our explanation of the observed behavior follows from the application of a recently proposed Maxey-Riley theory for the motion of finite-size particles floating at the surface ocean. The nature of the carrying flow and the domain of validity of the theory are clarified, and a closure proposal is made to fully determine its parameters in terms of the carrying fluid system properties and inertial particle characteristics.

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Section: Parameter Specificationmentioning

confidence: 97%

Section: Clarification Of the Maxey-riley Setmentioning

confidence: 99%

Section: Parameter Specificationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Observation and quantification of inertial effects on the drift of floating objects at the ocean surface

et al. 2020

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“…Understanding these dynamics is especially important in the context of future trends towards thinner sea ice and ice-free summers, and changes in the extent of ice-free areas, ice movement patterns in polar regions and resulting changes in ocean circulation transport. Changes caused by the shift from multiyear ice extent to first-year ice might result in the tendency of sea ice floes to diverge from the main drift pattern such as the Transpolar Drift (Szanyi et al 2016), with complex effects on exchange processes of any contaminants between the Exclusive Economic Zones of the various Arctic nations (Newton et al 2017). 4.10.…”

Section: Ice Formation Melting and Driftmentioning

confidence: 99%

The physical oceanography of the transport of floating marine debris

Sebille

Aliani

Law

et al. 2020

Environ. Res. Lett.

608

267

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Marine plastic debris floating on the ocean surface is a major environmental problem. However, its distribution in the ocean is poorly mapped, and most of the plastic waste estimated to have entered the ocean from land is unaccounted for. Better understanding of how plastic debris is transported from coastal and marine sources is crucial to quantify and close the global inventory of marine plastics, which in turn represents critical information for mitigation or policy strategies. At the same time, plastic is a unique tracer that provides an opportunity to learn more about the physics and dynamics of our ocean across multiple scales, from the Ekman convergence in basin-scale gyres to individual waves in the surfzone. In this review, we comprehensively discuss what is known about the different processes that govern the transport of floating marine plastic debris in both the open ocean and the coastal zones, based on the published literature and referring to insights from neighbouring fields such as oil spill dispersion, marine safety recovery, plankton connectivity, and others. We discuss how measurements of marine plastics (both in situ and in the laboratory), remote sensing, and numerical simulations can elucidate these processes and their interactions across spatio-temporal scales. Environ. Res. Lett. 15 (2020) 023003 E van Sebille et al Environ. Res. Lett. 15 (2020) 023003 E van Sebille et al References Acha E M, Mianzan H W, Iribarne O, Gagliardini D A, Lasta C and Daleo P 2003 The role of the Rı́o de la Plata bottom salinity front in accumulating debris Mar. Pollut. Bull. 46 197-202 Acha E M, Piola A, Iribarne O and Mianzan H 2015 Ecological Processes at Marine Fronts: Oases in the Ocean (Berlin: Springer) Aliani S and Molcard A 2003 Hitch-hiking on floating marine debris: macrobenthic species in the Western Mediterranean Sea Hydrobiologia 503 59-67 Allen J 1985 Principles of Physical Sedimentology (Berlin: Springer) Alpers W 1985 Theory of radar imaging of internal waves Nature 314 245-7 Alsina J M and Cáceres I 2011 Sediment suspension events in the inner surf and swash zone. Measurements in large-scale and high-energy wave conditions Coast. Eng. 58

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Arctic sea ice is an important temporal sink and means of transport for microplastic

et al. 2018

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Microplastics (MP) are recognized as a growing environmental hazard and have been identified as far as the remote Polar Regions, with particularly high concentrations of microplastics in sea ice. Little is known regarding the horizontal variability of MP within sea ice and how the underlying water body affects MP composition during sea ice growth. Here we show that sea ice MP has no uniform polymer composition and that, depending on the growth region and drift paths of the sea ice, unique MP patterns can be observed in different sea ice horizons. Thus even in remote regions such as the Arctic Ocean, certain MP indicate the presence of localized sources. Increasing exploitation of Arctic resources will likely lead to a higher MP load in the Arctic sea ice and will enhance the release of MP in the areas of strong seasonal sea ice melt and the outflow gateways.

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Lagrangian analysis of sea-ice dynamics in the Arctic Ocean

Cited by 7 publications

References 36 publications

Observation and quantification of inertial effects on the drift of floating objects at the ocean surface

Observation and quantification of inertial effects on the drift of floating objects at the ocean surface

The physical oceanography of the transport of floating marine debris

Arctic sea ice is an important temporal sink and means of transport for microplastic

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