Inertia-induced accumulation of flotsam in the subtropical gyres

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Recent surveys of marine plastic debris density have revealed high levels in the center of the subtropical gyres. Earlier studies have argued that the formation of great garbage patches is due to Ekman convergence in such regions. In this work we report a tendency so far overlooked of drogued and undrogued drifters to accumulate distinctly over the subtropical gyres, with undrogued drifters accumulating in the same areas where plastic debris accumulate. We show that the observed accumulation is too fast for Ekman convergence to explain it. We demonstrate that the accumulation is controlled by finite-size and buoyancy (i.e., inertial) effects on undrogued drifter motion subjected to ocean current and wind drags. We infer that the motion of flotsam in general is constrained by similar effects. This is done by using a newly proposed Maxey-Riley equation which models the submerged (surfaced) drifter portion as a sphere of the fractional volume that is submerged (surfaced).

Original languageEnglish (US)
Pages (from-to)12,228-12,233
JournalGeophysical Research Letters
Volume43
Issue number23
DOIs
StatePublished - Dec 16 2016

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gyres
drifter
debris
inertia
plastics
garbage
ocean currents
buoyancy
drag
tendencies
plastic

Keywords

  • drifter
  • drogue
  • flotsam
  • garbage
  • inertia
  • patch

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

Cite this

Inertia-induced accumulation of flotsam in the subtropical gyres. / Beron-Vera, Francisco J; Olascoaga, Maria J; Lumpkin, R.

In: Geophysical Research Letters, Vol. 43, No. 23, 16.12.2016, p. 12,228-12,233.

Research output: Contribution to journalArticle

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